Figures and Descriptions of Canadian Organic Remains Volume 3
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1858 edition. Excerpt: ...compensated by a corresponding enlargement of two of the plates of the fourth series, which are of so great a size that they extend from the top of the body down to the second series, and thus fill up the blank in the third series formed by the deficiency in the size of the two small plates mentioned (see pl. iii. fig. la). The whole of the upper half of the test presents very little of order in its structure, in consequence of this disproportion in.the size of the plates. The distribution of the pectinated rhombs is as follows: --On the anterior side there are two rhombs, a small one just below the mouth on the right side and a large one above, which extends from the mouth nearly to the apex (see pl. iii. fig. d). On the right side there are two; a small one near the apex and a large one below it, but still nearly altogether in the upper half of the fossil. Both of these are a little oblique, the large one with its upper extremity leaning forward, and the small one leaning backward (see pl. iii. fig. c). On the posterior or dorsal side there are four, two at the base, one-half of each being on the basal plate of this side, and the other half on the contiguous plate of the second series; a third very small rhomb is situated between the two small plates of the third series, and a fourth very large one is divided between the two large plates of the fourth series in the upper half of the fossil (see pl. iii. fig. F). On the left side there are five, a large one next the mouth, and at its upper angle another, which extends across the sides, sloping a little downwards, with a third which rises nearly perpendicularly from the posterior angle of the second one; below this there is a half-rhomb, and above the large one first mentioned in this..
- 189 x 246 x 2mm | 91g
- 13 Sep 2013
- United States
- black & white illustrations