1908.] NATURAL SCIENCES OP PHILADELPHIA. 567 



regularly rib-striate, about four strise in one mm. on the last whorl, 

 the interstices of the striae minutely, finely striate transversely. Three 

 or four early whorls are of about equal diameter; the penultimate whorl 

 is largest, the last whorl compressed and tapering downward. The 

 spiral and inferior lamellae are very long, extending inward past the 

 front to the left side; other lamellae as in japonica; two palatal plicae, 

 an upper and a lower, below the principal plica. 



Length 29.3, diam. 5.5 mm.; whorls 13^. 

 27, " 5.2 " " 13. 



Nakamura, Oki. Types No. 95714 A. N. S. P., from No. 1566 of 

 Mr. Hirase's collection. 



This is a very distinct race, quite unlike any of the many forms of 

 C. japonica known from the main island and Shikoku. Like the 

 preceding subspecies it is probably confined to the Oki Islands. 



Clausilia Mckonis "Kobelt" Bttg. 



Clausilia hickonis Kobelt, Boettger, Jahrb. d. D. Malak. Ges., V, 1878, p. 



55, pi. 3, fig. 7; with var. binodifera Bttg., I.e., fig. 76 (interior of Nippon). 

 C. hickonis Kobelt, Fauna Japonica, p. 86. 

 Clausilia snbjaponica Pilsbry, Proc. A. N. S. Phila., 1900, p. 679 (Jan. 28, 



1901) (Ibuki, Omi). 

 Clausilia fultoni subsp. davula von Moellendorff, Nachrbl. d. D. Malak. 



Ges., April, 1901, p. 41 (Ibuki, Omi). 



This fine Stercophcedusa has some resemblance to C. (Megalophce- 

 dusa.) vasta. It is now known from Hakusan, Kaga; Kurozu and 

 Tomisato, Kii; Ibuki, Omi; and on Shikoku from Nagaomura, Sanuki. 



The variety C. hickonis saucia Pils. differs chiefly by its much 

 coarser striation. It was described from Sodayama, Tosa, and smaller 

 examples have been taken at Naarimura, Tosa, No. 1010 of Mr. 

 Hirase's collection, 83901 A. N. S. P. 



Clausilia jacobiana jacobiella n. subsp PI. XXXI, figs. 3, 4, 5, 6. 



The shell is more slender than C. jacobiana; and the last half of the 

 last whorl is less coarsely striate. There are short upper and lower 

 palatal plicae, but no lunella (pi. XXXI, figs. 3, 4, 5). 

 Length 14.8, diam. 3.0 mm. ; whorls 9^. 

 13.0, " 3.0 " " 9. 



12.7, " 2.9 " " 8+. 



Akusekijima, Osumi. Types No. 95682 A. N. S. P., from No. 1547 

 of Mr. Hirase's collection. Also Nakanoshima and Suwanosejima. 

 Specimens from Nakano-shima are a little larger : 

 Length 15.2, diam. 3.4 mm., whorls 9. 

 14.9, " 3.6 " 

 14.3, " 3.25 " ■ 



