1904.] NATURAL SCIENCES OF PHILADELPHIA. 819 



more projecting, the right hp less re flexed, thin, irregularly and more or 

 less ohsoletely crenulate. In internal structure it agrees with nakadai. 

 The clausilium (PI. LIII, fig. 22) is more deeply notched distally than 

 in C. nakadai. 



Length 24, diam. 4.6 mm.; whorls IH. 



Length 21, diam. 4.5 mm.; whorls 104. 



From Sanmura and Matsubara specimens were sent (No. 1,205) 

 agreeing with Nakada's Clausilia in internal structure, but with the 

 right lip thin and crenulate only at the edge. Some are glossy and 

 slender, others somewhat stouter and decorticated throughout. 



Clausilia tokunoshimana n. sp. PI. LII, figs. 4, 5. 



Shell cylindric below, the upper half rapidly tapering, solid, very 

 pale brownish-yellow. Surface glossy when unworn, costulate, more 

 • coarsely so on the back of the last whorl. Whorls 10^, moderately 

 convex, the last half of the lower whorl contracted. Aperture trape- 

 zoidal-ovate, white, the outer margin of the peristome well reflexed 

 and thickened within; columellar and parietal margins narrower, 

 closely and finely crenulate (the crenulation sometimes subobsolete). 

 Superior lamella marginal, rather small, continuous with the spiral 

 lamella, which penetrates to the middle of the left side. Inferior 

 lamella forming a prominent columellar fold, more or less distinctly 

 doubled below, penetrating inward as deeply as the spiral lamella. 

 Subcolumellar lamella emerging to the lip-edge, ascending within 

 nearly as far as the other lamellsB. The principal plica is rather short, 

 latero-ventral, not visible in the aperture. Upper palatal plica small, 

 oblique. Lower palatal plica long and bent; the long and very oblique, 

 ventral lunella arising from it in the middle. The lower palatal plica 

 is not visible in the aperture. 



Length 17, diam. 4.2 mm. 



Length 16, diam. 4 mm. 



The clausihum (PI. LIII, figs. 20, 21) is very broad distally, and has 

 a long projection on the columellar side; the palatal side is broadly 

 rounded. It is not excised at the filament. 



Tokunoshuna, Osumi, the types from Sanmura, No. 87,586, A. N. 

 S. P., from No. 1,200 of Mr. Hirase's collection. Other similar speci- 

 mens were sent from Teteyama, near Sanmura (No. 1,200a). 



This species is allied to C. mima of Oshima, but differs in being 

 larger and very coarsely sculptured; the lunella is nearly ventral, 

 and there is a whorl or two more. The clausilium is similar in the 

 two species. 



