DR. P. P. Carpenter on the shells of Panama. II 



192. MfiiiijpHa sulcond is the true Columbella a of Sbv. 



1!).'5. Cerithinin (t(liistitin = C. maculosum, M. 381. 



194. Cerithinin assiinilatuin=Ci'rithi()psis a., M- 563. , 



1 !).'). Ci'fifhiiini fiimarifiiiatuin = Cerifhioi)'^iii h. A gooil species ; 

 but I could not detect tlie " iiitiriiiediate raised line." Tlie apical 

 whorls are almost smootli. The "prominent s[)iral fold" on the 

 coiuiiu'Ua is simply that vviiicli bounds the recurved canal. 



l!Hi. Cerithinin faineHfiiin. Confusion has arisen from the Pro- 

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

 answer to the dia<;nosis, and which is descrilied as(.' var.) mcdioloice, 

 M. 3S:,'. Ten specimens are retained in the Amherst Museum, of 

 which cijiht are of the nnciiinfiiin type, =M. 383, and two of the 

 Cuminirian. C. unci /i at inn, beinu; an old species, is proi)idjly from 

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

 fuineliciim 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 coiitirnied in the belief that the Cumiugian shell is a distinct 

 species, which must stand as C. mc(lioJ<Kve. 



1!>7. Cerithiiim yeiiunntiiiii=^ Rhiiioclavis ffemmatns, M. 3S9. So 

 much confusion has arisen from raising specific names to the generic 

 peerage, that whenever a good di>tinct name has been given, it ap- 

 })ears best to retain it — the unbending rule of mere priority for work 

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

 standing. 



198. Cerithium } interrupt uin, C. B. Ad. (non ]\[ke. = M. 3S8). 

 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, highly 

 sculptured forms of the true interruptum as C. gulap<t(jinis, 



198 and 199 are regarded by Messrs. Cuming aud Soworby as 

 varieties of 



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

 Old. in Expl. Kxp.) = 6'. stercusmuscarum, M. 387. The aspect of 

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

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

 distinct. lie was, however, misled in affiliating the former to his 

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

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

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

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

 of the sjiecimens 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 pacijicuin. Stet. — - . ,^, . 



1S5 



