CIRCULAR CRAR. 



153 



DEC APOD A. 



BRACHYURA. 



CORYSTID^E. 



CIRCULAR CRAB. 



Atelecyclus heterodon. Leach. 



Specific Character. Carapace nearly circular, the lateral margins with nine 

 teeth, alternately larger and smaller; hairs of the legs very long. 



Cancer (hippo) septemdentatus, MONTAGU, Trans. Lin. Soc. XI. t. 1. f. i. 

 Atclccydm LEACH, Edin. Encycl. VII. p. 430. Trans. Lin. 



Soc. XT. p. 313. 

 heterodon LEACH, Malac. Brit. t. ii. 



THE general form of the carapace of this species is so 

 nearly circular, as to distinguish it at first sight from all the 

 other brachyurous Crabs of our coast. The lateral margins 

 with the front form somewhat more than a semicircle, and 

 the latero-posterior margins form three sides of a nearly 

 regular octagon. The whole circumference is fringed with 

 hair. The lateral margin on each side is furnished with 

 nine teeth, which are alternately a little smaller and larger; 

 the front is tridentate, the middle tooth being rather the 



