MAZATLAN BIVALVES 93 
126. Carpium ?PsENntTIcosuM, Sow. 
Proc. Zool. Soc. 1833, p. 84.—Mill. Syn. Test. Viv. p. 218.— 
Sow. Conch. Ill. no. 43, pl. 47, f. 10—Rve. Conch. Syst. pl. 74, 
f. 10:—Conch. Ic. Ind. Card. & Errata.—Hanl. Deser. Cat. 
p. 137.—B. M. Cat. D’ Orb. Moll. p.'74, no. 658.—C. B. Ad. 
Pan. Shells, p. 268, no. 434. 
=Cardium rastrum, Rve. Conch. Ic. pl. 16, f. 82.* 
P=Cardium muricatum, Menke in Zeit. f. Mal. 1847, p. 188, 
no. 50. 
Tablet 454 contains a nearly perfect minute valve and 6 frag- 
ments of larger shells, which probably belong to this species. 
The ribs are extremely close, about 40, and bearing traces of 
grains which are strongest on the anterior side. The smallest 
fragment has a fine line running down the interstices, which is 
probably an accidental variety, as I have a specimen of C. 
echinatum displaying the same structure. C. muricatum is 
the West Indian analogue. 
Hab.—St. Elena, in sandy mud, 6-12 fm. Cuming.—Ecuador ; 
St. Elena, D’ Orbigny.—Taboga; very rare; C. B. Adams, — 
? Mazatlan; extremely rare, in shell washings ; L’pool Col. 
127. CaRDIUM — sp. ind. (a.) 
C.t. 2jun. minima, orbiculari, costis circiter xl. approxima- 
tis, haud extantibus, graniferis; superficie totd minutis- 
sime quasi arenatd, dentibus lateralibus haud magnis. 
Two valves anda fragment only were found of this shell, 
differing from C. punctulatum, Brod. & Sow., Zool. Journ. 
vol. iv. p. 366, in the characters above named. The entire 
surface appears as though dusted over with grains of sand. 
It appears to be a young shell: if the adult, when found, have 
the same characters, it may take the name of C. arenatum. 
Long. 08, lat. 08, alt. “06, 
Hab.—Mazatlan ; from Spondylus washings ; extremely rare ; 
‘pool Col. 
Tablet 455 contains a nearly perfect valve. 
- 
* “Mr. Reeve’s reference to P. Z. S. 1841 for Sowerby’s description is evidently 
a misprint for 1833; and the reference to the same work, 1845, for C. rastrum 
seems erroneous. Mr. Hanley’s reference to Reeve Conch, Syst. pl. 84 is also q 
misprint for 74.” (C. B, Adams, loe. cit, 
