110 ATRACTYLID^;. 



very frail, and soon disappears after the death of the 

 polypite. 



The gonozooids, which are produced in great numbers, 

 undergo remarkable changes after their liberation. These 

 consist in the development of additional tentacles and 

 ocelli on the marginal bulbs, until the number reaches 6 

 or 8 in each cluster, and in the dichotomous division and 

 subdivision of the oral appendages. When fully matured, 

 they are probably identical with the B. Britannica of 

 Forbes's monograph. 



The changes in the zooid subsequent to its detachment 

 have been observed by Wright in this species, and by A. 

 Agassiz in the American B. superciliaris. We learn from 

 the latter author that the second sets of tentacles are " de- 

 veloped in pairs, one tentacle on each side of those of 

 the first set," and the development proceeds in this order 

 until the number is complete. 



In its first stage the gonozooid of B, ramosa is the Me- 

 dusa ocilia of Dalyell. 



Hab. On shells and stones and on other zoophytes : 

 Scotland, on Virgularia mirabitis (Dalyell) : Queensferry, 

 Firth of Forth (T. S. Wright) : Oban Bay, in about 15 

 fathoms, very fine; dredged in Torbay (T. H.) : from the 

 deep-water fishing-boats, Northumberland, fine (J. A.) . 



[Ostend, Van Ben.] 



2. B. FRUTICOSA, Allman. 



BOUGAINVILLIA FRUTICOSA, Allman, Notes on the Hydroida, Ann. N. H. for 



July 1864. 

 EUDENDRIUM RAMOS, Allman, Proc. Hoy. Soc. Ed. Dee. 6th, 1858. 



ZOOPHYTE rising to the height of about 2 inches, much 

 branched; MAIN STEMS composed of aggregated tubes; 

 branches subalternate, the polypary of the smaller 

 branches slightly corrugated transversely; POLYPITES 



