1904.] NATURAL SCIENCES OF PHILADELPHIA. 815 



trate quite so far as the spiral lamella. The subcolumellar lamella is 

 deeply immersed. The principal plica is dorsal and lateral, approach- 

 ing the lip. There is an oblique series of about 5 small, slender palatal 

 plicae situated upon a low ridge. 



Length 14.3, diam. 3.4 mm. 



Length 13, diam. 3.3 mm. 



Length 11, diam. 3 mm. 



The clausilium (PI. LV, figs. 55, 56) is narrow, the distal half tapering 

 to the rounded apex. It is moderately excised on the columellar side 

 of the filament. 



Shimo-Koshikijima, Satsuma. Types No. 87,604, A. N. S. P., from 

 No. 1,239 of Mr. Hirase's collection. 



A small, solid, pale species, not closely related to any form I have 

 seen. The several palatal plicae stand upon a low callous ridge. There 

 is a good deal of variation in size. 



Section TYRANNOPH^DUSA Pils. 

 Clausilia aurantiaoa sakui n. subsp. PI. LV, fig. 52. 



Shell similar in form to C. aurantiaca, but quite thin, finely, distinctly 

 and sharply striate, pale brownish-yellow; whorls 9 to 10. Superior 

 lamella separated from the spiral; subcolumellar lamella emerging ; clau- 

 silium with the upper and lower palatal plicae imperfectly I-shaped 

 (PI. LV, fig. 52), latero- ventral. Clausilium similar to that of C. 

 aurantiaca, but more delicate. 



Length 13, diam. 3 mm. 



Riujin (Akizu), Kii. Types No. 86,473, A. N. S. P., from No. 1,046 

 of Mr. Hirase's collection. 



This form is also somewhat similar to C. caryostoma and C. c. jayi, 

 both of which have the closing armature subventral; but the clau- 

 silium differs, and the palatal plicae are shorter in C. a. sakui. 



Section NESIOPH^EDUSA nov. 

 Group of C. ptychochila Pils., Proc. A. N. S. Phila., 1901, p. 418. 



Phaedusoid Clausiliae of normal contour, with a tendency to weak 

 interlamellar plication. Inferior lamella prominent in the mouth, 

 spirally ascending, thick, sometimes indistinctly doubled within; pala- 

 tal armature lateral, the lunella arising from the middle of a strong 

 lower palatal plica, and curving inward above in a short upper palatal 

 plica. Clausilium very convex on the palatal side, tapering distally 

 to a blunt, thickened apex, channeled on the outer face. Type C. 

 bernardii Pfr. 



