The Nautilus. 



Voii. XV. 



SEPTEMBER, 1901. 



No. 5. 



A NEW JAMAICAN ADAMSIELLA. 



KV .1. B. HENDERSON, JR. 



Adamsiella 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 

 1'iirve. Apex truncate ; 

 sutures well impressed. 

 Sculpture consists of 

 ii ii e v enl y-sp a ced, 

 promi n en t ly-raised 

 lamina 1 circling all the 

 \\ In iris ; these are 

 crossed by obsolete 

 spiral lira? 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. '.I; diain. of 

 aperture 3 mm. 



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

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

 evidences of spiral stria 1 , also by the striking projection of the !;i-t 



