Descriptions of New Species of Achatinella. 179 



Shell dextral, imperforate, ovately turreted, rather thin, 

 scarcely shining, dark brown, corneous, finely and rather regu- 

 larly striated ; apex somewhat obtuse, suture simple, moderately 

 impressed ; whorls 6h, convex ; columellar fold central, brown 

 or white ; aperture vertical, truncately oval ; peristome simple ; 

 with dextral margin unrefiected, arcuate ; columellar margin 

 dilated, thin, white, adnate ; parietal margin wanting. 

 " Length 0.39 inch (10 mill.). Breadth 0.17 inch (4^- mill.). 



Length of body whorl 0.23 inch (6 mill.). 



Average weight 0.50 grain. 



Station. — Among dead leaves, in damp places. J. T. G. ! 



Habitat. — On the mountain ridge of Iveawaawa, Oahu. 

 J. T. G. ! 



JRemarks. — A very dark-brown, turreted species, nearly 

 allied to A.fusca Newc, which it resembles in its striated sur- 

 face and corneous structure. A. fusca is, however, broader 

 at the base, with a shorter spire, and usually of a lighter color, 

 with a single dark band ; but we have one specimen of a dark 

 corneous color throughout, which shows an evident affinity 

 with this species. 



It is found near the eastern extremity of the mountain ridge 

 which forms the back-bone of the island. Its distribution is 

 very limited, there being but little vegetation in that region. 



7. Achatinella marginata. 



Plate VI. Fig. 7. 



T. dextrorsa, imperforata, ovata, nitida, semipellucida, cornea, fascia 

 fusca, diffusa ornata, tenuissime striata ; apice obtusa ; spira convexo- 

 conica ; anfr. 6, convexiusculis ; ultimo superne valide marginato ; plica 



