498 MAZATLAN UNIVALVES 
Hab.—Mazatian ; 3 sp. and fragments ; L’pool Col. 
Tablet 2394 contains the middle sized sp. with its operculum 
in situ. 
626. Nassa ————, sp. ind. (a) 
Tablet 2595 contains fragments of a species resembling 
Nassa acuta, with less defined ribs, and undulating interspaces. 
Hab.—Mazatlan ; off Spondylus ; Z’pool Col. 
627. Nass ————, sp. ind. (b.) 
Tablet 2396 contains a young shell, white, resembling 
N. acuta, but with the whirls less inflated. 
Hab.—Mazatlan ; extremely rare, off Spondylus ; L’pool Col. 
628. Nass ~————, sp. ind. (c.) 
Tablet 2397 contains fragments of a species with rather 
flattened whirls; the ribs crossed by raised, sharply defined 
lirule, with deep interstices. 
Hab.—Mazatlan ; extremely rare, off Spondylus ; Z’pool Col. 
629. Nass ————, sp.‘ind. (d.) 
Tablet 2398 contains a young shell and a fragment of a 
globose species; nucleus tumid, large, of nearly four whirls ; 
normal whirls with sharp ribs, distant, crossed by rather close 
spiral strie. 
Hab.—Mazatlan ; extremely rare, off Spondylus ; Z’pool Col. 
630. Nassa ————, sp. ind. (e.) 
Tablet 2399 “contains a young sp. (imperfect) of a species 
resembling the last, but less swollen, brownish, with the ribs 
tumid. 
Hab.—Mazatlan ; extremely rare, off Spondylus ; L’pool Col. 
631. Nassa PGemMMutosa, C. B. Ad. 
Pan. Shells, pp. 61, 305, no. 46. 
(Nassa) Niotha gemmulosa, Hl. & A. Ad. Gen. i. ur. 
