CORYSTES CASSIVELAUNUS. 
Tas. I. 
C. testa granulari posticeé subcrenulata; fronte bifido ; lateribus tridentatis 
Cancer Cassivelaunus. Penn. Brit. Zool. iv. 6. tab.'7. mas. et fem. 
Herbst. i. 195. tab. 12. fig. 72. mas. 
Cancer personatus. Herbst. i. 193. tab. 12. fig. 71. fem. 
Albunea dentata. Fabr. Suppl. Ent. Syst. 398. 
Corystes longimane. Latr. Hist. Nat. des Crust. et des Insect. vi. 122. mas. 
Corystes dentatus. Latr. Gen. Crust. et Insect. i. 40. . 
Corystes Cassivelaunus. Leach, Edinb. Encyl. vii. 395. 
Trans Linn. Soc. xi. 311. 
Fig. 1, mas. 2, maris abdomen ampl. 3, Feminz abdomen auct. 4, Femina. 5, Pedi- 
palpus geminus externus. 
On most of the sandy coasts of Great Britain, Corystes Cassivelaunus occurs in great — 
abundance, especially after storms or gales of wind that have been tending towards the shore. 
By Herbst the sexes of this animal were considered as distinct species, and Latreille, in the 
sixth volume of his “ Histoire Naturelle des Crustacés et des Insectes,” entertained the same 
opinion, which he has since corrected in his “ Genera Crustaceorum et Insectorum.”’ 
