822 PROCEEDINGS OF THE ACADEMY OF [Dec., 



Length 24, diam. 5.5 mm. 

 Length 23.5, diam. 5 mm. 



Like most of the larger Clausilise, it is sometimes overgrown with 

 green algae, and the original surface destroyed. 



Clausilia hickonis saucia n. subsp. 



Shell fusiform, solid, brown. Surface glossy, rather coarsely striate, 

 the strise nearly as wide as the intervals. Penultimate whorl widest, 

 the spire regularly tapering, summit broadly truncate. Whorls remain- 

 ing about 8J (several whitish empty ones sometimes persisting above 

 the apical plug), moderately convex, the last tapering downward. 

 Aperture vertical, piriform, brown within. Peristome white, continu- 

 ous, reflexed, and thickened within; the parietal margin short, straight- 

 ened, barely free. Superior lamella marginal, high and compressed, 

 very oblique, continuous with the spiral lamella, which penetrates 

 past the middle of the ventral side. Inferior lamella strong, approach- 

 ing the superior, appearing below like a strong lamella crossing an 

 oblique, callous columellar fold ; extending inward as far as or further 

 than the spiral lamella. Subcolumellar lamella more or less emerging, 

 but not reaching the lip-edge. Principal plica short, lateral. Upper 

 palatal plica rather long, obliquely converging inward to the principal 

 plica. Lower palatal plica nearly as long, strong, somewhat arcuate, 

 parallel to the upper; a shorter plica midway between them. 



Length 26.3, diam. 6.4 mm. 



Length 27, diam. 6.5 mm. 



Clausilium rather long and nearly parallel-sided, well curved, obtuse 

 and noticeably thickened apically, a little excised on the palatal side 

 of the apex, the rest of the palatal margin being arcuate. Both mar- 

 gins regularly taper to the filament. 



Sodayama, Tosa. Types No. 84,784, A. N. S. P., from No. 1,023 of 

 Mr. Hirase's collection. 



The broadly truncate summit and robust stature distinguish this 

 from C. hickonis. C. fultoni Sykes, which is merely a weakly charac- 

 terized variety of C. vasta Bttg., differs by its more straightly ascending 

 inferior lamella as well as by the entire apex. 



ZAPTYCHOID PHYLUM. 



The material brought together by Mr. Hirase's collector in the islands 

 of the Ryukyu curve this year, enlarge our knowledge of this phylum 

 to such a degree that a revision of the group is required. 



The entire series of Zaptychoid Clausilise consists of small, often 



