DR. P. P. CARPENTER ON THE SHELLS OF PANAMA, ll 



192. MangeJia sulcosu is the true Colambella s of Sby, 



193. Cerithium adustum = C. maculosum, M. 381. 



194. Cerithium assimilatum=Centhiopsis a., M, 563, , 



195. Cerilhiioii Ijimargiiiatum=^Cerithiopsis b, A good species; 

 but I could not detect the "intermediate raised line." The a[)ical 

 whorls are ahiiost smooth. The "prominent spiral fold" on the 

 columella is simply that which bounds the recurved canal. 



19(). Cerithium famelicum. Confusion has arisen from the Pio- 

 fessor having sent to Mr. Cuming as his type a shell which does not 

 answer to the diagnosis, and which is described as (? var.) medioUnoe, 

 M. 382. Ten specimens are retained in the Amherst Museum, of 

 which eight are of the unciiiatam type, =M. 383, and two of the 

 Cumingian. C. uncinatum, being an old species, is probably from 

 the Atlantic or E. Indies : if this should prove identical, the name 

 famelicum must be dropped ; if distinct, retained for the west coast 

 uncinoids, according to the diagnosis. After an examination of a 

 large series of specimens collected by Mr. Xantus at Cape St. Lucas, 

 I am confirmed in the belief that the Cumingian shell is a distinct 

 species, which must stand as C. mediol<sce. 



197. Cerithium gemmatum = Rhinoclavis yemmatus, M. 389. So 

 much confusion has arisen from raising specific names to the generic 

 peerage, that whenever a good distinct name has been given, it ap- 

 pears best to retain it — the unbending rule of mere priority for work 

 which is sometimes slovenly, and therefore best forgotten, notwith- 

 standing. 



198. Cerithium ? interruptum, C, B. Ad, (non Mke. = M. 388). 

 Great confusion has arisen from this erroneous determination, as 

 may be seen by comparing the Maz. Cat. in loco with the mono- 

 graph of Sowerby, jun., who has redescribed the southern, higlily 

 sculptured forms of the true interruptum as C. galapayinis. 



198 and 199 are regarded by Messrs, Cuming aud Sowerby as 

 varieties of 



200. Cerithium irroratum, C. B. Ad. (Gld. ipse et MSS., non 

 Gld. in Expl. Exp.)=:C stercusmuscarum, M. 387. The aspect of 

 the Panama shells is so different from that of the Muzatlau speci- 

 mens that I did not wonder at Dr. Gould's opinion that they were 

 distinct. He was, however, misled in aflftUating the former to his 

 C. irroratum, of which I fortunately discovered the figured type in 

 the Smithsonian Institution, and which proves to be (according to 

 Mr. Cuming) the C. ohesum of Sby, sen., from the Philippines, It 

 is fortunate therefore that the name may be entirely dropped. Some 

 of the specimens of no. 198 graduate sufficiently closely to the Ma- 

 zatlan form; those of no. 199 are intermediate; while those of 

 no. 200 present a stronger but smaller shell, well armed with small 

 uodules, which are not to be seen in the fine Gulf specimens. 



201. Cerithium neylectum=^ Cerithiopsis n. 



202. Cerithium pacijicum. Stet. 



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