THE NAUTILUS. 95 



The group comprising N. peruana (Trosch.), N. slosarskii 

 (Lub.) and N. flachi Bttg. is a rather intricate one, the species 

 being closely related and likely to give trouble as more races 

 turn up; but the striation of the new one, very much more 

 spaced than in the specimens of these three species compared, 

 appears to make another race necessary. 



Two forms I have not seen, Clausilia granulosa Sykes and C. 

 s. rosenbergi Prest. are placed in the synonymy of N. flachi by 

 Boettger, in his latest consideration of the subject (Nachr.-bl. 

 D. M. Ges., 1910, 77). These two and N. flachi are from 

 Chanchamayo, Peru. 



Nenia bryantwalkeri n. sp. PI. 2, figs. 4, 5, 12-14. 



The shell is fusiform with entire summit. Color undeter- 

 mined, as the type is bleached. Sculpture of slender, widely 

 separated riblets, 5 riblets and intervals in 1 mm. on the face 

 of the last whorl. On the neck they became closer. The 

 whorls are quite strongly convex, the last becoming free and 

 descending more rapidly, the neck rounded. The aperture is 

 carried a little forward, vertical, ovate, with strongly expanded 

 peristome. The superior lamella is strong, vertical, concave on 

 the left side, continuous with the spiral lamella, there being no 

 bend or sinuosity marking their junction. The inferior lamella 

 is inconspicuous in a front view but rapidly becomes high 

 within, penetrating to the mid-ventral line. The principal 

 plica is half a whorl long, dorsal in position. The lunella is 

 strong, subdorsal in position, strongly arched. 



Length 15, diam. at penult whorl 3.4 mm.; 7-| whorls. 



The clausilium is thickened along the oblique distal end, and 

 pointed at the palato-distal extremity. There is a quite small 

 excision at the filament. 



Province of Huallaga, Peru. Type in the Bryant Walker 

 collection. 



This species is probably nearest to Nenia filocostulata (Lub.), 

 a decollate species retaining 8 whorls, with a length of 17 mm., 

 according to Lubomirski, or having 7 whorls, length 15, diam. 

 3 mm. in a specimen measured. Besides the constant decolla- 

 tion, it differs from our new form by the unevenly spaced cos- 

 tulae, less swollen shape and longer neck. 



