THE NAUTILUS. 79 



Microcystina nuda P. & H., n. sp. 



Shell minute, imperforate or nearly so, depressed, yellowish, glossy 

 and smooth. Whorls 4, slowly increasing, the last indistinctly and 

 obtusely subangular at the periphery, above the middle ; impressed 

 around the axis. Aperture lunate, subvertical, the lip simple, acute, 

 dilated at the axis, the columellar margin a little thickened. Alt. 

 1.2, diam. 2.6 mm. 



Hakusan, Kaga. Types no. 83880 A. N. S. P., from no. 973 of 

 Mr. Hirase's collection. 



Apparently related to the smaller M. siriapidium, both belonging to 

 Reinhardt's group Discoconulus. (midus, naked). 



Kaliella kagaensis Pils. & Hir., n. sp. 



Shell subperforate, low-trochiform, yellowish and glossy. Surface 

 marked with faint growth-lines, the second whorl delicately and very 

 minutely costellate ; base showing some faint spirals. Whorls 5, 

 somewhat convex, slowly increasing, the last angular at the peri- 

 phery, convex below. Aperture lunate, oblique, the peristome 

 simple and thin, columellar margin subvertical, narrowly expanded. 

 Alt. 2.4, diam. 3.2 mm. 



Hakusan, Kaga. Types no. 83882 A. N. S. P., from no. 971 of 

 Mr. Hirase's collection. 



A shell almost identical in contour with K. okiana, but smooth 

 and glossy, and a little larger. 



Kaliella gudei Pils. & Hir., n. sp. 



Shell large for the genus, perforate, conic, thin, pale yellowish, 

 somewhat translucent, smooth except for slight, irregular growth- 

 lines. The outlines of the spire are slightly convex, nearly straight, 

 last whorl with a narrow, thread-like peripherel keel, which ascends 

 the spire and is visible as a narrow border above the suture. Whorls 

 6 to 6^, quite convex, the last convex above and below the keel, 

 slightly impressed around the perforation. Aperture truncate-lunar, 

 the lip simple, columellar margin dilated, reflexed. Alt. 5, diam. 

 6.2 mm. 



Kayabe, Ojima. Types no. 81922 A. N. S. P., from no. 678 of 

 Mr. Hirase's collection. Also Hakodate, Ojima. Mt. Moiwa, two 

 miles from Sapporo, Ishikari (Paul Rowland); all in Yesso. 



This is the largest Japanese species, and one of the largest of the 



