Dr. L. Moysey — Coal-measure Arthropods. 



499 



is bilaterally symmetrical, and consists of two broad alee, which, are 

 divided up into irregular, more or less concentric areas, by three 

 ill-defined radiating ridges. They are separated from one another by 

 a well-marked median ridge which at one end divides into a deep V. 

 A broad transverse ridge divides the expanded alse from the other 

 portion of the fossil, which consists of two concave elongated areas, 

 which terminate in a couple of short blunt spines. There are also to 

 be seen on each side the median ridge a pair of semi-lunar dots with 

 their concavitv directed towards the median line. 



FlG. 2. ? Glabellar region of Prestwichia. Coal-measures: Shipley, 

 near Ilkeston, Derbyshire. Nat. size. 



This puzzling specimen is capable of various interpretations ; possibly 

 the best is that it is the glabellar region of a Prestuichia. The 

 presence of the pair of dots, one on each side the median line, is in 

 favour of this theory, on the assumption that they are the larval 

 eyes of the animal. 



Fig. 3. 



Terminal segments of air-breathing Arthropod. Kilburn Coal : 

 Trowell Colliery, Notts. Twice nat. size. 



Pig. 3, Air-breathing Arthropod, indet. A small fragmentary fossil 

 found in a nodule from the roof shale of the Kilburn Coal, Trowell 

 Colliery, is also very puzzling. It shows what appears to be the 

 terminal moiety of a segmented animal, with thick and possibly 

 calcareous integument. 



The ultimate segment is perfect, and consists of a shield-shaped 

 plate about 1£ times as broad as long; convex from side to side and 



