94, MAZATLAN BIVALVES 
128. CarpIumM ————-, sp. ind. (b.) 
Tablet 456 contains a fragment of a shell of moderate size, 
which may possibly be C. triangulatum, Sow. (St. Elena and 
Isle Plata, Cuming.) It has very broad flat ribs, with 2 rows 
of tubercles on each. These communicate with decussating 
lines in the interstices. 
Hab.—Mazatlan ; from shell washings ; L’pool Col. 
129. Carpi1um ———— sp. ind. (ce.) 
Tablet 457 contains a fragment of a moderate sized Cardium, 
having relationship with C. pseudofossile, Rve. (Behring’s Str.) 
It is of a dead white, with very close, stout, numerous, rounded 
ribs, barely nodulous. 
Hab.—Mazatlan ; from shell washings; L’pool Col. 
130. CarpIuM —— sp. ind. (d.) 
Tablet 458 contains a fragment of a thin white shell with 
perfectly triangular, rather distant ribs, with flat sides. The 
interstices are smooth, bounded by clearly marked lines. 
Hab.—Mazatlan: from shell washings; L’pool. Col. 
131. Carpium ————., sp. ind. (e.) 
Tablet 459 contains 2 fragments, something like the last, but 
coloured, and with the ribs rounded and slightly nodulous. 
Hab.—Mazatlan ; from shell washings ; L’pool Col. 
132. Carpilum ———— sp. ind. (f.) 
Tablet 460 contains 2 minute fragments, with very narrow 
smooth rounded ribs, very far apart. Interstices broad, smooth, 
bounded by distinct lines. 
Hab.—Mazatlan ; from shell washings ; L’pool Col. 
133. CARDIUM ALABASTRUM, %. s. 
C. t. parva, alba, nitidd, subdiaphand, subequilaterali, 
elongata ; costis circiter xvill., quarum quatuor ventrales 
magne, distantes, costellis utrdque subtrigonu- 
latis apicem versus granulatis ; interstituiis minutissime decus- 
