36 PERRIERIA. 



Stenogyra striatissima GREDLER, Jahrb. D. Malak. Ges., ix, 

 p. 49, 1882. Opeas striatissa GREDL., Malak. Bl. (n. F.), ix, 

 p. 142 (1887). 



Of the shape and size of 8. fortunei Pfr., but closely and 

 deeply stria te, the whorls less numerous, with the exception 

 of the last two, more convex, etc. The intervals are not 

 wider than the striae. The generic position is uncertain. In 

 his later list, Gredler writes the name " striatissa Gredl. 

 (nicht 'striatissima')." 



Genus PERRIERIA Tapparone Canefri. 



See Man. Conch., vol. xvi, p. 189. 



At the time my monograph of this genus was prepared the 

 internal structure of the shell of Perrieria was unknown, and 

 no specimens were accessible to me. Mr. E. R. Sykes has re- 

 cently shown that there are no internal lamella? or plicae, and 

 the slender axis is strongly sinuous. He suggests that the 

 genus may belong to the Achatinidce. This change of family 

 position seems to be justified by our present knowledge ; and 

 pending an examination of the soft anatomy, I would place 

 Perrieria in the vicinity of Prosopeas or Tortaxis. the external 

 sculpture most resembling the former, the columella the latter 

 genus. Ccelocion, which I have examined, is certainly very 

 unlike Perrieria in internal structure. It is surely not Acha- 

 tinoid, and should remain, I believe, in the Megaspirida. 



P. CANEFRIANA Sykes. PI. 4, figs. 16, 17. 



"Shell sinistral, spire elongate and gradually tapering to- 

 wards the apex, truncate, uniform dark chestnut-brown in 

 color, somewhat polished; sculpture well marked lines of 

 growth; whorls remaining 7, plano-convex, regularly increas- 

 ing to the last whorl, very little, if at all, ascending in front ; 

 aperture somewhat piriform, dusky brown within, peristome 

 whitish, continuous, somewhat thickened, the outer margin 

 a little expanded, and the columella rather twisted and trun- 

 cate. Alt. 24.5, diam. max. 6.4; alt. apert. 7.3, diam. apert. 

 5 mm." (Sykes). 



Island of Obi. 



