1900.] NATURAL SCIENCES OF PHILADELPHIA. 447 



whitish at the edge. Superior lamella rather low, vertical, attain- 

 ing the margin, widely disconnected from the spiral lamella. In- 

 ferior lamella immersed, scarcely visible in a front view, strong 

 and vertical within. Subcolumellar lamella emerging, continued 

 to the edge of peristome. Principal plica about a half-whorl 

 long, visible within the aperture. Upper palatal plica very short, 

 slightly united with the nearly straight, oblique lunella, which is 

 lateral in position. Two short sutural plicae developed a little 

 further inward than the upper end of the lunella. Spiral lamella 

 and inferior lamella of equal length within, a rather long lamella 

 fulcrans and a lamella parallela developed, each standing free. 

 Clausilium rather narrow, parallel-sided, bluntly tapering at 

 the apex. 



Length 10, diam. 2.2, length of aperture 2.1 mm. 



Loo Choo Islands (Mr. Y. Hirase). 



This slender, dark-colored Hemiphcedusa is a beautiful little 

 species, distinguished by the two sutural plicse and the development 

 of a fulcrum and parallel lamella, as in C. Hirasei. It differs 

 from that species in the dark color, attenuated and concave spire, 

 stronger superior lamella, and various other details of the closing 

 apparatus. 



C. Hirasei and C. hyperoptyx form a new group of Hemi- 

 phcedusa characterized as follows: 



Superior lamella widely separated from the spiral lamella ; a 

 fulcrum and parallel lamella present; sutural plicse developed; 

 upper palatal plica independent or united with the well-developed 

 lunella; no lower palatal plica. 



Just what relation this group holds to Dr. von Moellendorft's 

 group of 0. sublunellata I do not know, but as he does not 

 describe the complicated closing apparatus I find in my species, I 

 presume it to be quite different. 

 Clansilia japonica var. surugae, n. v. PL XIV, fig. 4. 



Similar to C. japonica but smaller, strongly attenuated above 

 for a longer distance, the aperture smaller with rather stronger 

 principal lamella; upper palatal fold shorter, the lower palatal 

 short or obsolete. 



Mikuria, Prov. Suruga (Mr. Y. Hirase). 



Having examined some hundreds of specimens of C. japonica 

 from several localities, collected by Mr. Stearns, Mr. Hirase, 



