DEC A POD A. 



BRACHYURA. 



.MASKED CRAB. 



159 



CORYSTID^E. 



MASKED CRAB. 



Corystes Cassivelaunus. 



Cancer cassivelaunus. 



11 11 



pcrsonatus 

 Albunca dcntata, 

 Corysles dentatus, 



PENNANT, Brit. Zool. iv. t. vii. p. 6. 

 HERBST, I. t. xii. f. 72. Mas. 



t. xii. f. 71. Fern. 

 FABR. Suppl. 398. 



LATR. Hist. Nat. des Crust, ot Insect. VI. p. 122. 

 EDW. Hist, des Crust. II. p. 148. COUCH, Corn. 

 Faun. p. 74. 

 Cassivelaunus, LEACH, Edinb. Encycl. VII. p. 395. Mai. Brit. t. i. 



THE carapace in this species is longer than it is broad, in 

 the proportion of nearly three to two ; convex, with the 

 regions somewhat distinctly marked, having a groove sur- 



