﻿192 DEVONIAN FAUNA. 



1. Natica? nexicosta, Phillips. PI. XIX, fig. 1. 



1841. Natica nexicosta, Phillips. Pal. Foss., p. 95, pi. xxxvi, figs. 174 a, b. 

 1845. Littoeina biseeialis, de Verneuil. In Murch., Vern. and Keys., Russia, 



vol. ii, p. 340, pi. xxiii, fig. 13. 

 ? 1853. — lirata, Sandberger. Verst. Rhein. Nassau, p. 220, pi. xxv, 



figs. 15, 15 a, 15 b. 

 1854. Natica nexicosta, Morris. Cat. Brit. Toss., p. 263. 

 1857. Litoeina globosa, Eichwald. Bull. Soc. Nat. Moscow, p. 162. 

 1860. Natica globosa, Eichwald. Lethaea Ross., p. 1123, pi. xlii, fig. 20. 

 1870. — nexicosta, Tietze. Dev. Schicht. Ebersdorf, p. 40, pi. ii, fig. 25. 

 1888. — — Etheridge. Foss. Brit., vol. i, Pal., p. 164. 



Not 1813. — F. A. Rbmer. Harz., p. 27, pi. vii, figs. 5 a, b. 



Description. — Shell small, subglobular, pointed, of about three rapidly 

 increasing whorls. Spire short, broadly conical, about one-third the height of 

 the shell. Suture well defined, obtuse. Upper whorls roundly step-like, much 

 enveloped, their width about equal to their height above the suture. Body-whorl 

 very large and capacious, starting obliquely from the suture, rather flatter on the 

 back, and rounding in to form the base of the shell. Ornament consisting of 

 very strong, elevated, steep, subacute, longitudinal ridges, separated by similar 

 furrows, about thirty on the body-whorl, sloping obliquely backwards from the 

 suture, becoming more perpendicular in the back, and again tending rather 

 backwards near the base of the shell, often divaricating close to the upper suture. 

 Base and mouth hidden in the described specimen. 



Size. — Height 12 mm., width 11 mm. 



Locality. — There is a small specimen from Lummaton in the Woodwardian 

 Museum, and a larger specimen in the Battersby Collection of the Torquay 

 Museum, apparently from the same place. I have also seen a specimen in the 

 Champernowne Collection, which I believe to belong to the same species. 



Remarks. — The above description is taken from the shell in the Battersby 

 Collection. It is to be noticed that all the ribs do not start from the suture, but 

 that some either rise or divaricate almost immediately below it. It is almost exactly 

 similar to the South Petherwyn shell to which Phillips gave the name Natica 

 nexicosta, Phillips ; the only difference being that there are no signs of any of the 

 ribs divaricating upwards as his figure indicates, but some of them are shorter, as 

 he mentions, or at least divaricate downwards close to the suture. I do not think 

 that these points are likely to indicate any specific difference, and have no 

 hesitation in placing our shells under Phillips's species ; they are alike in shape, 

 and the number and style of the ribs exactly correspond. 



There is much more doubt whether Littorina lirata, Sandberger, is the same 



