1907.] NATURAL SCIENCES OF PHILADELPHIA. 507 



Soction ZA['TVX Pil.s. 



The following .species enlarges our conceptions of Znplijx \)X a stiuc- 

 tiire not before known in the section; the upper palatal plica being 

 greatly lengthened, as in IlcUrozapti/x, while in the oth(>r known 

 species of Zapti/x it is comparatively short. 

 Clausilia dolichoptyx n. &p. PI. XXXIV. 30-33. 



Shell slender, fusiform-turrited, chestnut-brown, rather opaque, 

 shining; the spire long, tapering and somewhat attenuate, apex obtuse, 

 whitish. Whorls 9^ to 10, convex, very slowly increasing, irregularly 

 striatulate or marked with growth-wrinkles. Aperture narrowly 

 piriform, small; the peristome white, continuous, narrow^ly expanded, 

 the outer lip a little reflexed. The superior lamella is very small or 

 subohsoletc; the spiral lamella is reduced to a very small, short lamella in the 

 region of the lunella. The inferior lamella recedes deeply, being hardly 

 visible in the aperture; in the back it ascends obliquely, is low, rather 

 thick and straightened, not continuous with a short portion which 

 lies parallel to the short spiral lamella. There is a fulcrum and a 

 parallel lamella. The subcolumellar lamella is usually quite immersed, 

 but sometimes emerges. The principal plica is short, about a fourth 

 of a whorl long, and in a lateral position. The upper palatal plica is 

 very long, the lunella joined to it near its inner end ; thence it diverges 

 from the principal plica, running towards the aperture. The lunella 

 is long and nearly straight. Two short sutural plicre stand above 

 the lunella. 



Length 12.5, diam. 3, length of aperture 2.5 mm. 

 " 10.5 " 2.5, " " " 2 " 



Clausilium (PI. XXXIV, figs. 31, 32) with the curvature chiefly near 

 the filament, as usual in Zaptyx; very wide above, tapering distally, 

 rounded at the apex. It is deeply excised on the columellar side of 

 the filament, and much dilated on the palatal side. 



Heda, Kunchan, Ryukyu. Types No. 90,020, A. N. S. P., from 

 No. 1,3-12 of Mr. Hirase's collection. 



This species is readily recognized by the very long upper palatal 

 plica, the small superior lamella very widely separated from the short 

 spiral lamella, and the number of whorls, which is greater than in the 

 other species. With the exception of the upper palatal plica, the 

 structure is not unlike that of C. hirasei, the type of Zaptyx {dolichoptyx, 

 long fold). 



Clausilia dolichoptyx miora n. subsp. 



Shell smaller than C. dolichoptyx, nearly smooth except the last half 



