DR. P. P. CARPENTER ON THE SHELLS OF PANAMA. ^O 



son'p "'•*' undoubtt'dlv C nivea ; others truly C. inujiiiformis ; and 

 others probably C. nivea, but with the riblets worn away by the 

 crabs. 



351. Crepidiiln nivea, M. 341. The specimens are small and 

 poor; mostly rough, of the variety striolatu passing into lessonii. 

 Wherever the apex is perfect, it presents the characteristic ril)lets, 

 but is generally white, not brown as in most of the finely grown 

 Mazatlan shells. 



Sr*2. Crepidula oscvlans. This is a perfect and extremely beau- 

 tiful specimen of Scutellina navicelloi'les, M. 269. The Professor 

 did not observe the non- spiral patelloid apex, and regarded the 

 " navicelloid " columella as an extremely narrow deck. To the diag- 

 nosis in the Maz. Cat. may now be added " apice obtuso, suUceci ; 

 vertice hand spirali, vix couspicuo." 



353. Crepidula rostrata=C. odmica, M. 338, ?non Shy. The 

 examination of a large series of si)ecimens from the temperate fauna 

 has led me unexpectedly to confirm Mr. Reeve's opinion tliat they 

 are distinct. The northern shell is C. adunca, Sby. {=(kmwtia 

 [Gray] solida, Hds.= C. rostriformis, Gld.) ; and the tropical shell 

 must take the prior name, C. uncatu, Mke. (=C. rostratu, C. B. Ad,, 

 Rve. = C. adunca, Maz. Cat., non Sby.). 



354. Fissurella (equalise Fissur el lidcea ce.. 



355. Fissurella alta = Glijphis alta, M. 280. 



356. Fissurella macrotrema. Stet. 



357. Fissurella microtrema. These are dead specimens, of which 

 some are F. rugosa, var., M. 273. 



358. Fissurella mus=Glyphis incequalis, var., M. 279. These 

 shells are intermediate between the typical form and pica. 



359. 360. Stent. 



361. Fissurella virescens. It is doubtful whether any of the spe- 

 cimens are of the true virescens, M. 271, as they rmi into niyro- 

 punctutu by insensible gradations. Perha])S both species may prove 

 identical. 



302. Siphonaria characteristica = S. giyas, var. 



363, 364, 305. Stent. 



306. Siphonaria 1 pica. These are young dead limpets (not 

 Sipkonarice). 



3G7. Lottia 1 patina, C. B. Ad. (non Esch.). These shells differ 

 from Jcmcea mesoleuca, M. 263, iu being black instead of green, and 

 are prettily striped. 



368, 369, 370. Lottia, sp. ind. There may be two or even more 

 species of Acmsea, but it is not impossible that there is only one 

 among the professor's Lottise, some of the specimens being the 

 young of ? Fatdla, no. 371. -iqw 



