or 
354 ANALYTICAL INDEX. 
CHAPTER XII.—continued. 
The appearance of the St Andrew’s Cross on its back, PAGE 266 
Plate XXXVI. explained, : : é : ib. 
14, CEeRcARIA, c : : ; 0 : ib. 
Animal described, : : 2 : 2 ib. 
Plate XXXVI. explained, . : - : ib. 
CHAPTER XI.—GASTEROPODES. 
Introductory remarks, : : 267 
Subjects of this chapter nearly akin to the iaraneine tribe, : ib. 
Aplysia, or covered branchize,—the Doris, or naked branchiz, 268 
AptysiA pEpiLaus,—The Sea Hare, . 5 ib. 
Found under stones on the sea- shike 2 cesombles the iin, ib. 
Description, . : é ; : : 5 ib. 
Account of specimens, 3 ; : ; ‘ ib. 
Food, : : - ; ; 269 
Plate XXXVIL caplinedl : F j : ib. 
Tue Doris, . : : 270 
Old section ontahishe! as the Dons 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, é : - . ib. 
Section I.—Tritont, ; : ; : ; , 271 
General description, F 2 : : ib. 
1.—Trironta Homsereu—Homberg’s Doris, : : ib. 
The giant of the race, : ib. 
Rarity of adults having attained full dimensions sean 
observation, . . c 5 ib. 
So is the sluggish aiuposition of the animal, . 3 272 
Very imperfectly represented, : ib. 
Cuvier, Delle Chiaie, De Blainville, and other: fail to 
illustrate their own commentaries, i ib. 
Full grown specimens of Homberg’s Doris beotbed: ib. 
Great difference prevails in colour and general aspect, 273 
Eyes not perceptible, according to Cuvier, unless perhaps 
by dissection, : : 3 : ib. 
