268 ACHATINELLA C^ESIA. 



line. The lip has a delicate rib close to the edge, which is of 

 the same faintly pinkish white as the rest of the interior. 

 Columellar fold median, rather strong, and pale flesh color ; 

 columellar margin reflxed and closely adnate. Length 18.3, 

 diam. 10.3, aperture 8.5 mm. ; 614 whorls. 



Mr. Gulick recognized two varieties: "Var. b, white; var. 

 c, pale green." All of the specimens have the embryo as 

 described above. The dark sutural line of subsequent whorls 

 is never continued upon it as an ocher band, as it frequently 

 is in A. dimorpha. In one specimen of the white form there 

 is no dark sutural line, others having it. Gulick 's "green" 

 variety is more properly olive-ocher, or tints between that and 

 primrose yellow, always fading to nearly white near the chest- 

 nut sutural line. Often the penultimate whorl is colored 

 thus, the color fading out on the last whorl. Specimens of 

 these forms are figured, pi. 44, figs. 9 to 12. All from the 

 Gulick series, No. 92,224 A. N. S. Another shell which prob- 

 ably came from Newcomb, has a distinct yellow band below 

 the white peripheral band, a fainter yellow band above it. 

 The pattern of this shell reminds one of A. decipiens. 



I agree with Mr. Gulick that cognata is quite distinct from 

 dimorpha. It is also reported by him from Waikane, but I 

 have not seen these specimens. Both cognata and scitula are 

 imperforate. 



The type-specimen of A. scitula Gulick, pi. 43, fig. 11 (No. 

 61 of Gulick 's type series, Boston Soc.) has narrow tawny and 

 ochraceous-tawny streaks on a Naples yellow ground, which 

 fades near the suture. There are very weak traces of spiral 

 dusky lines, a stronger one at the periphery, exactly as in the 

 type specimen of A. ccesia. The suture is narrowly edged 

 with brown. The embryonic whorls are cinnamon-buff, fad- 

 ing to whitish at the apex, and with an inconspicuous whitish 

 sutural line. The lip is thickened by a distinct narrow, white 

 rib close to the edge. Interior pink tinted. Columellar fold 

 rather weak, central and white. Length 20.2, diam. 11, aper- 

 ture 9.4 mm., 6% whorls. 



Mr. Gulick 's statement that the suture and columella are 

 light colored in scitula is not borne out by the type-specimen,. 



