1 !)()).] NATURAL SCIENCES OF PHILADELPHIA. 62-") 



palatal plica narrow, oblique, lateral, well separated from the 

 straight, oblique, low aud narrow lunella. Lower palatal plica 

 subobsolete or wanting. 



Length 18.3, diain. 4.3 mm. 



Length 17, diam. 4.3 mm. 



Clausilium very narrow, parallel-sided, a little excised on the 

 palatal side of the apex. 



Mikuriya, Suruga. Types No. 82,298 Coll. A. N. S. P., from 

 No. 7365 of Mr. Hirase's collection. 



This somewhat club-shaped form is noticeable for its fine stria- 

 tion and pale color. The narrow lunella is longer than in other 

 species of the group which I have seen. C. sericiaa, which has 

 not been figured nor very fully described, seems to be its nearest 

 relative. 



Group of C. aivajiensls. 



This group comprises Hemiphcedusce in which the lateral or 

 latero-dorsal lunella is J-shaped or bow-shaped, its upper end 

 l)eing united to the middle, or sometimes to the lower end, of a 

 short upper palatal plica, the lower end curving inward. The 

 clausilium is typical of Hemiphcedusa, being parallel-sided, not 

 oblique or thickened at the distal end, and usually it is emarginate 

 on the columellar side of the filament. 



The species are numerous on Shikoku Island, and will probably 

 prove difficult to limit when more localities are explored aud fur- 

 ther slightly differentiated races come to light. Others are known 

 from Awaji, western Nippon aud Kiushiu. None have come to 

 my hands from middle or northern Nippon, or from Yesso. 



Species with J-shaped lunella: C. awajiensis Pils., C perigno- 

 bilis and var. koehiemis Pils., C. ii^chna aud var. neptis Pils., C. 

 .iubawantiaca Pils., C. harimensis Pils. and C. higoends Pils. 



Species with bow-shaped lunella: C. ignobllis Sykes, C. shiko- 

 taenf^is Pils. 

 Clausilia higoensis Pilsbry. PI. XXXV, figs. 1, 2, 3, 1. 



Pilsbry, these Proceedings for 1901, p. 499 (October 2, 1901). 



Distinct by its inflated shell, attenuated above, and with a more 

 or less developed wave or crest behind the outer lip. In some speci- 

 mens this is strongly developed (PI. XXXV, fig. 3), much as in 

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