1904.] NATURAL SCIENCES OF PHILADELPHIA. 813 



C. awajiensis, except in having a lower palatal plica distinct from the 

 lunella a structure not found in any other known species of that 

 group. The lower end of the lunella curves inward less than in most 

 species of the group of C. awajiensis. It has some characters of 

 Hemizaptyx. 



Clausilia platydera var. minoensis nov. 



Shell smaller than platydera, with the last whorl built forward, carry- 

 ing the aperture shortly free. Upper palatal plica rather long, arcuate, 

 making an angle with the lunella instead of being merely a short curve 

 continuous with the latter. The subcolumellar lamella is immersed 

 or weakly emerges. 

 k Length 18, diam. 3.9 mm. 



Length 18, diam. 3.5 mm. 



Length 15, diam. 3.3 mm. 



Minakamimura, Mino. Types No. 86,468, A. N. S. P., from No. 

 1,172 of Mr. Hirase's collection. 



Clausilia mikawa n. sp. PI. LIV, figs. 39, 40, 41. 



Shell subcylindric below, tapering above, the spire moderately 

 attenuate and rather thick, the four or five upper whorls widening 

 very little, then the intermediate whorls increase rapidly. Thin, pale 

 greenish-yellow, imperfectly translucent. Sculpture of nearly regular, 

 oblique and fine rib-striae, the intervals very finely striate spirally. 

 The sculpture is not noticeably coarser on the back of the last whorl. 

 Apex obtuse. Whorls 11, convex. Aperture sub vertical, widely ovate, 

 the peristome white, narrowly reflexed, somewhat thickened within, 

 adnate above, but continuous in a slightly raised ledge across the 

 parietal wall. Superior lamella small and compressed, oblique, contin- 

 uous with or contiguous to the spiral lamella, which penetrates to the 

 middle of the ventral side. Inferior lamella receding, but visible as a 

 rather sharp fold in the throat, slightly spiral as seen within the back, and 

 penetrating a little deeper than the spiral lamella. Subcolumellar 

 lamella immersed or weakly emerging. Principal plica short, dorsal 

 and lateral. Palatal plicae 3 or 4, visible through the shell, subequal 

 or the intermediate 1 or 2 shorter. 



Length 21 to 22, diam. 5 mm. 



Clausilium thin and rounded distally, not excised near the filament. 



Sanganeyama, Mikawa. Types No. 86,519, A. N. S. P., from No. 

 1,167 of Mr. Hirase's collection. 



This pale and rather thin species is more distinctly decussate between 

 the striae than other forms known to me. It has the color of some 



