GIBBS S SPlDER-CHAIi. 



27 



DEC A POD A. 

 BRACHYURA. 



MAI AD ft. 



a 



GIBBS'S SPIDER-CRAB. 



Pisa Gibbsii. Leach. 



Specific character. No spines on the lateral margin. A strong spine on each 

 branchial region, and a large prominent tubercle just above the posterior margin of 

 the carapace. 



Cancer bmculcatus, 

 Pisa 



Gilbsii, 



MONTAGU, Linn. Trans. XI. t. i. f. 2. p. 2. 



LEACH, Edinb. Encycl. VII. p. 431. 



Id. Trans. Linn. Soc. XI. p. 327. Malac. Brit. t. xix. 



EDW. Hist. Crust. I. p. 307. COUCH, Cornish 



Fauna, p. 65. 



THE general form of the carapace in Pisa Gibbsii is very 

 different from that of P. tetraodon. The rostrum is much 

 longer, being not less than half the length of the rest of 

 the shell, and its two horns, in the male, are parallel 

 throughout almost their whole length ; but in the female 



