1902.] NATURAL SCIENCES OF PHILADELPHIA. 365 



tapering-rounded and thin at the apex, hardly excised on the colu- 

 mellar side of the filament. 



Ikoma, Kii. Types No. 82,484, A. N. S. P., from No. 7666 

 of Mr. Hirase's collection. Also Tomisato, Kii, No. 766a, and 

 Samotonaka-mura, Kii, No. 766c (Mr. Hirase). 



This form seems to be related to C. wbulina Mlldff., an un- 

 figured species described from Lake Chusenji in Shimotsuke Prov- 

 ince, west of beautiful Nikko. It is apparently somewhat less 

 slender than that, not especially rugose striate on the last whorl, 

 with a better developed lunella. I have not seen C. subulina. 



Old specimens become dull and opaque, and lose much of the 

 fine striation by wear. Some of the shells from Tomisato are of 

 a light brown tint, others being whitish -corneous like the types. In 

 two specimens opened from Ikoma (No. 769) the lunella is so 

 weak as to be hardly perceptible. The indistinct vestige would not 

 be noticed in these shells were it not better developed in others of 

 the species. It is apparently an abundant shell in the Province Kii. 



Clausilia sericina var. rhopalia Pilsbry. PI. XVIII, figs. 23, 24, 25, 26, 27. 

 Pilsbry, these Proceedings for 1901, p. 624 (February 6, 1902). 



Figures are here given of the types of this subspecies, not 

 hitherto figured. It is a larger and stouter shell than C. subulina 

 var. leucopeas, and the inferior lamella forms a more or less prom- 

 inent columellar fold. It is from Mikuriya, Suruga. 



Compared with the description of C. sericina Mlldff., from Lake 

 Chusenji, these specimens differ in the emerging inferior lamella 

 and the palatal armature, which, if von Mollendorff ' s description 

 is correct, must be quite different, as he states, after mentioning the 

 deeply placed principal plica, that it has two palatal plicae, the 

 upper short, second punctiform or obsolete, the lower and the lunella 

 wanting. In rhopalia there is a single short upper palatal plica 

 and a long, narrow lunella. In external contour the two forms 

 agree. 



The type of C. sericina was in the Hungerford collection, and its 

 present location is unknown to me. 



Group of C. validiuscula. 

 Clausilia oarystoma Mlldff. PI XVII, figs, l, 2. 



Mollendorff, Journ. Asiat. Soc. Bengal, LI, pt. 2, p. 6, PI. 1, fig. 5 

 (1882); L1V, pt. 2, p. 65 (1885). 



Specimens before me from Kobe, Setsu, the type locality, agree 



