350 ANALYTICAL INDEX. 
CHAPTER [Re contented: 
More than mere instinct displayed, . 3 : PAGE 221 
Tubes extending two feet generally ruptured below, : ib. 
Difficult to dislodge the animal, : é : é 222 
Experiments described, . : ; : : 223 
Origin of their dwelling extremely obscure, . : : 224 
Regeneration of the branchiz, : 225 
Thirty-four days after mutilation the animal hecaebell ane vigorous, 226 
Other specimens mutilated, - : : . 227 
Vivian, an Italian naturalist, . . ‘ : ib. 
Number of branchiz constantly advancing ain age, : 229 
Miiller’s Danish Zoology, . é ib. 
Naturalists have perhaps pyarlooked! the roa aren, : 230 
May be subject to natural mutilation, : : : ib. 
History of a specimen, 2 3 5 : 4 ib. 
Unequal distribution of vitality merits attention, . : ib. 
Possesses a principle of powerful regeneration, ib. 
Remarkable that a fragment from the posterior should eherate tite 
complicated organs belonging to the exterior, : : 232 
Denied the power of constructing any but its original tube, ib. 
Perhaps some unknown means whereby a new tube can be constructed, 233 
Proper dimensions of the plume a fourth of the body 3 ib. 
A disordered plume indicative of disease, : . : 234 
Progeny, . : ib. 
Conclusions to be deduced froin the ee Hetsill : c 235 
Plate XXX. explained, . : ; : : ib. 
§ 2. AMPHITRITE BOMBYX, 6 ¢ : 6 236 
This animal resembles the nreeuting: é : . ib. 
Name derived from the silken texture of the sheath, . : ib. 
Its form and organization described, 2 : ib. 
Plume larger than that of the Amphitrite vahttlcirien: 3 237 
Tube not of mechanical construction, : 6 . ib. 
Secretion by which it is produced must be copious, : : ib. 
Reproduction of the sheath, : . 238 
A gentle pressure upwards induces it to de its tiibe, : : ib. 
Timid creature, and impatient of light, : ; ib. 
Branchial apparatus united to the body by a thin din, . ib. 
Perpetuation—account of specimens, 0 : : ib. 
Reproduction—account of specimens, 239 
Proved that the elements of the branchial nite feeide in different 
parts of the body, : : > . : 242 
Theory of reproduction embarrassing, ; 5 5 243 
