26 DR. p. p. CARPENTER ON THE SHELLS OF PANAMA. 



d contains parts of six specimens, and perhaps should be a, no. 400. 

 They appear to be a variety oi Lithophagus cinnamomeus, M. 177, 

 but with broken shells, &c., agglutinized on the posterior side. /(I) 

 contains four specimens of M. multiformis, the semigreenish variety 

 (Maz. Cat. p. 119), and are probably intended fore. /(2) contains 

 two specimens of the same variety of M. multiJorm.is, in the burrow 

 of a Lithophagus, and may stand for d or e. 



405. Cham.a huddiana=^ C. Q.frondosa, \a.x.)fornicata, M. 121, 6. 

 Additional specimens confirm me in regarding this species as distinct 

 from all varieties oi frondosa. The Professor's shells not being very 

 characteristic, the diagnoses do not exactly accord. The shell stands 

 as C. buddiana. 



406. Chama ? corrugata. The large valve appears a dead reversed 

 C (frondosa) mexicana, M. 121, with the teeth perforated by TA- 

 thophagi. The other may be corrugata, very dead, of sienna-tint, 

 very pointed dorsally. 



407. Chama echinata. These appear to me to be the young, partly 

 of O. buddiana, but principally of C. mexicana. 



408. Nucula elenensis=-Leda e., M. 199. 



409. Nucula exigua, M. 198. 



410. Nucula polita==-Leda p. With semidiagonal lines. 



411. Pectuncidus assimilis+P. intequalis, M. 196. 



412. Peetunculus Imaculatus. Stet. 



413. Area alt ernata^ Barb atia a., M. 188. 



414. Area laviculoides appears a young Scapharca. 



415. Area emarginata=^ Scapharca e., M. 187. 



416. Area gradata=Barbatia g.,l&.. 194. 



417. Area grandis, M. 180. 



418. Area mutabilis^:= Byssoarca m., M. 190. 



419. Area (Byssoarea) pholadiformis. This is simply an elon- 

 gated form of Barbatia gradata, probably from growing in the hole 

 of a Lithophagus. The umbos are " flattened " by erosion ; teeth 

 not "obsolete" under the glass; "ligament concealed" simply by 

 the compressed and elongated growth. 



420. Area reeviana= Barbatia r. 



421. Area reversa= Noetia r., M. 185. 



422. Area similis. This is scarcely a variety of A. tuberculosa, 

 M. 184. The specimens are dead and oiled, witii most of the epi- 

 dermis abraded. 



423. A?-ca solida= Barbatia s., M. 195. 



424. Ai-ca (Byssoarca) tobagensis= Barbatia illota, M. 193. 

 42.5. Area tuberculosa, M. 184. 



426. Area, sp. ind. a. These little shells approach the Noetia 



200 



