ANALYTICAL INDEX. 281 



CHAPTER III.— continued. 



April the chief breeding season, . . . page 206 



Plates LIII., LIV., explained, . . . .207 



§ 2. Galathe* spinigera, — The Thorni/ Bastard Lobster, . ib. 

 One of the most beautiful, curious, and symmetrical of the tribe, ib. 



Form, size, organs, &c., described, . . . 208 



Motion singular and vehement, . . . . ib. 



Propagation, ...... 209 



Exuviation, , . . . . .210 



This species presumed to be migratory, ... ib. 



Plate LV. explained, . . . . . ib. 



B. — Decapodes, ten-limbed, long-tailed, Crustaceans, — Mackouri, 



AsTACUS, the Lobster, . . . .211 



The form of this genus differs considerably from that of the Crab, ib. 



§ 1. AsTAcus NoRVEGicus, Limiwus, Norwegian Lobster, . ib. 

 Beautiful, lively, and active creature, — perhaps migratory, 212 



Fabricius, Fauna Groenlandica, . . . . ib. 



The animal described, ..... ib. 



The ovarium, ...... 214 



Plate LVI., LVIL, LXX., explained, ... ib. 



Called the Cray fish by fishermen, . . . . ib. 



Fresh water Cray fish not natural to Scotland, . . 215 



From the ova Rathke traced the progress of the embryo, . ib. 

 Said to dwell chiefly in muddy streams, . . ib. 



§ 2. Astacus MARiNus, — The Common Lobster, . . . ib. 



Though familiar its history little known, . . ib. 



History and description of specimens, . . . ib. 



Ova, ....... 216 



Mr Gillespie Graham, — gigantic claw, . . . ib. 



Lobster fishing in the Western Isles for the London market, ib. 



Plates LVIIL, LIX., explained, . . . .217 



§ 3. Crangon, — The Shrimp, ..... ib. 



Learned authors say little of the Shrimp, . . . ib. 



Size, form, &c., ..... ib. 



Lively creature, and very tame, .... 218 



Carnivorous, ...... ib. 



The shell often cast, but without any preliminary indication, ib. 



