ANTHOZOA HYDROIDA. 85 



In branching lines tlie parent trunk adorns, 



And parts ere long like plumage, hairs, or horns." 



There are several kinds of eggs from which young animals 

 spring. There are what have been called motive buds pro- 

 duced in the ovisacs. These are found in the Tvhulanna like 

 little clusters of grapes, growing from the bases of the ten- 

 tacula. Sir J. G. Balyell,, in the 'Edinburgh New Philo- 

 sophical Journal/ in his observations on Tuhularia indivim, 

 states, that as soon as the bulb had fallen from its crested 

 head, slight prominences, enlarged at the tips, pullulate 

 from the under surface, and the " nascent animal,^'' elevating 

 itself on these rudiments of the tentacula, as on so many 

 feet, enjoys the faculty of locomotion. "Apparently se- 

 lecting a site, it reverses itself to the natural position, with 

 the tentacula upwards, and is then rooted permanently by a 

 prominence, wliich is the incipient stalk, originating from 

 the under part of the head. Gradual elevation of the stalk 

 afterwards continues to raise the head, and the formation of 

 the zoophyte is perfected.''^ In writing respecting Lamne- 

 dea dicJiotoma, he says that the vesicles, which are seldom 

 produced, contain from twenty to thirty greyish corpuscula, 

 with a dark central nucleus. At first, all are immature and 

 quiescent, but motion at length commences : the corpuscula 



