ZOOLOGY. CCxlv 
Testa ovali-elliptica, convexa, virescens, antice obsolete costostriata, pos- 
tic^ rotundata laevigata. 
Mytilus discors. Chemn., viij. 193. t. 86. f. 764. a. b. 
Modiola laevigata. Grai/, ut supra. 
Shell, oval, elliptical, convex, ventricose, front with a few obsolete ribbed- 
striae; middle and hinder part smooth, end rounded; epidermis, brownish 
or yellowish green ; length one inch, depth 3-8ths, breadtli one half of an 
inch. 
Variety 3. — Subsiriata, shell more oblong, hinder portion very closely 
obsoletely striated. 
Two odd worn valves of this variety, which, on further examination, 
may probably be considered as a distinct species, were brought home by 
this expedition. 
Order. — Micropoda. 
Family. — Pectenida;. 
Genus. — Pecten. Lam. 
Species. — P. ritreus. 
Testa orbicularis, tenuis, hyalina, planulatalaevissima, lucida, subequivalvis ; 
auriculis subequalibus laevibus. 
Pecten vitreus. Gray, ut supra. 
Shell, orbicular, thin, hyaline, quite smooth, glossy; valves, right, flattish, 
ears, front slightly dilated, rounded, tender, obliquely truncated ; left, rather 
convex; ears equal, obliquely truncated; margin even; length and depth 
one inch, breadth l-4th. 
Animal, mantle lobes, separate ; edge, fringed ; foot, ovate, thick. Tracheae 
none. 
Class. — Spirobrachiophora. 
Family. — Terebratulid^. 
Genus. — Terebratula. Lam. 
Species — T. psittacea. Lin. List. Conch., t. 211., f. 46. 
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