0-j4 ANALYTICAL INDEX. 



CHAPTER XII. continued. 



The appearance of the St Andrew's Cross on its back, PAGE 266 



Plate XXXVI. explained, .... ib. 



14. CERCAEIA, ...... ib. 



Animal described, ..... ib. 



Plate XXXVI. explained, . . . . ib. 



CHAPTER XI. GASTEROPODES. 



Introductory remarks, ..... 267 



Subjects of this chapter nearly akin to the Limacine tribe, . ib. 



Aplysia, or covered branchiae, the Doris, or naked branchiae, 268 



APLYSIA DEPILAUS, The Sea Hare, . . . . ib. 



Found under stones on the sea-shore resembles the Limax, ib. 



Description, ....... ib. 



Account of specimens, . . . . . ib. 



Food, . . . . . .269 



Plate XXXVII. explained, . ib. 



THE DORIS, . . . . . . . 270 



Old section established as the Doris subdivided, . . ib. 



Perhaps some links awanting to connect the chain, . . ib. 



General observations on the sections Tritonia, Eolis, and Doris, ib. 



Basis of arrangement, . . . . . ib. 



Features of the tribe described, .... ib. 



SECTION I. TEITONIA, . . . . . .271 



General description, .... ib. 



1. TRITONIA HOMBERGII Homberg's Doris, . . ib. 



The giant of the race, .... ib. 

 Rarity of adults having attained full dimensions against 



observation, ..... ib. 



So is the sluggish disposition of the animal, . . 272 



Very imperfectly represented, ... ib. 

 Cuvier, Delle Chiaie, De Blainville, and others, fail to 



illustrate their own commentaries, . . ib. 



Full grown specimens of Homberg's Doris described, ib. 



Great difference prevails in colour and general aspect, 273 

 Eyca not perceptible, according to Cuvier, unless perhaps 



by dissection, .... ib. 



