The sides are rounded, without any appearance of serratures; thickened near the tip, and more compressed near the base. 20. Tooth of a squalus, something like that of _S. galeus_, but less of a triangular form, and the lateral processes are more distinct, and also less triangular than in that species. 21. An imperfect body of a crinoid animal, _encrinite_ of authors; the fragment is about one-half of the inferior portion of the body, from which the following description is made out, taking into view the whole circumference. The plates composing the _first costal_ series (Miller), five in number, are longitudinally pentangular, much curved inwards towards the base, to join the _first columnar joint_, or perhaps the _pelvis_; at which part the plate is narrow, being about one-ninth of an inch, whilst the other sides are nearly three-tenths of an inch each, the superior ones being somewhat longer than the others; the _second costal plates_, (Miller,) five in number, are transversely pentangular, the superior joint being long, the lateral ones shortest, the former being one-half an inch in length, the latter 3/20, and the inferior sides which articulate to the segments of the pelvis, somewhat less than 3/10 of an inch; the margins of the first costal joints, as well as the superior margins of the segments of the pelvis, are armed with a few tubercles, some of which seem to have been perforated; all the superior pieces are wanting in our specimen, but the truncated surface, on which the _scapulars_ (Miller) rested, is of a pentagonal outline, and composed of a series of horizontal equilateral triangles, two to each side, which are separated on each side from the adjacent pairs by a deep groove, which corresponds, and is nearly at right angles with the exterior sutures, which join the first costal joints to each other; these triangular surfaces are also separated from the exterior edge by two grooves, which are crenated, and enclose an oblong foramina between them; a single _intercostal plate_ occurs, interposed between two of the _second costals_; it is of an oblong hexagonal form, its base resting upon the extremity of a segment of the _first costals_, which is truncated to receive it; the superior portion of this plate is much bent inward towards the abdominal cavity; its tip is quadrate and concave. The whole exterior surface of this reliquium, with the exception of the tubercles, and sutural impressed lines, is plain and equable. If we have not mistaken the pieces of this imperfect specimen, the pelvis is wanting, but the cavity in which it existed must have been about 3/20 of an inch in diameter.