610 



POLYZOA. 



have been taken from Bass's Straits at a depth of forty-five fathoms. As 

 a general rule, however, the Polyzoa prefer the shallower waters, and 

 are most commonly found a little below low-water mark. 



Fig. C is another species belonging to the same genus, and is remark- 

 able for the long pointed spines that project from the margin, like a 

 pair of cow's horns. In allusion to this peculiarity it is called Cateni- 

 cella cornuta. 



At Fig. D is shown another curious polyzoon, termed Calpidium or- 

 natum, also found in Bass's Straits, at the same depth as the preceding 

 species. A magnified figure is given in order to show the singular 

 method -of its construction. 



An example of the typical genus of this family is given at Fig. E, 

 where the Salicoriiaria farciminoldes is represented of the natural size. 



We now arrive 

 at another family, 

 the Cellularidse, 

 where the general 

 shape resembles 

 that of the pre- 

 ceding family, but 

 / ^'iM.'^i^^mm^'Hm^i^^mm^^ /^p^ the cells, instead 



I" '^iWr'" ^^SfSr.K'-\'^f^^m^^& J^^^ ^ bemg arranged 



X <---^/ ^^^^ ' ^^^^^m .^f round an imag- 



inary axis, and so 

 forming cylindri- 

 cal branches, are 

 on the same plane. 

 Fig. F is a mag- 

 nified example of 

 this family, the 

 Cellularia Peachii, 

 so called in honor 

 of the eminent nat- 

 uralist, Mr. Peach. 

 At Fig. G is 

 shown the mouth 

 of a single cell be- 

 longing to the ge- 

 nus Menipea, found in Terra del Fuego, and termed, from its habitat, 

 Menipea Fuguensis. The object of giving this example is to show the 

 curious " operculum " which closes, or rather guards, the mouth of 

 the cell, and in this genus is in the form of a simple spike. This 

 species is found at low-water. 



Every one who has walked along the seashore must have observed 



Sea Mat [Flustra foliacea). 



