1905.] NATURAL SCIENCES OF PHILADELPHIA. 719 



with some deeper, punctate strise among the others; all the strioe being 

 very weak or even obsolete. Whorls 7^ to 8, nearly flat. Some in- 

 conspicuous, slightly paler variceal streaks are visible on the spire. The 

 last whorl has a narrow and often very low crest close behind the outer 

 lip, and the usual keel or cord at the base, defining a small umbilical 

 area. Aperture including peristome seven-twelfths the length of the 

 shell, regularly ovate, slightly oblique. Peristome nearly white; outer 

 lip with a strong internal callus, excised above as usual, and either even- 

 edged or weakly two-toothed near the upper end. Inner lip with three 

 folds, the lower two entering, not emerging to the lip-edge, the upper 

 parietal fold small and tubercular, not longitudinal, sometimes wanting. 



Length 13, diam. 7.3 mm., length aperture 8 mm. 



Length 12, diam. 6.9 mm., length apertm-e 7.4 mm. 



Nishigo, Uzen. Types No. 78,767, A. N. S. Phila., from No. 407 of 

 Mr. Hirase's marine shell collection. 



C. labrella, described from the Isle of France, is a more strongly stri- 

 ate shell with larger aperture. The present form is almost smooth, 

 the striae scarcely being discernible in most specimens. C. plecotrema- 

 toides Mlldff. is more strongly striate, with the upper parietal tooth 

 and the two on the lip-callus better developed. 



I am disposed to consider both the Japanese form descril^ed above 

 and the Chinese C. plecotrematoides as subspecies of C. labrella ; but if the 

 Chinese form be separated specifically, then C. I. japonica will be referred 

 to it as a subspecies. 

 Cassidula paludosa nigrobrunnea n. subsp. 



Similar to C. paludosa Garrett, but the parietal denticle is better de- 

 veloped than usual in that species; the color is deep chocolate brown, 

 with a blackish line below the suture. 



Length 10, diam. 6 mm. ; length of aperture 6.3 mm. 



Length 9, diam. 5.2 mm. 



Length 7.2, diam. 5 mm. 



Kunchan, Ryukyu. Types No. 89,973, A. N. S. Phila., from No. 1,345 

 of Mr. Hirase's collection. 



This little Cassidula has the egg-like shape and high lip-crest of the 

 Vitian C. paludosa, of which the types are before me; but that is, so 

 far as known, invariably yellow or light brown in color. 



