EUOMPHALUS. 53 



in section, very convex at the shoulder, gently convex on the back. Sutures deep 

 not wide. Umbilicus very large, and moderately shallow. 



Size. — Approximate measurements : width 6 mm., height 2*5 mm. 



Localities. — In the Barnstaple Museum are four specimens from Fraukmarsh, 

 one from Kingdon's, Shirwell, and two from Vicarage Well. In the Porter 

 Collection are several specimens from Pilton ; in the Museum of Practical Geology 

 one from Brushford ; in my Collection one from Frankmarsh ; and in Mr. 

 Hamling's Collection, one from the Kiln, Croyde Bay. 



Remarks. — These shells evidently belong to one of the species included by 

 Phillips under the name Eit. serpens, viz. that represented by his figures 172 c, d, e. 

 They are perfectly distinct from the much larger species which is common in 

 South Devon, and which is, as I believe, generally regarded as Eu. serpens^ 

 although Phillips's description had evidently chief reference to the present shell. 

 To that larger species I have, therefore, proposed to restrict Phillips's name ; and 

 consequently it is necessary to find some other term for the Pilton form. 



This species is distinguished by its uniformly small size, by its spire being 

 definitely, though slightly, elevated above the body- whorl, and by the section of 

 its whorls being almost subangular, and as long or longer than wide. It shows 

 very little variation in size or general shape. It is decidedly gregarious ; upon 

 one small slab I have counted seven specimens. But, though evidently very 

 common, I have not been fortunate in obtaining good specimens for figuring, and 

 the one which I have had drawn is a small imperfect cast, not giving specific 

 characters as definitely as could be wished. 



Affinities. — It differs from all the South Devon forms in other points beside 

 size. Its spire is more elevated than that of Fliiloxene Isevis, and less so than that 

 of Eu. Dionysii. 



2. EuOMPHALUS, Sp. 



RemarJcs. — In the Barnstaple Athenffium is a large specimen about 15 mm. in 

 diameter from Vicarage Well, Pilton, which is too imperfect for specific deter- 

 mination, but appears to be quite distinct from the small species common in 

 these beds. Only three fourths of the outer whorl remain. It appears to be 

 discoidal in shape, to have a sunken spire, and to be perfectly circular in the 

 section of the whorls. 



