Proceedings of the Academy of Natural Sciences of Philadelphia, Volume 37

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Academy of Natural Sciences of Philadelphia, 1886 - Electronic journals
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"Publications of the Academy of Natural Sciences of Philadelphia": v. 53, 1901, p. 788-794.

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Page 432 - A Final Report on the Crustacea of Minnesota Included in the Orders Cladocera and Copepoda. Together with a Synopsis of the described Species in North America and Keys to the known Species of the more Important Genera.
Page 117 - Chloritic schists, frequently accompanied by epidote, abound in this series. The great predominance of magnesia in the forms of dolomite, magnesite, steatite, and serpentine, is also characteristic of portions of this series. The latter, which forms great beds (ophiolites), is marked by the almost constant presence of small portions of the oxides of chrome and nickel.
Page 8 - Junco hycmalis, in which he reported a multitude of worms filling the thoracico- abdominal cavity and extending into the neck and beneath the skin of the breast and abdomen. From the carcass seventy-two worms were obtained, of which two-thirds were females, ranging from 90 to 120 mm. in length ; the rest males, ranging from 40 to 55 mm. From the abdomen of another bird Dr. Warren obtained five worms, three females from 55 to 90 mm. and two males 40 and 55 mm. In twenty-two birds examined by Dr. Warren...
Page 378 - At a later period armor became generally adapted for defense, and the tooth became the most efficient weapon of attack. Still later, armor was discarded, and flight or concealment became the main method of escape, and swift pursuit the principle of attack, while claws were added to teeth as assailing weapons. Finally, mentality came into play, intelligence became the most efficient agent both in attack and defense, and a special development of the mind began. As a culmination of the whole, we have...
Page 437 - Description of an articulate of doubtful relationship from the Tertiary beds of Florissant, Colorado.
Page 251 - PI. xvi, figs. 3 b, 4, 5 and 7'6), are evidently of structural value, but as there is but one figured, although the description speaks of one to each plate, and this is located laterally in one specimen and centrally in the other, all interpretations by us must necessarily be more or less problematical. We are inclined, however, to believe that the lateral one (fig. 5), in analogy with Haplocrinus, represents the anal opening, te the larger tubercle in Granatocrinus, and the central one, if it exists...
Page 307 - Soc. Nat. Hist., vol. iv. 1881. W. and Sp. Revision ii, p. 184. 1883. W. and Sp. Amer. Journ. Sci., vol. xxv, p. 266. Xenocrinus is closely allied to Canistrocrinus, from which it differs in having four in place of five basals, and a quadrangular column. Generic Diagnosis. — Base monocyclic. Basals four, forming combined a shallow decagonal cup, which upon five of its sides supports the five radials, and alternately upon each of the five other sides a series of small interradial pieces. This arrangement...
Page 58 - In specimens from shallow water or alga*., the brown becomes nearly black and more extended, the belly and chin spotted with darker, and top of the head has no distinct markings. The deeper-water specimens are lighter in coloration than those from near the surface, and those from the coral reefs (var. beta, Goode & Bean) are paler than those from the green alga* and sea wrack ; otherwise no differences seem to exist.
Page 304 - Base monocyclic. Basals 3 to 5. Neither anal nor interradial plates touching the basals ; the latter in contact with radials only. Interradial areas composed of numerous plates ; those upon the dorsal side large, regularly arranged, those along the ventral surface frequently small and irregular. Oral plate generally surrounded by proximals. Anus subcentral. Column circular, rarely angular. E.
Page 76 - Head 3J. D. VII-11 ; A. 9. Head depressed, broader than high, flat above. Snout rather obtuse, longer than eye, lower jaw somewhat prominent ; cleft of mouth extending to below anterior margin of orbit. Teeth in upper jaw in a narrow band, the lower having 4 somewhat larger and recurved teeth in front, appearing to form a single sériée; palate toothlees. None of the tin rays prolonged; pectoral not quit...

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