SOWERBY : NEW MOLLUSCA FROM VARIOUS LOCALITIES. 7 



Many years ago three specimens of this form were presented to our 

 "National Museum by Dr. J. Gwyn Jeffreys, and in 1879 described 

 by Mr. E. A. Smith as a variety of iV. siquijorensts, but without 

 varietal name. I think it should liave a name, and that the differences 

 are sufficient to separate it specificidly. 



The chief differences are as follows : — 



N. siquyorensis. — Suture distinctly channelled. Longitudinal riblets 

 comparatively smooth. Spiral sculpture consisting of slightly de- 

 pressed sulci. 



iV. euglypta. — Suture not channelled. Spiral sculpture, distinct 

 lirae passing over the longitudinal riblets, and forming raised nodules 

 at the points of intersection. 



Vertagus comptus, n.sp. 

 Testa elongata, pura alba, irregulariter parce varicosa; spira 

 leviter convexa, acuminata, ad apicem acutissinia ; anfractus vix 

 convexi, spiraliter leviter lirati, plicis longitudinalibus numerosis fere 

 laevibus instructi ; anfractus ultimus ^ longitudinis testae vix ajquans, 

 subglabratus, plicis partim evanidis, infra conspicue uniliratus, ad 

 basin concavus; rostrum breviciiluni, valde recurvum; apertura 

 latiuscula, intus glabra ; columella oblique rectiuscula, biplicata. 

 Long. 29, maj. diam. 10 mm. 



Hah.— lleil Sea. 



The nearest ally to this species is V. lineatus, from which it differs 

 in being of a uniformly smaller size, in the comparative smoothness of 

 its whorls, its much less prominent plicae, and the absence of colour 

 lines. Some specimens, however, of V. lineatus are destitute of lines. 



