THE OCEAN WOULD. 
308 
From these remarks it will be seen that the animalculse of the 
Bryozoaires is more complex in its form and functions than that of the 
polypier, and the study of then anatomy confirms this conclusion- 
In their case the digestive organs are no longer a simple sac with a 
single orifice ; there is a mouth, a pharynx, a gullet, a gizzard, a mem- 
branous stomach and intestines, with a special opening. A\ e have 
descriptions of some species in which the gizzard seems to be provide 
with a certain number of interior teeth forming a wonderful pavement--' 
a living mill for the purpose of grinding the food before it enters int° 
the second stomach. The organization of this small creature reveal® 
to oar eyes a wonderful amount of combination — of admirable ait 
immeasurably surpassing all that the most perfect human industry am 
human genius can accomplish. 
After this general view of the organization of the group, we shal 
proceed to introduce the reader to some of their more characteristic 
species. 
Under the leaves of water-lilies (Nymphea), pond-weed (PotaW 0 ' 
geton ), or upon floating fragments of submerged wood, are generally t0 
be found certain Bryozoaires, animals described by Trembley under the 
name of plumed polypes. These are Plumatdlse (Fig. 121). These 
little diaphanous creature® 
constitute colonies which 
under the microscope re ' 
semble small branching 
shrubs ; they consist of small- 
slender tubes grafted one 1 
the other, and having h' 0111 
forty to sixty retractile 
tentacula, which expan 
like the petals of a flower ’ 
they are furnished 1 
vibratile cils, the m° ve 
the 
Fig. 121, PlumateHa cristnllina (afLer Eoesel). 
ments of which serve 
purpose of leading food i^ 0 
the mouth. 
Another genus which is found in ponds in France, and which is ^ s ° 
found in fresh water in Britain, is the Crist atella of Cuvier. “ Perm 
specimens of C. mucella occur from six lines to twenty- four in length h? 
