818 PROCEEDINGS OF THE ACADEMY OF [Dec., 



diate specimens it seems best to call attention to its differential 



features. 



Clausilia nakadai n. sp. PI. LII, figs. 9. 10, 11. 



Shell fusiform, moderately attenuate above; yellow, the worn early 

 whorls whitish, nearly lusterless, finely striate. Whorls 10, convex, the 

 latter half of the last flattened. Aperture piriform, white within, with 

 distinct, slightly retracted sinulus. Peristome broadly reflexed, with 

 a fold or doubling behind, thickened within. Columellar and parietal 

 margins crenulated. The superior lamella is compressed, vertical and 

 marginal, and continuous with the spiral lamella, which is very high, 

 and penetrates past the ventral side to the middle of the left side. 

 The inferior lamella projects as a very strong columellar fold in the 

 aperture, and penetrates inward slightly farther than the spiral lamella. 

 The subcolumellar lamella emerges to the lip-edge, and penetrates as 

 deeply as the spiral lamella. The principal plica extends nearly to the 

 lip, and enters deeply. There is a rather long, oblique upper palatal 

 plica, and an obliquely ascending and entering lunella arising from 

 the summit of a long, angularly bent lower palatal plica ; all lying in a 

 nearly ventral position. The lower end of the lower palatal plica is 

 visible in the aperture in an oblique view. 



Length 20.5, diam. 5 mm. 



Length 18.5, diam. 4.8 mm. 



Clausilium (PI. LIU, figs. 18, 19) strongly curved spirally, the colu- 

 mellar side of the apex projecting in a thick blunt process, the 

 palatal side rounded, a wide shallow notch in the middle. Proximally 

 it tapers gradually and without excision into the filament. 



Matsubara, Tokunoshima. Types No. 87,594, A. N. S. P., from No. 

 l,205a of Mr. Hirase's collection. 



C. nakadai is intermediate between C. callistochila and C. oshimce in 

 size, geographic position and morphology. The aperture resembles 

 that of oshimce in shape, but is wider, and the right lip is more crenu- 

 lated. The lamellae are not quite so long as in oshimce. The lunella 

 is better developed than in either of the other species, and the lower 

 palatal plica is far shorter than in C. oshimce, but differs from that of 

 callistochila in shape. 



This handsome Luchuphcedusa is named in honor of Mr. Nakada, 

 who has brought to light more Riukiuan land snails than all other 

 collectors combined. 

 C. nakadai degenerata n. subsp. PI. LII, fig. 12. 



Fresh specimens are pale corneous-buff, very glossy, and typically 

 more slender than nakadai, with the aperture a little narrower and 



