494, MAZATLAN UNIVALVES 
finely cancellated: also an extremely young shell, of similar 
sculpture, which may possibly be conspecific. 
Hab.—Mazatlan ; extremely rare, off Spondylus; LZ’pool Col. 
620. ? Metura ————, x. s. (b) 
Tablet 2363 contains a young shell with 3 smooth, nuclear, 
and two normal whirls; also a fragment of an older one; less 
acuminate than the last species, with stronger sculpture, 
more swollen whirls, and of a brownish colour. 
Hab.—Mazatlan ; portions of 7 sp. off Spondylus ; Z’pool Col. 
621 ? MeruLa ————-, sp. ind. (ec) 
Tablet 2364 contains a very young shell and fragments, 
belonging to a species with strong undulating ribs like Pisania, 
and well marked spiral strie. 
Hab.—Mazatlan ; extremely rare, off Spondylus ; L’pool Col. 
622. ? Metuta ————, sp. ind. (d.) 
Tablet 2365 contains a minute shell, of Metuloid shape and 
sculpture, with four nuclear whirls remarkable for their closely 
and minutely shagreened surface. 
Hab.—Mazatlan ; 1 sp. off Spondylus: L’pool Col. 
Sus-Famitry NASSINA. 
Genus NASSA, Lam. 
Only one species in this genus was found in abundance : 
another was not uncommon ; the rest were extremely rare or 
only fragmentary. 
623. Nassa LuTEostoma, Brod. & Sow. 
Zool. Journ. vol. iv. p. 376, 1829.—Rve. Elem. Conch. pl. 3. 
f. 11.— Mike. in Zeit. f. Mal. 1850, p. 179, no. 44.—C. B. Ad. 
Pan. Shells, p. 62, no. 48. 
