562 PROCEEDINGS OF THE ACADEMY OF [DeC, 



the shell is concerned, a comparison of specimens shows scarcely any 

 difference from the variety defined above from the northeastern 

 Ryukyu Islands, but the clausiliiuii is perceptibly different. It must 

 be admitted that such small differences as exist would not be thought 

 of much significance were it not for the wide geographic separation. 

 Clausilia echo n. sp. PI. XXX, fig. 7. 



The shell is very small, thin, yellow or corneous, sometimes with 

 a few yellow flecks; finely striate, becoming more coarsely so on the 

 back of the last whorl, and under a lens showing 

 faint spiral striae. Penultimate whorl widest, 

 those above tapering to the small, slightly obtuse 

 apex. Whorls 6^ to 7, convex, the last com- 

 pressed laterally, convex below. Aperture squar- 

 ish ovate. Peristome continuous, expanded and 

 reflexed, the upper margin notched over the 

 superior lamella; sinidus retracted. The superior 

 lamella is thin, marginal, separated from the 

 spiral lamella, which is short and lateral. The 

 inferior lamella is deeply placed, forming a promi- 

 nent fold deep in the throat, strongly gyrate within the last whorl, 

 penetrating as deep as the spiral lamella. The subcolumellar lamella 

 is very deeply immersed. The principal plica is very short, lateral. 

 There are small upper and lower palatal plicae. 

 Length 7 to 8, diam. 2 mm. 



The clausihum is rather broad, oval, tapering toward both ends, 

 and very strongly curved. 



Akusekijima, Osumi, Types No. 95688 A. N. S. P., from No. 1585 

 of Mr. Hirase's collection. 



Clausilia echo is a connecting link between Reinia and Ewphcedusa. 

 It resembles C. eastlakeana except in having the peristome complete, 

 the aperture being shaped much as in C. euholostoma Pils., but that 

 species has no superior lamella. C. echo is a less evolved form than 

 C. eastlakeana, in the same phylum. 

 Clausilia variegata (A. Adams). 



Pilsbry, Proc. A. N. S. Phila., 1901, p. 473, pi. 25, figs. 11, 12. 

 The type locality for this species is Tago, Izu (not in western Shikoku, 

 as stated in a former communication). Other localities are Tokyo 

 and its environs, Takasaki, Kozuke; Kashima, near Tanabe, Kii, 

 and Hirado, Hizen. Specimens have been received also from Chichi- 

 jima, Ogasawara. They belong to the typical form of the species, not 

 to the variety nesiotica. 



