Figures and descriptions of Canadian organic remains: Decade I-IV.

Front Cover
Printed by J. Lovell, 1859 - Paleontology
0 Reviews

What people are saying - Write a review

We haven't found any reviews in the usual places.

Other editions - View all

Common terms and phrases

Popular passages

Page 3 - Report of Progress of the Geological Survey of Canada for 1874-75." Dr. Ells, also, in the "Report of Progress...
Page 59 - Description. — The body of this species, judging from the fragments in the collection, is about two inches in length and three-fourths of an inch in diameter. The character of its surface is such that detached plates may be distinguished at a glance from those of either of the two preceding species, being larger, thicker and more profusely ornamented. When perfect, these plates are somewhat convex, and covered with radiating ridges which are crossed at right angles by coarse striae.
Page 76 - Pentagonal, depressed, the arms a little produced, with three or five principal rows of tubercles above, combined with a plated disk which fills up the angles; ambulacra rather shallow, of subquadrate or slightly transverse ossicles, bordered by a single row of squarish large plates, the lowest of which (ad-oral adambulacral plates, Huxley; angle-ossicula, Forbes) are large and triangular, bearing combs of spines (Upper Silurian).
Page 79 - ... dimension is transverse, or at right angles to the groove ; the extremities which lie next to the grooves are angular, and some of them appear to have the contiguous pores partly excavated in them. The oral plates are acutely triangular, the sharpest angle being towards the mouth. The plates are smooth. The ambulacral pores are very large, and the ossicles are much contracted in the middle, and greatly expanded along the median line of the bottom of the groove.
Page 77 - Two inches in diameter, rays five, acute at their apices and rapidly enlarging to a breadth of four lines at the disc, which is eight lines in width. The specimen shews the upper side of the fossil only ; some of the plates are absent from the centre of the disc, but those which remain are very prominent in their centres and roughly ornamented by four or five deep crenulations or furrows from near the centre to the edges, producing a star-like appearance resembling a half-worn plate of Glyptoerinus...
Page 80 - Description. — This species has much the aspect of an Astropecten ; the disc is one fourth the whole diameter, the rays rather slender, and uniformly tapering ; the angles between the bases of the rays rounded. The plates, which appear to be adambulacral, are quadrate and a little convex ; the marginal plates oblong, and also convex ; the disc-plates consist of three at each angle, and a single row on each side of the ray, but extending only one third or one half of the length of the ray ; they...
Page 81 - In the view of the enlarged specimen (pl. x. 36), the ambulacral ossicles appear in some places to alternate with each other, but this is owing to a distortion. Those on one side of the furrow are opposite those upon the other. The adambulacral plates are elongated, and so placed that the outer extremity of the one lies upon the inner extremity of the next. The rays are flexible. Locality and Formation.—Falls of Montmorency, Trenton Limestone, collected by Dr. Billings. Taniaster cylindricus, Billings....
Page 80 - Body deeply stellate; no disk [there is a disk] or marginal plates; rays long, slender, flexible, and covered with small spines; two rows of large ambulacral pores; adambulacral plates elongated and sloping outward so that they partly overlap each other ; ambulacral ossicles contracted in the middle, dilated at each end. Generic name from tainia, a riband.
Page 136 - Generic characters.—Frond consisting of flabelliform or funnel-shaped expansions, (circular from compression) composed of slender radiating branches, which frequently bifurcate as they recede from the base ; branches and subdivisions united laterally by fine transverse dissepiments; exterior of branches strongly striated and often deeply indented; inner surface celluliferous or serrate, as in Graptolithus...
Page 83 - ... centre of the furrow ; there are about ten of these plates to five lines in length, on each side of the ambulacrum. The pores pass between the plates, one being situated between each two. The ambulacra are three lines wide at the mouth, and about an inch and a-half in length in full grown specimens. As they recede from the centre they curve round towards the right in some specimens, and towards the left in others. The mouth appears to be composed of ten plates ; five of these are at the ends...

Bibliographic information