1902.] NATURAL SCIENCES OF PHILADELPHIA. 379 



glossy, evenly thread-striate obliquely. Whorls a trifle over 8, 

 convex, the last well rounded beneath. Aperture wide, oval, 

 vertical, the peristome expanded, subreflexed, somewhat thickened 

 within, continuous, in contact with the preceding whorl above. 

 Superior lamella wholly wanting, the spiral lamella arising far 

 within. Inferior lamella forming a small and deeply-placed but 

 prominent subhorizontal fold. Subcolumellar lamella deeply 

 immersed. Principal plica short, dorso-lateral. Moderately long 

 upper and lower palatal plicae are developed (but apparently no 

 lunella). 



Length 12, diam. 3.1, length of aperture 3.2 mm. 



Nachi, Kii. Type No. 82,454, A. N. 8. P., from No. 789 of 

 Mr. Hirase's collection. 



A single specimen of this remarkable Euphcedusa was sent by 

 Mr. Hirase, with the remark that it seemed different from any other 

 species. It stands in the middle between the " group of C. hun- 

 gerfordiana" and that of C. euholostoma, as denned in my last 

 paper upon this topic. Both of these groups have the superior 

 lamella absent or vestigial, represented by a slight thickening of 

 the peristome, and there is more or less whitish, papery cuticle, in 

 streaks and spiral lines. C. holotrema resembles C. hungerfordiana 

 in the palatal armature, but is more like euholostoma in the 

 squarish-oval, not in the least piriform shape of the aperture. 

 The dark, wide, wine-brown belt, contrasting with the corneous, 

 white-variegated band above, makes it a conspicuous species. This 

 belt terminates short of the outer lip, as shown by transparence in 

 the figure. The single specimen received has not been opened, but 

 this is the less essential because the palatal folds show through the 

 thin shell. 



Section STEREOPH^DUSA Boettger. 

 Group of C. una. 



Similar in general characters to the group of C. japonica, but 

 with the right margin of the lip plicate, arid having a short lunella 

 developed in connection with the lower palatal plica ; no interme- 

 diate palatal plicae. 



