68 



CANCERIDJ^. 



DEC APOD A. 



BRACHYURA. 



CANCERIDjE. 



Pilumnus Mrfellus. Leach. 



Specific cJiarader. — Superior margin of the orbit not spinous, but, with tlie 

 front, minutely denticulated ; latero-anterior margin armed with four spines (ex- 

 clusive of the external angle of the orbit) ; hands slightly tuberculated. 



Cancer Mrfellus, Linn. Syst. Nat. I. 1045. Penn. IV. t. yi. f. 1. p. 9, 



Pilumnus „ Leach, Trans. Linn. Soc. XI. p. 321 ; Malac. Brit. t. xii. 



Edwards, Hist. Crust. I. p. 417. 



The carapace is smooth, anteriorly much incurved ; its 

 length to its breadth, as seven to ten ; the front broad, 

 finely toothed, divided in the centre by a deep fissure ; 

 the latero-anterior margin evenly arched, furnished, ex- 

 clusive of the outer angle of the orbit, with four strong- 

 sharp spines, the anterior two being frequently bifid ; the 

 hinder one the strongest, and in a line with the posterior 

 part of the gastric region. The upper margin of the orbits 

 very minutely toothed ; the lower margin spinous, and in 

 each a small fissure. The anterior pair of legs are remark- 



