1902.] NATURAL SCIENCES OF PHILADELPHIA. 369 



free last whorl, this species is related to C. tosana Pils. ; but it 

 differs from tosana in the more deeply penetrating lamellae and 

 principal plica, the distinct lunella connecting the two palatal plicae 

 I-like, and the larger size of the less slender shell. ^Moreover, the 

 clausilium is deeply excised on the columellar side near the filament, 

 as in C. harhnensis, while in tosana it merely tapers there. 



C. pigra is probably not closely related to C. aulacophora, 

 although by parallel evolution it has attained the same type of 

 palatal armature. 



At Nametoko, lyo, on Shikoku Island, a form of C. tosana occurs 

 in which there is an imperfect lunella in place of the intermediate 

 palatal plicsc, at least in some specimens (No. 82,288, A. N. S. P., 

 from Mr. Hirase's No, 5506). 



Group of C. awajiensis. 



Tavo remarkable additions are made to this group in C. agna and 

 C. caloptyx, the first veiy glossy and smooth, the second beautifully 

 sculptured with strong riblets. 

 Clausilia subignobilis Pilsbry. PL XIX, flgs. 33, 34, 35, 36. 



These Proceedings for 1901, LIII, p. 655, footnote No. 9 (March 1, 

 1902). 



Shell fusiform, attenuated above, very pale reddish-brown or 

 gray-brown, somewhat glossy, finely striate, on the last half of the 

 last whorl more coarsely so. Aperture trapezoidal -ovate, slightly 

 oblique. Peristome well expanded, continuous, shortly free and 

 concave or notched above. Superior lamella small, marginal, dis- 

 connected from or barely connected with the spiral lamella, which 

 penetrates barely to the ventral side. Inferior lamella dec[)ly 

 receding, slender and vertically ascending within, about as long as 

 the spiral lamella. Subcolumellar lamella emerging to the lip-edgo, 

 and bounded by grooves. Principal plica short, lateral, the lunella 

 bow-shaped, its upper and lower ends bending strongly inward. 



Length 15.2, diam. 3.5 mm. 



Length 13, diam. 3.1 mm. 



Clausilium narrow, parallel-sided, rounded at the apex, some- 

 what excised on the columellar side of the filament. 



Hirado, Hizen, in Avestern Kyushu. Types No. 82,954, A. N, 

 B. P., from No. 733 of Mr. Hirase's collection. 



Close to C. shikokaemis, in which, however, the spiral and infe- 

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