Contributions to Canadian Micro-palæontology, Parts 1-4 |
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ALFRED R. C. SELWYN Aparchites apertures Arisaig Beyrichia tuberculata Bryozoa carapace cells Chazy Cincinnati Cincinnati group Cincinnati Soc collected convex curved cystoid diaphragms Devonian diam diameter diaphragms Diplotrypa dorsal angles E. O. Ulrich Enlarged about fifteen enlarged about thirty Figure genus Geol Geological gonal H. M. Ami Hall Hay River height hinge-line Hisingeri Hist Hudson River interstitial Isochilina Jones Journ Lake Winnipegosis larger left valve Length Leperditia limestone lobe Longitudinal section Magn Manitoba mesopores millimetre monticules Monticulipora nearly Nicholson numerous oblique Ohio Ostracoda Ottawa Plate posterior Prasopora Ptilodictya Quart Quebec ridge right valve River or Cincinnati Schmidt section showing Silurian slightly smooth species specimens spiniform tubuli Stony Mountain straight sulcus surface T. C. Weston Tangential section Tetradium thickness Trenton Trenton Formation tubercles tubes tubos Tyrrell upper beds variety ventral ventral edge ventral margin vertical section walls Whiteavesi XLVI zoarium zoœcia
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Page 98 - Priinitia? * * * * with a central pit, and elegantly ornamented with narrow curved ridges and furrows (of about equal width). These are nearly straight, and somewhat inosculating on the dorsal, tortuous and interrupted on the ventral region. Small pits occur here and there along the furrows, as if marking obsolete meshes.
Page 41 - Minn., 1886,* as well, and it is not possible in the present state of our knowledge to say what changes would result from a monographical study of the genus.
Page 49 - Detached segments of this very pretty little bryozoan are abundantly strewn over the surface of some of the slabs from Stony Mountain, Manitoba, and I do not doubt that if searched for, specimens preserving a number of them joined together would be found there.
Page 49 - ... vertical striae; lower extremity bulbous, smooth; upper half celluliferous, expanding more or less rapidly, the depressed conical top varying in diameter from 0.7 to 2 mm. The apertures of the zocecia on the top are subcircular; about 0.09 FlG.
Page 97 - A small, left valve, suboblong, straight on the back, obliquely curved below, rounded at the ends, the posterior higher and fuller than the anterior. Two largish prominent knobs, oval in section and obliquely peaked, divide the dorsal region into three nearly equal portions ; the front tubercle is smaller than the other.
Page 79 - M" Acadian Geology"), has the anterior lobe divided, the middle lobe isolated and the posterior lobe and its pustules represented by a broad, subtriangular gigot with four small tubercles. This lobe is described (p. 157) as being broadly curved and forming a ridge " high] and angular, with a small prominent tubercle at the dorsal extremity, and from four to six smaller spine-like tubercles along its curve.
Page 57 - ... able to prove inaccuracies in their figures of the much better known species B. oculifera, Hall, and B. Chambersi, Miller. But he included Tetradella specimens from the Middle Ordovician Trenton group in T. quadrilirata, for he continued: This species is one of the most abundant of the Ostracoda of the upper beds of the Hudson River group, and it occurs at many localities in Ohio and Indiana. I have collected it also at High Bridge, Ky., where it occurs in the Birdseye limestone, and from the...
Page 49 - PORTION. RICHMOND GROUP, STONY MOUNTAIN, MANITOBA. (AFTER ULRICH.) mm. in diameter and arranged in radial series between raised lines about the large central socket. As the zoarium expands the series increase in number by interpolation. The apertures of the zocecia on the sides are ovate and a little larger, having an average length of 0.11 mm. Like those on the top, they are arranged between elevated granulose ridges.
Page 101 - Shell slender conical with prominent longitudinal ribs, and from eight to ten deep strictures. Length and -breadth of the joints gradually increasing, the eighth joint being twice as long and broad as the fourth joint. Pores regular, circular, one series in each longitudinal furrow, three to four pores in each joint. Dimensions : Length of the shell (with eight joints), Q-'2 mm. i' " fourth joint, O'O^ » .. " eighth ,• 0-04 Breath » fourth " 0-04 •• eighth " 0-08 .• Occurrence : frequent.
Page 29 - On Some Polyzoa (Bryozoa) and Ostracoda from the Cambro-Silurian Rocks of Manitoba; Geol.