378 PROCEEDINGS OF THE ACADEMY OP [May, 



or having a group of folds in Ihat region (fig. 77). Superior 

 lamella oblique, attaining the margin, rather widely separated from 

 the spiral lamella. Spiral lamella continued inward to a point 

 above the sinulus. Inferior lamella deeply receding, though often 

 continued to the lip-edge, obliquely and straightly ascending within, 

 and continued inward a little beyond the termination of the spiral 

 lamella. Subcolumellar lamella emerging to the lip-edge, and 

 usually bounded by grooves. The principal plica is about a half- 

 whorl long, extending from a dorsal to a ventral position. The 

 lunella is strong, latero- ventral, its upper end curving inward, lower 

 end united to the lower palatal plica at or near its inner end. 



Length 19, diam. 4.1, diam. of second whorl 1 mm. 



Length 17, diam. 3.8, diam. of second whorl .8 mm. 



Clausilium narrow, oblique at the distal end, thickened along 

 the columellar margin and distally, as usual in Tyrannophcedusa. 



Tairiuji, Awa, Shikoku Island. Types No. 82,957, A. N. S. P., 

 from No. 819 of Mr. Hirase's collection. 



This peculiar species resembles C. mikado Pils. in its much 

 attenuated, concave-sided spire, which is more slender than that of 

 C. iotaptyx Pils. It stands between iotaptyx and mikado in the 

 number of whorls. The aperture is formed about as in C. iotaptyx, 

 not being built forward as in C. mikado. From both of the 

 species named it differs in palatal armature, the lunella being like 

 that of C. bilabrata Smith. The spire is apparently not subject to 

 self -amputation, the apex being entire in the six specimens before 

 me. The clausilium is of the shape usual in Tyrannophcedusa. 



C. dalli is named for the Honorary Curator of the Department 

 of Mollusks of the U. S. National Museum. 



Section EUPH^EDUSA Boettger. 

 Clausilia holotrema Pilsbry. PI. XXI, fig. 72. 



Pilsbry, these Proceedings for 1901, p. 654, footnote No. 8 (March 

 1, 1902). 



Shell rimate, fusiform, the upper third rapidly tapering to a 

 minute apex ; vinous brown, ivith a wide corneous zone below the su- 

 ures, which is largely covered with whitish papery cuticle (like that 

 of Helicostyla) ; some interrupted spiral lines of the same appear- 

 ing upon the dark color, and oblique streaks on some earlier whorls. 

 The base of the last whorl is pale-corneous. Surface somewhat 



