Bulletin, Issue 100, Volume 3

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Smithsonian Institution Press, 1919 - Science
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Page 363 - ... granuliform pedicellariae; no spines; actinal intermediate plates sharply marked off by sutural grooves and covered with a close mosaic of unequal, smooth, very compact granules; the 3 chevrons nearest furrow with an odd interradial plate, the others without; furrow comb compact, perpendicular, with 8 to 11 slender spines, the aboral end of 1 comb slightly overlapping the adoral end of the next younger comb. Description. — No spines on any plates except the adambulacral. Abactinal surface,...
Page 410 - ... group of spinelets. In the radial area the slight hollow is on the adcentral border. Inferomarginal plates with a conspicuous tapered spine surrounded by smaller spinelets. Actinal intermediate plates with a group (not a comb) of 2 to 4, mostly 3, basally webbed spinelets. Furrow spines usually 6, webbed for about half their length, the 3 or 4 median conspicuously larger than the laterals : subambulacral spines usually 4, the 2 median much longer than the laterals (in the cotype there are 5 or...
Page 294 - Fisher. Diagnosis. — Stellate, with a large disk and relatively short rays. Related to Plinthaster Verrill, but differing in having the surface of the abactinal plates perfectly smooth, not covered with minute bosses, in having the plates of the papular areas low-tabulate, and the adambulacral plates with an angular furrow margin armed with numerous short stubby spinelets; no conspicuously enlarged subambulacral spine on distal part of ray. Abactinal and marginal plates bordered by a single series...
Page 400 - FISHEB, 191oe, p. 216. Type, T. tenuis Fisher. Diagnosis. — Rays slender, disk small; dorsolateral plates 4-lobed, imbricated in regular transverse and longitudinal series; plates of median radial region mostly 3-lobed, irregularly imbricated, marginal plates actinal in position, separated from adambulacrals over most of ray by a single series of actinal intermediate plates, and on disk by small plates in transverse series; actinal interradial areas small ; papulae single in the small interspaces...
Page 85 - I paxillae; in lacking a special spine on the distal superomarginals; in having very sharp, flattened inferomarginal spinelets, and proximally several spinules along the aboral edge of the inferomarginal plates ventral to the lateral spines; in having the median furrow spine conspicuously flattened, not cylindrical; in having proximally adambulacral pedicellariae. Disk small, rays long and slender. R=108 mm., r=10 mm., R=10.8 r; breadth of ray at base, 11 mm. A smaller specimen, hawever, measures...
Page 202 - ... except on outer part of ray, where there are 2 ; 11 to 13 oral, and 1 prominent suboral spine. Papularia small, with about 25 pores, which do not reach farther than opposite middle of third superomarginal. Pectinate pedicellariae on the abactinal surface, between the proximal superomarginals, over the intermarginal suture, on the actinal intermediate plates; fasciculate pedicellariae on the actinal surface of inferomarginals. Related to Ch. snyderi.
Page 217 - Fisher, as well as the M. cognatus of Sladen, which appears to be generically distinct. The abactinal skeleton of Mimaster is strongly astropectinoid, the plates being typical penicillate paxillae, but the marginals, while perhaps neutral, remind one strongly of the marginals of Cycethra, i resemblance heightened by the actinal and adambulacral armature, which is decidedly ganeriid.
Page 127 - Type.— Cat. No. 30525, USNM Type-locality. — Station 5424, Sulu Sea, near Cagayanes Islands, 340 fathoms, coral sand, bottom temperature 50.4 F. ; 1 specimen. Remarks. — This species is similar, also, to P. tenuis, but differs in the presence of the conspicuous though small superomarginal spine, the wider inferomarginals, the much less compressed first adambulacral plates, the longer and more numerous marginal mouth spines, the proximal subambulacrals in 2 series, and the specialized abactinal...
Page 516 - I understand the arrangements of spines correctly, the formula for insularum would be + 1, which numerically is the same as the most characteristic formula of mimica. B. bengalensis has 14 rays, a small disk, with the abactinal spinelets in tufts, 20 costae occupying basal ninth of the ray, and intercostal bands of pedicellariae equally salient with the ribs. The adambulacral formula is similar to that of mimica, but the minor adoral and aboral subambulacral spines are not half as long as their plate,...
Page 3 - Director of the Hopkins Marine Station of Stanford University and Curator of Invertebrate Zoology, California Academy of Sciences. PREFACE. The following report is based upon an extensive collection of sea stars made by the United States Fisheries steamer Albatross between December, 1907, and December, 1910, in the region of the Philippine Islands, Celebes, and Molucca Islands. The Philippine cruise of the Albatross was under the supervision of Dr. Hugh M. Smith, then deputy commissioner, now commissioner,...

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