ANALYTICAL INDEX. 



279 



CHAPTER III.— continued. 



Eeproduction of the shell, . . . . • page 185 

 Numerous young burst their capsules, .... 186 



Exuviation sometimes very suddenly, . . • 187 



Chief breeding seasons, April and May, . . . ib. 



This species somewhat rare, .... 188 



Plates XLIII., XLIV., explained, . . . . ib. 



§ 5. Cancer (Pinnotheres) veterum, . ■ ■ 189 



One of the smaller animals inhabiting the Scotish seas, . ib. 



Associates with the Mytilus modiolus, ... ib. 



Dr Leach, Mr W. Thompson, and Mr T. V. Thompson, . ib. 



Enters some bivalve shell and dwells in peace with the owner, 190 



Size, appearance, and organs, . . • . ib. 



Propagation of young, ..... ib. 



Plate XLV. explained, . . , • .191 



§ (1.) Cancer (poecellana) longicornis, — The Ventilating Crab, ib. 



Smallest of the Scotish crabs, . . . . ib. 



Its form, organs, &o., ..... ib. 



Extraordinary development, the p€(?2paZp«, • • .192 



This species very tranquil, . . • • ib. 



Food, perpetuation, &c., . . • • . ib. 



Plate XLV. explained, ..... ib. 



§ (2.) Cancer (porcellana) platycheles, — Rough-footed Crab, . 193 



Form, organs, food, &c., . . . . • ib- 



None of the specimens ever fed, . . • . ib. 



Plate XLV. explained, ..... ib- 



C . — Cancer (corystes) Cassivelaunus, . . - . ib. 



Form, &c., described, . . . • • "^• 



Dwells in deep water, and rarely seen, . . . ib. 



Plate XLVI. explained, ..... ib. 



General remarks on Crustaceans . . • .194 



D. — 1. Cancer (inachus) Dorsettensis, ... ib. 



Form so marked as not to require description, . . ib. 



Specimens dwell together in peace, ... ib. 



D. — 2. Hyas araneus. 



195 



Dr Leach — two British species, Hyas araneus and Hyas coarctatus, ib. 



