DR. P. P. CARPENTER ON THE SHELLS OF PANAMA. 27 



type. Ribs fine, tuberculous, coarse on the angular side. Ligament 

 very narrow, truncated. 



427. Cardita affinis. (Lasaria.) 



428. Cardita laticostata=^Venericardia I, 



429. Cardita radiata. (Lazaria.) 



430. Cardium graniferum, M. 134. 



431. Cardium obovale^Hemicardia o. 



432. Cardium planicostatum, C. B. Ad., not Sby. This looks like 

 a dead ballast- valve of Hemicardia media ; but it may be H. bian- 

 gulata. 



433. Cardium procerum, M. 125. 



434. Cardium senticosuM, M. 126. 



435. Venus'Jamaikusia = Anomalocardia subimbricata, M^. 113. 



436. Venus discors— Tapes ffratus, Say, M. IIO. The Professor's 

 specimens of this species and T. histrionicus are somewhat inter- 

 mixed. 



437. Venus ffnidia, M.. lOl. Dead specimens ; of which one may 

 possibly be Chione amafhusia, M. 102. 



438. Venus multicostata. Closely resembling the "West Indian 

 form. 



439. Venus pectunculoides= Tapes histrionicus, M. 109. 



440. Venus subrugosa = Anomalocardia s., M^. 112. 



441. Venus, sp. ind. a. A small species with concentric laminse, 

 armed with one posterior row of blunt spines. Interstices with mi- 

 nute concentric striae. 



442. Venus, sp. ind. b:= Chione crenifera, M. 105=:F. sugillata, 

 Rve. C. I. no. 43. 



443. Cytherea affinis. Probably=(7aZ?z«<a conmna, var., M. 99. 



444. Cytherea aurantiaca=^ Callista aurantia, M. 92. 



445. Cytherea consangninea=. Callista e. Messrs. H. and A. 

 Adams have not made a subgenus to include this group of thin, in- 

 flated, almost colourless species. 



446. Cytherea radiata^^^Trigona r., M. 83. 



447. Cytherea squalida= Callista chioneea, M. 93. 



448. Artemis dunkeri^ Dosinia d., M. 90. 



449. Artemis saccata=^ Cyclina subguadrata, M. 91. 



450. Gouldia pacifica, M. 116, 



451. Cyrena maritima. Stet. The collection also contains two 

 tubes, containing a very young "ICyclas" and another "Cyrena, 

 jun.," marked "Panama, C. B. Ad." 



452. Lucina tellinoides=Felania t. Differs from F. sericata, 



201 



