DR. p. p. CARrrNTER ON THE SHELLS OF PANAMA. 3 



10. Cypraa radians= Trivia ?•., M. 4J0. 



11. Cypreea rK6e«een«=dead sp. of Trivia sanguinea, M. 442. 



1 2. Cypraa sangmnea= Trivia s., M. 442. 



13. Erato scahriuscula. Stet. 



14. Marginella minor. Stet, M. 587. 



15. JSlarginella sapofilla. The Panama specimens collected by 

 Prof. Adams, and abundantly by others, more closely resemble M. 

 prvnum than the type M. sapotilla of Hinds, which is a much smaller 

 shell. The Caribbe.in shells (which are found across the Isthmus 

 at Aspinwall) differ only in having a sharper angle in the labrura at 

 the posterior notch. Adanson's habitat, doubted by Prof. Adams 

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

 brought from Sierra Leone by Chief .lustice Kankine. The Pacific 

 shells are probably conspecific, sufficient evidence being now in our 

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

 Miocene epoch*. 



16. Mifrafuniculata. Stet. 



17. Mitra lens, JM. 585. 



18. Mifra nucleola. Closely resembling young specimens of the 

 Caribbean M. granulosa. 



19. Mitra solitaria, CB. A&.=Zierliana 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 trislis = Sfrigatella t., M. 586. 



21. Terebra elata = MyureUa e. 



22. Terebra larvceJornds = Myurella I. 



23. 24. Stent. 



25. Terehra tuberculosa^ My urella t. 



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

 men of Subula V. ; but I thinlv it distinct. 



27-31. Sp. ind. A specimen oi Euryta fulgurata, M. 45,i, is in 

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



32. Oliva angulata, M. 590. 



* Thespecimens in the Cumingiati Museum, named M. cceruhscfms at the time 

 of the British Assoc'ation Report, are now lahelled " sapotilla, Hds., 5-13 fathoms 

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

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

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

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

 angle, and labrum tinted behind, is given as " ccerulescens, Lam., Panama," hue 

 without authority. The small West-Indian f(U'm (like the typical sapolilla) i& 

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

 the locality-marks, or else even the distinction pointpd out liy Mr. Pedfield (who 

 hfls given peculiar stu{ly to this genus) cauuut be relied ou ior seiiarating the spe- 

 o/s g.ii-'graphi'aliy. 



12 177 



