ANALYTICAL INDEX. 
CHAPTER VIII.—continued. 
The nomenclature of Lamarck, Gmelin, and others defective, pace 182 
§ 1. 
mm 
no 
The Terebella and Amphitrite, 
TEREBELLA LITTORALIS, SEU ARENARIA,—The Sand Mason, 
Its dwellings between half-tide and low-water mark, 
Form, organs, &e., 
Different species identified by ae enehie, 
Branchiz so complex and luxuriant as to be indescribable, 
All of an arborescent form, 4 
Swims by violent contortions, 
The process of building described, 
Flexibility and use of the tentacula, 
Never resumes a tube if once forsaken, 
Length of tube indefinite, 
Tubes directed horizontally, 
Fashion of the architect, 
The animal can reverse itself in the iy : 
In the natural state a tuft terminates both ends of the tube, 
Use of these tufts uncertain, k 
The extent of the animal’s instinctive ation may be aacortattel 
by experiment, : : 3 : 
Food not ascertained, 
Subject to mutilation, 
The Terebella, in dying, quits its ibe 
Plate X XVI. explained, 
. TEREBELLA FIGULUS,—The Potter, 
In figure and habits resembles the preceding, 
Instinctively know they should be guarded from danger, 
Length, thickness, organs, &e., 2 “ 
Perhaps enjoys the reproductive faculties, 
Attempts at minute distinctions have led to fallacies, 
The number of tentacula dependent on age, or they may denote 
distinctions not yet recognised, 
In fabricating its dwelling prefers mud, 
Deprived of its tube, the body is closely eolstie up, 
Never satisfied with the size of the tube, 
Process of building, 
Size and form of the tube, : 
Operations conducted so as to economise Se 
The sense of feeling seems the strongest, 
Vision most obscure, 
347 
183 
ib. 
ib. 
184 
ib. 
ib. 
185 
ib. 
186 
ib. 
187 
ib. 
188 
ib. 
189 
ib. 
ib. 
190 
ib. 
ib. 
191 
ib. 
ib. 
192 
ib. 
ib. 
193 
ib. 
194 
ib. 
ib. 
195 
ib. 
196 
ib, 
197 
ib. 
