318 PROCEEDINGS OF THE ACADEMY OF [March, 



Claiisilium (PI. XIV, figs. 11, 12) long and narrow, widest and pro- 

 jecting a little on each side near the filament, tapering distally ; excised 

 on the columellar side of the filament. 



Shimohanyama, Tosa, Shikoku. Types No. 84,392, A. N. S. P., 

 from No. 1,014 of Mr. Hirase's collection. 



Similar to C. aratorum in sculpture, aperture and lamellre, but having 

 a distinct lower palatal plica and a low lunella upon which several low 

 plicae are seen, in this respect resembling C. tosana. The latter is a 

 more finely striate shell with the last whorl projecting more in front, 

 and the clausilium of a different shape. 



(Group of C. 'platyauchen.) 

 Clausilia platyderula n- sp. 



Shell similar to C. platydera, but much smaller; brown; finely and 

 sharply striate. Superior lamella compressed, marginal, continuous 

 with the spiral lamella, which penetrates past the ventral side. The 

 inferior lamella penetrates equally far. The subcolumellar lamella 

 emerges at least slightly. The lunella is like that of platydera. 



Length 17, diam. 3.8 mm. 



Length 15, diam. 3.3 mm. 



Aki, Tosa, Shikoku Island. Types No. 84,443, A. N. S. P.,, from No. 

 434d of Mr. Hirase's collection. 



It will be figured in a general review of the species of the platyauchen 

 group, in preparation. 



Section TYRANNOPH.EDUSA Pils. 

 Clausilia bilabrata var. tosaensis nov. 



A small form with the shell very strong, the spire entire, and the 

 aperture comparatively small, its greatest length contained 4^ times in 

 that of the shell ; superior and spiral lamellae not united or but weakly 

 so. Whorls about 12. 



Length 20, diam. 4.3 to 4.8 mm. 



Shiujomura, Tosa, Types No. 84,378, A. N. S. P., from No. 1,012 

 of Mr. Hirase's collection. 



Section STEREOPHiEDUSA Bttg. 

 Clausilia ecMgoensis n. sp. 



Shell wide below, rapidly tapering upward, attenuate near the apex, 

 several early whorls hardly increasing in diameter, making the outlines 

 concave above; dark chestnut colored, yellow or paler Ijelow the 

 suture. 



Surface very glossy, sculptured with coarse, oblique ribs, narrower 



