ANALYTICAL INDEX. 285 



CHAPTER lY.— continued. 



Form, size, &c., described, .... page 244 



Its shell reproduced, . . . . . ib. 



Dwells in still, fresh waters, .... ib. 



Breeds in September and October, . . . . ib. 



Plates LXIL, LXX., explained, . . . 245 



Cypris Forthensis, . . . . . . ib. 



Inhabits the Forth, ..... ib. 



Colour and action, ...... ib. 



Plate LXX. explained, .... ib. 



CHAPTER v.— Parasites, ...... 246 



Man incapable of determining the cause and use of everything, ib. 



§ 1. Calious curtus, ...... ib. 



This one of the plagues which nature permits, . . ib. 



Form and organs described, .... 247 



Plate LXVI. explained, ..... ib. 



Descriptions of authors — MUller, Baster — discordant, . ib. 



Organs farther described, ..... 248 



Pish, especially the Cod, infested by it, . . ib. 



Itself infested by a minute white leech, . . . ib. 



Embryos, . . . . . . " 249 



Undergoes a change in its progress to maturity, . . ib. 



Shell frequently speckled red, .... ib. 



§ 2. Caucus salmonis, ...... ib. 



This parasite said to infest the Salmon, . . ib. 



Size, form, &c., ...... 250 



Plate LXVII ib. 



§ 3. Caucus, ....... ib. 



Mentioned as a distinct species in the work of Mr Adams, ib. 



Plate LXVI. explained, . . . . . ib. 



Lernjea ...... 251 



Lern^ea branchiaus, . . . . . ib. 



A most destructive parasite, .... ib. 



Description, ...... ib. 



Plate LXXVI. explained, .... 252 



§ 4. BOTRYLLOFER, ...... ib. 



Doubtful whether a Crustacean and a parasite, . . ib. 



