DR. P. P. CARPENTER ON THE SHELLS OF PANAVA. 31 



50!). CorhiiJa, sp. iud. h. Dead valves of C biradiafa. No. 503. 

 To the same species may be referred C pobjchroma. We were mis- 

 led by the different aj)pearaiice of the dead shell, and by the locality- 

 mark in Col. Jewett's collection. His specimens were probably from 

 Panama or Acapulco. 



510. Solcrtirfitft nffiiiin, M. 37. It is probable that this species 

 is identical with S. {J yovaculiua) curifjhatis. The Ariquibo s|)eci- 

 mens of the latter in Mus. Amherst are more like the Mazatlan shells 

 than those are to the Panama type. Shells from Cape Talmas were 

 affiliated to the Caribbtean species by Mr. Cuming. 



511. Solen r)idis=^EnsafeUa r. This interesting form passes 

 towards Pharella. It is called " Solena obliqua, Spengl., var." iu 

 Mus. Cuming. 



512. Pholus cruciyera. With the general aspect oi Barnea Candida. 



5 1 3. Photos tuhifera-=^ Pholadidea t. Of the melanura type, with 

 a solid tube titling on to the ends of the cups. 



514. Phulas xylophaija. Of the Martesia type, without cups. 

 Dorsal and ventral plates long; umbonal plates moderate ; wave of 

 the adolescent gape rather suddenly arched. 



515. Pholas , sp. ind. a. Col. Jewett's specimens of the 



same shell are named laquenta by Mr. Cuming. It is of the non- 

 waved, concameroid type; without radiating sculpture; concentric 

 lamelljfi beautifully frilled. 



516. Pholus, sp. ind. b. So like P. dactylus that it might be 

 taken for a worn valve from ballast. The sculpture-ridges are, how- 

 ever, further apart ; hinge-chambers larger and more numerous, with 

 a little twisted lamina beyond ; gape less conspicuous. 



517. Orbicula ciiminffii^^ Discina c, M. 14. 



The shells unfortunately are all loose, in trays, with the autograph 

 names on tickets. Prof. Adams's West Indian collections are in the 

 same condition ; and both series are arranged together, in zoological 

 order, in the midst of the general collec on. There is no evidence, 

 however, that they have been liandled since the Professor left them, 

 none of the leading conchological writers in the New World having 

 thought it needful to go out of their way to complete a review of the 

 Professor's work. Amherst is situated on a branch railway, and is 

 within an easy walk of Northampton, Mount Holyoak, and the deli- 

 cious sceuerv of the Connecticut River. In the College buildings 

 are also deposited the most complete series of the Fossil Footprints 

 of the Connecticut River, and the mineralogical collection (iucludiug 

 the meteorolites^ belonging to Prut, Shepherd. 



205 



