192 Descriptions of New Species of Achatihella. 



Remarks. — A. gracilis Pfr. is the most nearly allied form 

 heretofore described. But it cannot be confounded with that 

 species, for it is darker, thinner, of more clear corneous struc- 

 ture, and never furnished with brown bands. For its dis- 

 tinctive characters as compared with A. octogyrata Nob. see 

 remarks on that species. 



20. Acliatinella tiflirita. 



Plate VI. Fig. 20. 



T. dextrorsa, imperforate, ovato-turrita, tenuiuscula, nitida, translu- 

 cida, fusco-eornea, striatula ; apice obtusa, pallida ; spira turrita ; sutura 

 simplici, leviter impressa ; anfr. fere 9, plano-convexis ; plica columel- 

 lari mediocri, albida ; apertura rotundato-hmata ; pcrist. simplici ; 

 margine dextro recto, arcuato ; columellari dilatato, tenui, adnato ; 

 parietali nullo. 



Shell dextral, imperforate, ovately turreted, rather thin, 

 shining, translucent, dark corneous, finely striated ; apex ob- 

 tuse, pallid ; spire turreted ; suture simple, lightly impressed ; 

 whorls nearly 9, flatly convex ; columellar fold moderately de- 

 veloped, whitish ; aperture roundly lunate ; peristome simple ; 

 with dextral margin unreflected, arcuate ; columellar margin 

 dilated, thin, adnate ; parietal margin wanting. 



Length 0.36 inch (9 mill.). Breadth 0.15 inch (4 mill.). 



Length of body whorl 0.19 inch (5 mill.). 



"Weight 0.25 grain. 



Station. — On the ground in the woods. J. T. G. ! 

 Habitat. — Mountain ravines of Lihue, Oahu. J. T. G. ! 



Remarks. — Resembles A. octogyrata Nob. in form, but is 

 thicker, more polished, with striaj not regularly developed, and 

 umbilical cleft entirely wanting. 



