500 MAZATLAN UNIVALVES 
635. Nass ————, sp. ind. (g.) 
Tablet 2404 contains a young shell and fragment (perhaps 
not conspecific) with flattened whirls, flattened ribs, and spiral 
decussations which do not cross the ribs. 
Hab.—Mazatlan ; extremely rare; L’pool Col. 
636. Nassa —--——, sp. ind. (h.) 
Tablet 2405 contains 2 fragments (perhaps not conspecific), 
with 3 smooth nuclear whirls ; normal whirls flattened, crossed 
by fine spiral strice. 
Hab.—Mazatlan ; extremely rare; L’pool Col. 
637. Nassa — , sp. ind. (2.) 
Tablet 2406 contains a fragment of avery elevated species, 
white, with the broad concave interstices of the sharp ribs 
spirally striated. 
Hab.—Mazatlan ; extremely rare, off Spondylus ; L’pool Col. 
—— 
Tablet 2407 contains an egg case, probably of a Nassa, off 
Spondylus.—L’pool Col. , 
Famity PYRULIDA. 
Genus PYRULA, Lam. 
Pyrula, Zam. 1799, pars :—Phil. Handb. Conch. p. 141. 
Melongena, Schum. 1817. 
Cassidulus (Humph.) Gray, Proc. Zool. Soc. 1847, p. 135, 
no. 21:—H. & A. Ad. Gen. vol. i. p. 81. 
Galeodes, Bolten. 
Semicassis, Martin, (teste Desh.) 
Cyrtulus, sp. Hinds. 
638. Pyruta patuLa, Brod & Sow. 
Zool. Journ. vol. iv. p. 377.—Zool. Beech. Voy. p. 115, pl. 34, 
f. 10, jun., pl. 35, f. 3, jun., pl. 35, f. 1. adult.— Aizen. Icon. 
Conch. p. 14, no. 9, pl. 2, f. 1, 2.—Desh. in Lam. An. s. Vert. 
