ANTHOZOA HYDROIDA. 79 



The branclilets plumose or pectinate. Plumu- 



LAEIA. 



The branchlets whorled. Antennularia. 

 Family IV. Polype-cells on ringed stalks. Campanu- 



LARIADiE. 



Cells alternate, campanulate. Laomedea. 

 Cells irregular or whorled. Campanulaeia. 

 •X")Hf Polypes propagating by buds and ova, which develope 

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

 Ehrenherg. 

 Family V. HYDRAiDiE. 

 One genus only — Hydra. 



" Involved in sea-^vrack, here you find a race 

 \Yliicli Science, doubting, kuows not where to place ; 

 On shell or stone is dropp'd the embryo 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 



