Dr. H. Woodward — A Neio Greensand Crab. 303 



and the centre is divided by a mesial furrow, and transversely by 

 a well-marked cross-furrow ending in a notch upon the lateral 

 border (a, a). The metagastric lobe is marked by two triangular- 

 shaped swellings on either side of the mesial furrow, with their 

 convex borders directed outwards and their points downwards ; 

 at the point of each swelling is a round pore, one being placed 

 on either side of the mesial line : a transverse furrow divides 

 the metagastric swelling from two others, marking the urogastric 

 prominence. These have an indented, V-shaped furrow dividing 

 them in the centre. Behind the gastric region is a lesser single 

 median prominence marking the cardiac region, having two small 

 subcentral puncta on it. On either side, -occupying about one-third 

 of the breadth of the lateral border of the carapace, is placed the 

 branchial region. This is marked by a reniform swelling, and 

 is divided from the hepatic region on the latero-anterior margin by 

 a deep rounded notch {a, a), and by the great median transverse 

 furrow which here crosses the cai'apace from side to side. The 

 hepatic region is smooth and not elevated ; the margin is marked by 

 a single spine on the latero-anterior border, indicating the outer 

 angle of the orbit. The rostrum is blunt and has a broad furrow 

 down the centre, dividing the frontal region into two raised 

 prominences. 



The general surface of the carapace is smooth and devoid of 

 tubercles and rugosities, and it is not quite certain in its present 

 state of mineralization whether the outer layer may not have been 

 removed. In any case, the divisions of the carapace are so distinct 

 as to render it capable of determination, and in its present condition 

 this form of Necrocarcinus may conveniently bear the trivial name of 

 JS^. glaber. 



Necrocarcinus gJaber, sp. nov. Twice nat. size. 

 From the Greensand Chert Beds, Baycliffe, near Maiden Bradley, Wilts. 

 Since the above was written Mr. Scanes has sent up another 

 broken specimen, identical with the above, and in the same condition, 

 so that we may justly conclude that they show the actual surface of 

 the carapace. Mr. Scanes has kindly presented the specimen here 

 figured to the British Museum (Natural History), to be preserved in 

 the Geological Department. 



