810 PROCEEDINGS OF THE ACADEMY OF [Dec. 



cipal plica short; upper palatal plica short but well developed, a low 

 ridge (lunella) below it. 



Length 42, diam. 9 mm. ; whorls 11. 



Length 39, diam. 9 mm. ; whorls 10. 



Amagisan, Izu. Types No. 85,730, A. N. S. P., from No. 1,139 of 

 Mr. Hirase's collection. 



Clausilia cymatodes n. sp. PI. LIV, figs. 29, 30, 31, 32, 33. 



Shell rimate, strong, the last two whorls of about equal diameter, 

 occupying over half the length of the shell, those above rapidly taper- 

 ing, somewhat attenuate toward the apex. Yellowish-brown. 



Surface glossy, sculptured with coarse strong somewhat irregular 

 ribs, rapidly decreasing to striae on the spire, the early whorls smooth 

 from wear. Whorls 10J, convex, the last flattened laterally. The 

 aperture is rhombic-ovate, vertical. Peristome continuous, rather 

 broadly reflexed and thickened within. Superior lamella marginal, 

 rather high, continuous with the spiral lamella, which penetrates to a 

 point above the superior lamella. Inferior lamella low and receding, 

 thick below, obliquely ascending, as long inside as the spiral lamella. 

 Subcolumellar lamella emerging. Principal plica dorsal and lateral, 

 extending past the palatal plicae, of which there are three, lateral in 

 position. 



Length 22, diam. 5 mm. 



Length 21, diam. 4.7 mm. 



Clausilium (PL LIV, figs. 29, 30, 31) narrow and parallel-sided, obtuse 

 and obliquely rounded at the apex, bluntly angular in the middle of 

 the palatal margin, not excised near the filament. 



Tajiromura, Osumi. Types No. 87,610, A. N. S. P., from No. 1,249 

 of Mr. Hirase's collection. 



This rib-striate little Megalophcedusa is related to C. hiraseana. It 

 differs in being much smaller, light colored, not quite so coarsely 

 sculptured, with emerging subcolumellar lamella. C. nagashimana 

 of the neighboring province Satsuma is more closely related, but that is 

 also a large dark form. Both of these species differ widely from 

 C. cymatodes in the shape of the clausilium, which in cymatodes is very 

 obtuse at the distal end. The number of palatal plicae will probably 

 prove to be variable. 



Clausilia nagashimana n. sp. PI. LIV, figs. 25, 26, 27, 28. 



The shell is similar to C. hiraseana Pils., but it is much more finely 

 sculptured, and the superior lamella does not reach the margin. 



Length 28, diam 6.6 mm.; whorls about 11^. 



