THE NAUTILUS. 



VOL. XV. 



SEPTEMBER, 19O1. 



. 5. 



A NEW JAMAICAN ADAMSIELLA. 



BY J. B. HENDERSON, JR. 



Adanisiella jarvisi n. s. 



Shell moderately elongate, pyramidal. Whorls four, well rounded, 

 the last leaving the body of the shell and projecting one-half its own 



length free in a slight 

 curve. Apex truncate; 

 sutures well impressed. 

 Sculpture consists of 

 ii n e v e n 1 y-s paced, 

 prominen tly-raised 

 laminae circling all the 

 \\ liorls ; these are 

 crossed by obsolete 

 spiral lirse which are 

 only apparent at their 



points of intersection with the transverse ridges. Umbilicus narrow 

 and extending through the shell, forming a puncture at the apical 

 truncation. Aperture exactly round; inner peritreme greatly ex- 

 tended; the outer peritreme corresponding to an exaggerated lamina, 

 circles the whorl like a collar, the outer edge of which is irregular 

 but not fluted. Color pale yellowish-gray. 



Height 11 ; diam. above aperture 6.5; greatest diam. '.) ; diam. of 

 aperture 3 mm. 



This species resembles .4. peurnununnn in general shape and sculp- 

 ture, but is obviously distinct by reason of ils coarser lamina 1 and 

 evidences of spiral stride, also by the striking projection of the l ;i ~i 



