108 ANALOGOUS TYPES. 
may not be easily traced. But the common 
names used by the fishermen often indicate these 
resemblances, — as, for instance, Sea-Vulture, 
Sea-Hagle, Cat-Fish, Flying-Fish, Sea-Porcupine, 
Sea-Cow, Sea-Horse, and the like. 
In the branch of Mollusks, also, the same 
superficial analogies are found. In the lowest 
class of this division of the Animal Kingdom 
there is a group so similar to the Polyps, that, 
until recently, they have been associated with 
them, —the Bryozoa. They are very small ani- 
mals, truly allied to the Clams by the plan of 
their structure, but resembling the Polyps on 
account of a radiating wreath of feelers around 
the upper part of their body: yet, when exam- 
ined closely, this wreath is found to be incom- 
plete; it does not form a circle, but leaves an 
open space between the two ends, where they 
approach each other, so that it has a horseshoe 
outline, and partakes of the bilateral symmetry 
characteristic of its type and on which its own 
structure is based. These series have not yet ~ 
been very'carefully traced, and young natural- 
ists should turn their attention to them, and be 
prepared to draw the nicest distinction between 
analogies and true affinities among animals. 
