DR. P. P. CARPENTER ON THE SHELLS OF PANAMA. 3 



10. Ciiprcea rafJia)is=Trii-ia r., M. -140. 



1 1. Cijprcta ruheiice)is'=^i\vaf\ sp. of Trivia sanguinea, M. 4-12. 



12. Cijpreea smiyuinea=Tiifia s., M. 442. 



13. Eroto srahriusrvld. Sttt. 



14. Marginella minor. Stet, M. .58". 



] .T. Maryitiella sapofi/la. 'I'he Panama specimens collected by 

 Prof. Adams, and alnmdantly l>y others, more closely resemble M. 

 Ijruimm than tlie type 37. sn]:otilla of Hinds, which is a much smaller 

 shtli. The Caribbean shells (which are tciuiid across the Isthmus 

 at Aspinwall) differ oirly in having a sharper angle in the labrum at 

 the posterior notch. Adansoii's habitat, donbted by Prof. Adams 

 (note, p. 41), is confirmed by sjieciniens in the Bristol Institution 

 brought from Sierra Leone by Chi' f. justice Hankiuc. The Pacific 

 shells are probably conspecific, suthcient evidence being now in our 

 possession that the two oceans were united at least as late as the 

 Aliocene epoch*. 



16. Mitra funicidata. Stet. 



17. Mitra lens, M. .58.5, 



IH. Mifra mtclenla. Closely resembling young sjiecimens of the 

 Caribbean M. gramilnsa. 



19. Mitra soJifaria, C. B. AA.-=Zierlianu s. Other specimens 

 have since been found of this characteristic species. The " trans- 

 verse ribs" can scarcely be said to be "obsolete anteriorly." 



20. Mitra tristis — SfrigateUa t., M. 586. 



21. Terehra elata = MiinreIla e. 



22. Tereljra farveeformis = Mi/urel/a I. 



23. 24. Stent. 



2.5. Terehra ti(berculosa^= MijureJln t. 



20. Terehra varicosa. This may possibly be a very young speci- 

 men of Suhuld V. ; but I think it distinct. 



27-31. Sp. ind. A specimen oi Eurijta fuUjvrnfa, M. 4 5.5, is in 

 the museum, as from Panama, but not of Prof. Adams's collecting. 



32. Olica angulata, M. .590. 



* The specimens in the Cnmingian Museum, named M. cterulencmii at the time 

 of the British Assoc'ation Report, are now lahelled " impniilla, H(is., .'J-13 fathoms 

 sandy mud, Panama, H. C." Another set of Pacific siielli. (notcli-angle rounded) 

 are given as " Marginella n. s., Panama," " San Domingo" having been erased. 

 The larpe West Indian form (notch-angle sharp) is given as " cterulescena, var., 

 Lam., 10 fathoms sandy mud, Panama " Another set of large shells, with sharp 

 angle, and lahrnm tinted behind, is given as " cierulescerm, Lara., Panama," but 

 wthout authority. The small West-Indian form (like the typical sapotUla) is 

 given as " ylans, Mke." Either in this, as in other instances, error has crept into 

 tiie iocality-marks, or else even the distinction pointed out by Mr. Redfield (who 

 hts given peculiar study to this genus) cauuut be reiica ou tor sc^aiuiing the spe- 



I'l » i;.n,'Sr;iphi ally, 



12 177 ^ 



