ANTHOZOA HYDROIDA. 79 
The branchlets plumose or pectinate. Piumv- 
LARIA. 
The branchlets whorled. ANTENNULARIA. 
Family IV. Polype-cells on ringed stalks. Campanu- 
LARIADA. 
Cells alternate, campanulate. Laomepna. 
Cells irregular or whorled. CampaNnuULaRIA. 
**% Polypes propagating by buds and ova, which develope 
themselves on and in the body of the parent. Hyprina, 
Lhrenberg. 
Family V. Hypraipa. 
One genus only—Hypra. 
*‘ Involved in sea-wrack, here you find a race 
Which Science, doubting, knows 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 
