108 THE NAUTILUS. 



Clausilia euholostoma n. sp. An exceedingly peculiar Eupluzdusa. 

 The shell is very small, alt. 7.6, diam. 2.4 mm., with broadly oval 

 (not in the least pyrif'orm) aperture, continuous white peristome, and 

 only a single lamella, the inferior, developed. This lamella is shaped 

 as in CL monelasmus Pils. The principal plica and the lamella 

 spiralis are extremely short and lateral in position ; short upper and 

 lower palatal plicae are developed. There are about 7^ whorls, the 

 surface densely striated. The clausilium is Euphasdusoid. Hab., 

 Mikuriya, prov. Suruga (No. 5G3 of Mr. Hirase's register). 



Clausilia japonica var. interplicata n. v. A dark colored, glossy 

 variety, with several palatal plicae developed between the usual 

 upper and lower palatals of typical C. japonica. Nishigo. Uzen 

 (No. 403 of Mr. Hirase's register). Other specimens from Takeya, 

 Izuino, are less glossy, and irregular in the development of the 

 " interpalatal " folds. 



The following species belong to the section Hemiphcsdusa : 



Clausilia perpallida n. sp. General form of C. aurantiaca var. 

 erberi ; pale corneous, finely striate. Superior lamella moderate, in- 

 ferior receding, subcolumellar deeply immersed; closing apparatus 

 lateral, the principal plica long, upper palatal well developed, a low, 

 broad, nodule-like lunella below but not joining it; no lower palatal 

 fold. Length 11.5, diam. 2.5 mm. Nishigo, Uzen (460 b of Mr. 

 Hirase's register). 



Clausilia harimensis n. sp. Similar to C. aurantiaca or a little 

 more slender, but with the weakly developed peristome of C. awaji- 

 ensis, the lunella and closing apparatus generally being similar to 

 that species, and lateral, not ventral as in C. aurantiaca. Whorls 

 about 10 ; color greenish-brown, when unworn. Length 11.5, diam. 

 2.7 mm. Kashima, Harima. Types no. 79133 coll. A. N. S. 

 (30f>a of Mr. Hirase's register). 



Clausilia hokkaidoensis n. sp. About the size and general form of 

 C. monelasmus, with which it occurred. Whorls about 10, the last 

 two striate. General characters of the aperture as in C. sub aurantiaca, 

 the subcolumellar lamella deeply immersed, closing apparatus lateral, 

 the upper palatal fold well developed, not connected with the straight 

 low lunella ; no lower palatal fold. Much smaller than the allied 

 C. subaurantiaca. Length 11, diam. 2.5 mm. Kayabe, Ojima, 

 Hokkaido I. Types no. 79321 coll. A. N. S. (546 b of Hirase's 

 register). 



Clausilia ibtaptyx var. clai-a n. v. General form of Cl. iotaptyx, 

 the spire being abnormally thick above, though attenuated for half 

 the length of the shell. Whorls 12, the last with a crest or ridge be- 

 hind the peristome. Superior lamella moderate, inferior receding, 

 not visible in a front view, subcolumellar emerging. Principal plica 

 long, upper and lower palatal plica?, developed, a rudimentary lunella 

 between them, not connected with the upper plica. Length 12.5, 

 diam. 2.8 mm. Senzan, Awaji Island. 



