﻿230 DEVONIAN FAUNA. 



Locality. — Wolborough. There is a finely preserved specimen in the Museum 

 of Practical Geology, in which, however, the aperture is hidden ; and a poor speci- 

 men in Mr. Vicary's Collection. 



Remarks. — This shell comes very close to Sandberger's figure of his species 

 H. tenui sulcata, Sandberger. It differs, however, from that, and from the English 

 shell with which I identify that German species, in being a much more conical 

 shell, and in having much narrower whorls and coarser ornamentation. Though I 

 was at first inclined to identify it with that shell, it appears to me that the 

 differences are so strongly marked that it must certainly be kept distinct. 



It appears, however, to correspond with another species figured by Sandberger, 

 viz. Loxonema costatum, Goldfuss, MS., except that the lineations are consider- 

 ably finer than those in one of his figures. He, however, describes that as a 

 coarsely ribbed variety, and his other figure shows the lineations to be almost as 

 fine as those of ours. Hence it may be regarded as the same species. He, how- 

 ever, identifies it with H. Hennahiana, Sow., from which it is quite distinct, and 

 also with Melania Kaupii, Goldfuss, 1 which appears to be a totally different form 

 with strong direct ribs and transverse strise. 



Affinities. — This species is very much the shape of H. duplisulcata, but differs, 

 as shown above, in the character of its ornamentation. 



2. Genus. — Scoliostoma, Braun, 1838. 



The shells of this genus are more or less spirally conical, and consist of a 

 nearly circular tube loosely coiled upon itself for the greater part of its length. 

 Their distinctive feature is the sudden deflexion of the body-whorl, which, leaving 

 the regular coiling, is twisted back asymmetrically, so that the mouth sometimes 

 appears midway up the spire, or even above the apex. The peristome is nearly 

 circular, complete, and sometimes thickened. The shell is reticulate and slightly 

 umbilicated. The genus appears to be confined to the Devonian beds. 



The genus Strophostoma, Deshayes, which is referred to the fresh-water family 

 Cijclostomidse, bears very great resemblance to it, especially in the asymmetrical 

 deflexion of the aperture. This genus existed from the Chalk to the Miocene 

 epoch. 



1 1844, Goldfuss, ' Petref. Germ.,' vol. iii, p. 110, pi. cxcvii, figs. 15 a, b. 



