1866.] WOODWAED ^ERTON. 499 



carapace behind the nuchal furrow, entering the margin at the latero- 

 posterior indentation. 



A rounded protuberance occupies the centre of the carapace in 

 front of the nuchal furrow, and a small tubercle behind it. There 

 are two lateral furrows upon the branchial region on either side of 

 the mesial ridge. The surface of the carapace is sparingly granu- 

 lated. 



Dimensions. — Length of carapace 2 inches (when perfect) ; 

 greatest breadth 1 inch 10 lines ; width in front 11 lines ; width 

 at nuchal furrow 1 inch 4 Hnes. 



I have named this example after the president of the Warwick- 

 shire Naturalists' Field-club, the Eev. P. B. Brodie, M.A., T.G.S., 

 who has obligingly placed his collection at my service. 



6. Eryon Moorei, spec. nov. PL XXY. fig. 3. 



Those who have visited the Bath Museum (especially during the 

 British Association Meeting in Bath) will remember the fine suite of 

 fossils from the Upper Lias fish-bed obtained by Mr. Charles Moore, 

 F.G.S., of Bath, who has devoted years of labour to the investigation 

 of this and other Jurassic beds. 



Among a number of specimens (including six or seven different 

 species) is the present very perfect httle Eryon, which I have named 

 after its discoverer. 



The original is 14 lines in length, and 6 lines in its greatest 

 width. 



The carapace is smooth and nearly oval, but truncated at its 

 extremities, being 4 lines wide at its posterior border, and 2| lines 

 at its anterior. 



A double furrow, uniting in the centre of the carapace, crosses 

 the entire breadth, diverging at the lateral border, and forming, by 

 two slight indentations, a square central lobe on either side, 1 line 

 in breadth. 



A small projecting tooth marks the shallow orbital depression 

 on either side, while two prominent rostral spines enclose the 

 antennse. 



The forearm (which is the only limb preserved) is, in its entire 

 length, equal to the length of the carapace, of which the slender 

 didactyle extremities form one fourth part. 



The median ridge of the carapace only extends as far as the 

 nuchal furrow. 



The frontal central portion is tumid, and is slightly granular 

 anteriorly. 



The abdominal segments are 4 lines in width, and are strongly 

 grooved transversely, and have their lateral margins granulated. 



The telson is acutely angular ; the side lobes are more narrow and 

 pointed than in the other English species, more closely resembling 

 in this respect E. arctiformis from Solenhofen. 



Eryon Moorei is represented in the Solenhofen Stone by E. Schu- 

 herti of Meyer, from which it differs, however, in the lateral emargi- 

 nations and transverse furrows on the carapace, E. Schnherti being 



