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



251. /?woc/, sp. iiid. This is a broken specimen of Chemnitaa 

 turrita, P. 230. 



2x2. 1 Ciiigula inconspicun. This unfortunate name, liable to be 

 cont'ounded with Ri^soa incnnnpicua, Alder, and IRitssoa incon.spicvn, 

 C. B. Ad., will not be needed, as the type belongs to another sub- 

 order, and =^ ChnjsdIUda oculuin, M. olJ. The Professor did not 

 observe its close relationship with his Chemnitzia communis. 



253. Cinyula paitpercula, C. B. Ad. A good species. 



2.')4. ICingnta terehelhim = Parfhenia exaruta, M. 501. Although 

 I took every pains, in preparing the Maz. C'at., to identify Prof, 

 Adams's specie;*, I was not prepared, in the writings of so careful a 

 naturalist who had devoted special attention to the minute species, 

 to find a Pyramidellid under Trochidae, es[iecially with the mark 

 " apex subacute." The finding of a more perfect .\Iazatlan specimen 

 enables me to add to the diagnosis: — *' vertice nuclfoso parvo, satis 

 extante, decliviter sitn; interstitiis carinarum transversim ruyulusis; 

 labro solidiore. Long. •087, long. spir. 057, lat. "Oob." 



255. 1 Cit)(/ula turrita ( + P. 249, Itisson n()fabiH>i) = Parfhpnia 

 quinquecincta, M. -498. When a shell is described under two genera 

 in the same sheet, the advocates of unbendiiig priority will find it 

 difhcult to decide. As each name belongs to a widely removed 

 family, that last giveu is at least the most correct and distinctive. 



25G. 1 Litiopa saxicola. The Professor states that this "shell 

 has the appearance of a Litiopa ;" but it wants both the peculiar 

 nucleus and the semitruncated columella ; Jilso that the " labium 

 has a distinct deposit," of which I could not see any trace in either 

 of the specimens. It is probably a t'ingula. 



257. 1 Adeorbis abjecta. This is the adult form of the shell, of 

 which P. 233, Littorina atrata, is the young. The strise are seen on 

 the lower as well as the "upper part of the whorls." The umbili- 

 cus, though "small" for an Adeorbis, is rather large for a Fossarus, 

 to which genus the species undoubtedly belongs. 



258. Vitrinella concinna. I could not find the " more or less 

 distinct ridge between the first two keels." 



259. Vitrinella exiffua = yi. 305. The omissions in the Pro- 

 fessor's diagnoses of this and other species, being supplied in the 

 Maz. Cat., need not be repeated here: v. M. pp. 236-247. 



2G0. Vitrinella j anus. The Professor does not mention the fifth 

 keel, which bounds the umbilicus, and within which are the " minute 

 spiral striae." The " transverse striae " are strong between keels 

 2, 3, and 4 ; faint between 4 and 5, and between 1 and 2 ; and eva- 

 nescent near the suture. . 



261. Vitrinella niinuta. The original type of this species accords 

 better with Ethalia than with Teinostoma, to which I had referred 

 the Cumiugian type. 



2G2. ViirincL'a modesta. The " modesty " of this unique shell is 



190 



