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



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

 very narrow, truncated. 



42". Cardita affinis. (Lazaria.} 



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 lamathusia Anomalocardia subimbricata, M. 113. 



436. Venus discors= Tapes grains, Say, M. 1 1 0. The Professor's 

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

 mixed. 



437. Venus gnidia, M. 101. Dead specimens ; of which one may 

 possibly be Chione amathusia, M. 102. 



438. Venus multicostata. Closely resembling the West Indian 

 form. 



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



440. Venus subrugosa=Anomalocardia s. t M. 112. 



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

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

 nute concentric striae. 



442. Venus, sp. ind. 6= Chione crenifera, M. 105=F. sugillata, 

 Rve. C. I. no. 43. 



443. Cytherea affinis. Probably = Callista concinna, var., M. 99. 



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



445. Cytherea consanguine a^= Callista c. 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 chioncea, M. 93. 



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



449. Artemis saccata=Cyclina subquadrata, M. 91. 



450. Gouldia pacifica, M. 116. 



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

 tubes, containing a very young " ? Cyclas " and another " Cyrena t 

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



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



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