ANTHOZOA HYDROIDA. 79 



The branchlets plumose or pectinate. PLUMU- 



LARIA. 



The branchlets whorled. ANTENNULARIA. 

 Family IY. Polype-cells on ringed stalks. CAMPANU- 



LABIADJfi. 



Cells alternate, campannlate. LAOMEDEA. 

 Cells irregular or whorled. CAMPANULAEIA. 

 *** Polypes propagating by buds and ova, which develope 

 themselves on and in the body of the parent. HYDRINA, 



Family V. 



One genus only HYDEA. 



" Involved ia sea-wrack, here you find a race 

 Which Science, doubting, knows not where to place ; 

 On shell or stone is dropp'd the emhryo seed, 

 And quickly vegetates a vital breed." 



Crabbe seems to have observed these little marine animals 

 with the eye, not only of a poet, but also of a naturalist. 

 Before entering on the description of the individuals, it may 

 not be improper to give some preliminary remarks on hydroid 

 zoophytes in general. They differ much in size according 



