XLIII 



DESCRIPTION OF A NEW CRUSTACEAN (PYGOCE- 

 PHALUS COOPERI, HUXLEY) FROM THE COAL- 

 MEASURES. 



Quart. Journ. of the Geol. Soc, vol. xiii., 1857,//. 363-369. 

 Plate [XXIX.]. 



The following account of a very remarkable new Crustacean has 

 been drawn up from the examination of three specimens, two of 

 which are the property of R. S. Cooper, Esq., of Bilston, while the 

 third belongs to the Manchester Museum. The last-mentioned is 

 the most perfect, and may therefore be conveniently described first, 

 as No. I (PL XIII. [XXIX.], fig. i). 



It was obtained from the coal-shales at Medlock Park Bridge, 

 and consists of an ironstone-nodule split into two pieces, a larger 

 and a smaller. The face of the latter exhibits a relief of the fossil, 

 while the opposed surface of the larger piece presents the corre- 

 sponding cast. Exclusive of the appendages, what we may call the 

 body of the fossil (fig. i a) measures about i\ inch in length, and 

 has a width of rather more than |ths of an inch at its widest part. 



The one end of the body (fig. i b, c) is much broader than the 

 other, and has the form of a semicircular disk, the base of the semi- 

 circle forming the widest part of the body, and being about half an 

 inch distant from the summit of its curve. 



The opposite end has the appearance of a quadrate disk (a), about 

 yV inch long ; and between this quadrate disk and the semicircular 

 disk just described lies the central portion of the body (6) divided 

 into a series of segments. Two pairs of appendages, one large (2') 

 and one (/'), small are attached to the extremity of the quadrate 

 disk, while a number of slender limbs are connected with the sides 



