1904.] NATURAL SCIENCES OF PHILADELPHIA. 817 



ing, slightly attenuated above. Pale yellow. ■\\Tiorls IH, convex, 

 finely striate, the last whorl becoming coarsely striate behind. Aper- 

 ture broadly piriform, white. Peristome with the outer and basal 

 margins well reflexed and thickened within; columellar and parietal 

 margins beautifully crenulate. Superior lamella marginal, compressed, 

 continuous with the spu-al lamella, which penetrates past the aperture 

 to the left side. Inferior lamella forming a rather small, subhorizontal 

 fold in the aperture, with an accessory fold below it extending to the 

 margin; as long inside as the spiral lamella. Subcolumellar lamella 

 emerging to the lip-edge, decidedly shorter inside than the other lamella. 

 The principal plica is long, visible in the throat, extending across the 

 ventral side. The upper palatal plica is very oblique. Lower palatal 

 plica long and angularly bent, a very oblique and rather long lunella 

 arising from the angle. It lies in a sub ventral position. 

 Length 25.3, diam. 6 mm. 



Clausilium rather broad, truncated distally, with a wide and rather 

 long, thick apical projection on the columellar side, and a slight pro- 

 jection on the outer side of the end; the palatal margin rounded. 



Shimo-Koshikijima, Satsuma. T}T3e No. 87,603, A. N. S. P., from 

 No. 1 ,237 of Mr. Hirase's collection. 



This fine species is related to C. calHstochila, from which it differs in 

 the following peculiarities : The striation is finer; the inferior lamella is 

 more distinctly doubled below; the lunella is longer and more ventral 

 in position, and the clausilium has a larger process at the apex. It is 

 also related to C. una Pils., of Goto, Hizen; but in that species the 

 lunella is shorter and lateral, and the clausilium is much less specialized, 

 being much like that of Stereophcedusa. 



C. azumai is one of the finest species collected this year by Mr. Azuma 

 in the islands of Satsuma. 



Clausilia una, which I formerly placed in StereojjJicEdusa, should 

 probably be transferred to Luchu'phcedusa or to a separate and special 

 section allied to Luchuphadusa, characterized by the unspecialized 

 clausilium, while all other structures are Luchuphsedusoid, 

 C. azumai idiopylis n. subsp. PI. LII, fig. 8. 



Somewhat smaller than C. azumai and dull reddish-brown; inner 

 lip less strongly crenate; inferior lamella thickened but not distinctly 

 doubled below; subcolumellar lamella immersed. Clausilium (PI. 

 LIII, fig. 17) more oblique and more distinctly notched distally. 

 Length 22, diam. 5.3 mm.; whorls 11^. 



This form, sent with azumai, may prove to be included in the 

 range of variation of that species, but in the absence of interme- 



