GASTEROPODA. 85 



partaking, however, of a portion of the characters of the three Crag species, carinatus yet 

 differs from all of them. A. striatus is finely striated, without carina? ; A. supranitidus is 

 smooth, with one to three sharp carina?, and coarsely striated within the umbilicus ; and 

 A. tricarinatus has three very elevated carina?, with striations between them. These are 

 the characteristics of the three Crag species, but A. carinatus from the Oligocene has 

 three carina?, of which two are more conspicuous than the third, and all are less elevated 

 than in tricarinatus, while the recent A. Buminyi is described as having eight to ten 

 sharp and narrow stria? on the upper part of the whorl, the lowest of which, being more 

 prominent, forms one faint carina. A. tricarinatus is certainly nearer to the Oligocene 

 species than to any other, but yet is, I think, distinct, the carina? being so much more 

 elevated. We have here five different forms, and I see no reason for not retaining my 

 three Crag species under the names I gave them. Dr. Speyer unites Philippi's dubius 

 with carinatus. 



Solarium vagum, S. Wood. Supplement, Tab. VII, fig. 29, a, h. 



Locality. Red Crag, Waldringfield. 



Diameter, \ an inch. 



The figure above referred to represents another shell sent to me by Mr. Canham from 

 the nodule workings at Waldringfield. 



This I have placed in the genus Solarium, as it seems best entitled to that position, 

 though somewhat of an aberrant character. I am unable to refer it specifically to any- 

 thing known to me. The specimen is rubbed and worn, but it was probably, when 

 perfect, nearly, or perhaps quite, smooth on the upper surface, with an obsolete ridge 

 around or above the periphery ; the under side has a moderate-sized umbilicus, edged 

 with a sharp crenated, or rather nodulous, margin, like that of many species in this 

 genus ; its nearest resemblance is Solarium simplex, Bronn, but that species has only one 

 ridge on the under side around the umbilicus, while upon our shell there are three or four 

 spiral stria?. The present shell is the only representative of the genus Solarium that I 

 know of from the Upper Tertiariesof England, and I suspect that it is derived from some 

 older formation, for which reason I propose the name vagum. The shell spoken of as 

 Solarium pseudo-perspectivum, from the mud deposit at Selsea, 1 ' Geol. Mag.,' vol. vi, p. 41, 

 on which the name was founded, is a specimen of Bifrontia Laudinensis, washed into this 

 mud bed from the Eocene formation beneath, where specimens of that species are abundant. 



The genus Phorus is given by Philippi as fossil at Palermo, which deposit seems to 

 belong to the Upper Tertiaries, but I have not seen this genus as fossil from beds newer 

 than the Eocene in England. Mr. Whincopp showed me the cast of a species belonging 



1 This specimen is in the collection of Dr. Reed, of York. 



