PORPHYROBAPIIE. 149 



these figures, referring to Ferussac's plate ; and as a synonym he 

 quotes "Achatina adamsonii Gray! Gray, Sp. Z. fasc. 2, f. 4, 5." 

 No such species occurs in either the text or plates of our copy of 

 Gray's u Spicilegia Zoologica," which is evidently the work referred 

 to; but in the Proceedings of the Zoological Society for 1833, Gray 

 described a Bulinus adamsonii, which is a species of the subgenus 

 Metorthalicus. 



Fig. 64 represents Reeve's type. 



It is a species of the Upper Amazon region, and the localities 

 " Guiana " and " Pernambuco," cited by some authors, require con- 

 firmation. Ferussac gives *' Cayenne " as the locality. 



Genus PORPHYROBAPHE Shuttleworth, 1856. 



Porphyrobaphe (in part) SHUTTL., Notitiae Malacol. i, pp. 69, 70 

 (for adamsoni, iostoma, kelletii, latevittata, labeo, irrorata] VON 

 MARTENS in Albers, Die Hel. edit. 2, p. 227, type 0. iostomus Sow. 

 (1860); and of many recent authors BORUS, in part, of MORCH, 

 Catal. Yoldi, 1852, p. 27, and of H. & A. ADAMS, Gen. Rec. Moll, 

 ii, p. 148. 



Shell imperforate, ovate-conic, solid, with about 2J smooth apical 

 whorls ; aperture ovate, rather large, with the lip reflexed, expanded, 

 or merely blunt and somewhat thick. 



Jaw, dentition, central nervous system and genitalia (of P. iostoma) 

 similar to those of Oxystyla, except that the penis is shorter and the 

 spermatheca is larger with shorter duct. The penis bears a lobed 

 appendix as in Oxystyla. 



Type, B. ioftoma Sowb. Distribution, northwestern Peru, to 

 Colombia. 



The only difference of much importance between Porphyrobaphe 

 and Oxystyla is in the peristome, which is thick and blunt or reflexed 

 in the former, thin and acute in the latter group. This is hardly of 

 itself sufficient ground for generic separation ; but as the name has 

 already come into general use, and the soft anatomy may, when more 

 fully examined, show other differences, it is probably best to adopt 

 the group as of generic value. It differs from Orthalicus proper and 

 from Metorthalicus in the smooth, not pitted, embryonic shell. 



Key to Species of Porphyrobaphe. 

 [P. integer is not included in this table. J 



