THE NAUTILUS. 45 



within, white, noticeably grooved at the position of the keel, below 

 which it is more thickened, expanded and narrowly reflexed. Alt. 

 14, diam. 27, width of umbilicus G.5 mm.; width of aperture 11, ob- 

 lique alt. 10.5 mm. 



Kunchan, tlie northern province of Riukiu Island. Type no. 

 84924 A. N. S. P., from no. 1080 of Mr. Hirase's collection. 



A large, solid species, with the keel margined on both sides, and 

 projecting a trifle at the suture. 



Eulota {Aegista) friedeliana var. peraperta n. v. 



Differs from friedeliana from Nagasaki, the type locality, in the 

 more widely open umbilicus and the noticeably smaller aperture in 

 shells of the same size. Alt. 9, diam. 17 mm.; width of umbilicus 

 5.5 mm. 



Isshochi, Higo. Type no. 84925 A. N. S. P., from no. 343a of 

 Mr. Hirase's collection. 



Eulota {Plectoti-opis') conomphala n. sp. 



Shell umbilicate, depressed, low-conic above and below the acute 

 peripheral keel. Thin, light brown, nearly lustreless, slightly stri- 

 ated with growth lines, and showing very fine, close, rather indis- 

 tinct spiral lines under a lens, obsolete in places. On the upper sur- 

 face there are sparse, short cuticular processes, easily rubbed oflT. 

 Whorls 6|-, slowly widening, nearly flat, the keel of the last whorl 

 bearing a fringe of cuticular filaments, triangular at their bases. 

 Base angular around the deep, conic umbilicus. Last whorl very 

 little descending in front. Aperture oblique, the upper margin of 

 the peristome simple, basal margin thin, very narrowly reflexed ; 

 columellar margin dilated above. Alt. 9.5, diam. 19.5 mm. 



Yakujima, Osumi. Type no. 84926 A. N. S. P., from no. 905a 

 of Mr. Hirase's collection. 



A very distinct, thin species, noticeably bi-conic in shape, and 

 angular around tlie regularly conic umbilicus. It is an interesting 

 addition to the fauna of Yakujima. 



Hirasen planulata n. sp. 



Shell imperforate, discoidal with rounded periphery and level 

 upper surface. Yellowish brown, dull and very densely, very finely 

 radially striate above, becoming smooth and glossy beneath. Spire 



