466 PROCEEDINGS OF THE ACADEMY OF ['I^lv, 



knowu, as well as one of the most complicated in internal struc- 

 ture. 



Clausilia hachijoensis n. sp. PI. XXVII, figs. 39, 40. 



Shell fusiform, rimate, rather thin, of a dark, rich brown color; 

 rather weakly wrinkle-striate, the latter part of the last whorl 

 distinctly and sharply striate. "Whorls 8 to Sh, slightly convex, 

 the apex obtuse, the last whorl somewhat flattened laterally, and 

 gibbous or sack-like below. Aperture trapezoidal-piriform, the 

 peristome continuous, brown, narrowly expanded and subreflexed. 

 Superior lamella rather small, compressed, vertical, distant from the 

 spiral lamella. Spiral lamella short, lateral, not reaching a ventral 

 position, a short lamella Julcrans lying parallel to it. Inferior 

 lamella receding, immersed, visible in an oblique view in the aper- 

 ture, moderately spiral within; subcolumellar lamella either emerg- 

 ing or immersed. Principal plica short and lateral, one or two 

 short sutural plicre lying above it; dipper palatal plica exceedinrjhj 

 short and joining the lunella. Lunella lateral, rather long and 

 straight. 



Clausilium strongly curved throughout, the apex rounded, 

 straightened or slightly emarginate ou the palatal side, near the 

 apex. 



Laugth 10, diam. 2 J to 2^ mm. 



Bachijo (or Hachijo) Island, prov. Izu (Mr. Y. Hirase, Xo. 

 638). 



This species is about the size of the largest specimens of C. 

 Hirasel and C. hyperoptyx, but is a trifle wider. It difiers from 

 both in wanting a parallel lamella, and the upper palatal plica is 

 extremely short, a mere dilation of the upper end of the lunella. 

 In C Hirasel it stands free of the lunella, and in C. hyjjeroptyx is 

 united with it and is much longer. The principal plica is shorter 

 than in the other two species. The clausilium is much more 

 curved than iu either of these species, and its apical end has a 

 somewhat different shape. 



The specimens were sent with C. Tryoni, an Euphcedusa much 

 resembling this species in size and color. 



Bachijo or, as most charts spell it, Hachijo (or sometimes 

 Fatsizio) Island lies iu the Pacific just above the 3.3d parallel Is^. 

 lat., and near 140° E. long. It is somewhat over 100 miles from 

 the nearest mainland, and is about iwenty-oue miles long by seven 



