500 MAZATLIN TTNIVALVE8 



635. Nassa , 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. 

 Sab. — Mazatlan ; extremely rare ; L'pool Col. 



636. Nassa , sp. ind. (h.) 



Tablet 2105 contains 2 fragments (perhaps not conspecific), 

 with 3 smooth nuclear whirls ; normal whirls flattened, crossed 

 by fine spiral strise. 

 Hah. — Mazatlan ; extremely rare ; L'pool Col. 



637. Nassa , sp. ind. (i.) 



Tablet 2408 contains a fragment of a very elevated species, 

 white, with the broad concave interstices of the sharp ribs 

 spirally striated. 

 Hob. — Mazatlan ; extremely rare, of£ Spondylus ; ISpool Col. 



Tablet 2407 contains an egg case, probably of a Nassa, off 

 Spond3*lus. — L'pool Col. 



Family PYUTJLID^. 



Genits PYRULA, Lam. 



Pyrula, Lam.. 1799, pars •.—Phil. Kandh. Conch, p. 141. 



Melongona, Sc/ium. 1817. 



Cassidulus (Humph.) G-ray, Proe. Zool. Soc. 1847, p. 136, 



no. 21 :— //. Sr A. Ad. Gen. vol. i. p. 81. 

 Galeodes, B'>1ten. 

 Semicassis, Martin, (teste Desk.) 

 Cyrtulus, sp. Hinds. 



638. Pykula patula, Brod Sf Sow. 



Zool. Journ. vol. iv. p. 377. — Zool. Beech. Toy. p. 115, pi. 34, 

 f. 10, jun., pi. 35, f. 3, jnn.. pi. 35. f. 1. adult. — Kien. Icon. 

 Conch, p. 14, no. 9, pi. 2, f. 1, 2.— Desk, in Lam. An. s. Vert. 



