1904.] NATURAL SCIENCES OF PHILADELPHIA. 829 



piriform, the peristome very narrowly reflexed, whitish. Superior 

 lamella small and low, widely separated from the low short spiral 

 lamella. Inferior lamella receding, not visible in a front view; low and 

 obliquely ascending within. Subcolumellar lamella emerging, very 

 slender, rising angularly on the palatal wall below the lunella. A short 

 fulcrum and parallel lamella are present. Principal plica dorsal and 

 lateral, visible in the aperture. Upper palatal plica extremely short, 

 weakly connected with the lunella, which is straight above, but curves 

 inward slightly at the lower end. There are three short sutural plicae, 

 the middle one often inconspicuous. 



Length 9, diam. 2.1 mm. 



Length 7.2, diam. 1.7 to 2 mm. 



Clausilium (PL LVI, figs. 68, 69) rather long, parallel-sided, rounded 

 at the apex, deeply excised at the columellar side of the filament. 



Kikaiga-shima. Osumi. Types Nos. 79,728 and 80,787, A. N. S. P., 

 from Nos. 557 and 5576 of Mr. Hirase's collection. It has also been 

 found by Mr. Nakada at Tokuno-shima, Osumi (No. 1,203 of Mr. 

 Hirase's collection). It will probably turn up on the intermediate 

 islands of the Oshima subgroup. 



This species is closely related to C. hyperoptyx of Ryukyu (Okinawa), 

 but it differs in the less swollen embryonic whorls, shorter upper palatal 

 plica, less developed superior lamella and usually smaller size, though 

 the largest specimens of kikaiensis are equal to hyperoptyx. C. hirasei, 

 from Satsuma, along Kagoshima Bay, is a decidedly wider shell, with 

 less attenuated spire. The clausilium in C. kikaiensis resembles that 

 of C. hirasei and C. sarissa, but it is decidedly less dilated on the palatal 

 side of the filament than in C. hirasei. 



I formerly considered the Kikai specimens to be a variety of C. 

 hirasei (these Proceedings for 1901, p. 465), but further study of much 

 larger series of both forms shows that their differential features are 

 constant. They are rather widely separated geographically. 



Clausilia sarissa n. sp. PL LVI, figs. 72, 73, 74, 75. 



Shell cylindric below, tapering and a little attenuated above ; brown, 

 the fully adult shells marked with whitish or creamy lines and streaks. 

 Surface somewhat glossy, very faintly striatulate, nearly smooth, the 

 last third of the last whorl sharply, finely striate. Whorls 8, quite 

 convex. Aperture ovate, the peristome narrow, reflexed, and in fully 

 adult shells somewhat thickened at the edge. Superior lamella small, 

 vertical, not continuous with the low small spiral lamella. Inferior 

 lamella receding, visible only in an oblique view in the aperture, high 



