﻿178 DEVONIAN FAUNA. 



Size. — A specimen in Mr. Vicary's Collection measures 90 mm. in height, 

 and 33 mm. in width. 



Localities. — Wolborough, Chudleigh. There are two specimens from Wol- 

 borough in Mr. Vicary's Collection, and two from the same locality in the 

 Museum of Practical Geology, one of which is Phillips's figured type. There are 

 also two specimens in the Museum of Practical Geology, which are Phillips's 

 types of his species L. prseteritum. 



Remarks. — This is a very well-defined and large species. Phillips's original 

 specimen is of a comparatively small example, and other specimens are much 

 larger, and show that the shell-structure generally became extremely massive in 

 old age. Phillips's figs. 187 a and b of his L. prasteritum are very roughly and 

 inaccurately drawn. The two specimens are moulds in relief lying in slabs, in 

 which the outline of the shell itself is marked by a white line of calcareous spar, 

 which from its position seems to give an exaggerated appearance of thickness to 

 the shell-structure. They present few points available for specific determination, 

 but as far as can be seen they so closely resemble the other specimens of L. 

 reticulatum that I have little doubt of their belonging to the same species. 

 Phillips's third figure of his L. praeteritum, which is in the same Museum, is from a 

 poor and crushed specimen of a much smaller shell from Hope's Nose, and I am 

 at present inclined to regard it as specifically distinct. 



Goldfuss gives the name of Melania deperdita to a large cast which seems to 

 me to correspond with the casts of this species. 



Macrochilus striatus, Eichwald, is described from a single fragmentary specimen, 

 which appears to be just similar to the upper whorls of the English shells. 



The large casts of Loxonema figured by Tschernyschew are very similar, but 

 are perhaps more elongate with fewer whorls. They are, however, apparently 

 much distorted. 



One of Mr. Vicary's specimens, though very large, has a comparatively thin 

 shell, and the ornament is much finer than is usual in this species. 



4. Loxonema ? sp. PI. XVIII, fig. 4. 



Description. — Shell of moderate size, spiral, somewhat elongate, conical, of 

 several whorls. Sutural angle rather great, variable. Whorls probably five or six, 

 short, convex above, flat below. Suture rather deep. Surface ornamented near 

 the suture with indistinct threads sloping obliquely backwards. Body-whorl 

 rather large. Mouth somewhat produced below. Shell- structure thin. 



Size. — Height probably about 30 mm., width 12 mm. 



