350 ANALYTICAL INDEX. 



CHAPTER IX. continued. 



More than mere instinct displayed, . PAGE 221 



Tubes extending two feet generally ruptured below, ib. 

 Difficult to dislodge the animal, .... 222 



Experiments described, ... 



Origin of their dwelling extremely obscure, . . 224 



Regeneration of the branchire, .... 225 



Thirty-four days after mutilation the animal became bold and vigorous, 226 



Other specimens mutilated, .... 227 



Vivian, an Italian naturalist, . ib. 



Number of branchiae constantly advancing with age, . 229 



Mviller's Danish Zoology, ..... ib. 



Naturalists have perhaps overlooked the real antennulse, . 230 



May be subject to natural mutilation, ... ib. 



History of a specimen, . . . ib. 



Unequal distribution of vitality merits attention, . . ib. 



Possesses a principle of powerful regeneration, . . ib. 

 Remarkable that a fragment from the posterior should generate the 



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 . ib. 



A disordered plume indicative of disease, . . . 234 



Progeny, . . . . . . ib. 



Conclusions to be deduced from the preceding detail, . . 235 



Plate XXX. explained, ..... ib. 



2. AMPIUTRITE BOMBYX, ..... 236 



This animal resembles the preceding, ... ib. 



Name derived from the silken texture of the sheath, . . ib. 



Its form and organization described, . . . ib. 



Plume larger than that of the Amphitrite ventilalrum, . 237 



Tube not of mechanical construction, ... ib. 



Secretion by which it is produced must be copious, . . ib. 



Reproduction of the sheath, .... 238 



A gentle pressure upwards induces it to quit its tube, . . ib. 



Timid creature, and impatient of light, ... ib. 



Branchial apparatus united to the body by a thin skin, . ib. 



Perpetuation account of specimens, ... ib. 



Reproduction account of specimens, . . . 239 

 Proved that the elements of the branchial plume reside in different 



parts of the bod}', . . . . 242 



Theory of reproduction embarrassing, . , . 243 



