466 PROCEEDINGS OF THE ACADEMY OF [July, 



known, 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 8J, 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 subre flexed. 

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

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

 position, a short lamella fulcrans 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 plicse lying above it; upper palatal plica exceedingly 

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

 straight. 



Clausilium strongly curved throughout, the apex rounded, 

 straightened or slightly emarginate on the palatal side, near the 

 apex. 



Length 10, diam. 2J to 2J mm. 



Bachijo (or Hachijo) Island, prov. Izu (Mr. Y. Hirase, No. 

 688). 



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

 Hirasei and C. hyperoptyx, but is a trifle wider. It differs from 

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

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

 In C. Hirasei it stands free of the lunella, and in C. hyperoptyx 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 in 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 in the Pacific just above the 33d parallel N. 

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

 the nearest mainland, and is about twenty-one miles long by seven 



