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136 THE MOSS-ANIMALS. 
plant-animals, but, like all others of this kind, their 
young, born from the egg, are free. 
Although thus resembling corals, they are widely sep- 
arated from them by their structure. Each little ani- 
mal, when reduced to its typical form, is a simple sac 
containing the stomach, and is allied to the clam, the 
oyster, and the snail, all of which have the same plan of 
structure. The coral, as may be seen by looking closely 
into any one cell, has a number of thin plates all pointing 
from the rim toward the vacant centre, like the spokes of a 
hubless wheel, and is, therefore, related to the star-fish, 
jelly-fish, and others, which have the parts arranged in a 
star-like or radiatimg manner. Thus, while by a process 
of budding, animals may be grouped into shrub-like colo- 
nies, with an external resemblance to each other and to 
the plants, with which the older naturalists classed them, 
their internal structure may show that they belong not 
only to animals, but to very distinct branches of the ani- 
mal kingdom.—Coneluded in next number. 
EXPLANATION OF PLATE 4. Pectinatella magnifica Leidy. 
Fig. 1. Enlarged view of one lyzoGn, situated on the end of # 
hollow lobe. A”, cavity of this lobe; D, mass of gelatine below; E, 
wall of this lobe and tube; J, brown stripes in the stomach, the hepa- 
tic folds; M’, M", muscles for withdrawing the tube, retractors; N, 
N’, muscles of the fold, which in this species is very narrow. 
Figs. 2, 3, 4, the upper and lower side, and profile view of the sta- 
toblast ; W’, horny sheath; W”, annulus; W”, spines with hooks. 
