GEMELLARIA. 17 



duced below, and annulatcd towards tlie base. The form 



of the ovicells is peculiar and very picturesque ; they are 



broad, rising to a point above, and carinate in front. 



They seem to be sparingly developed. The creeping stem 



is very much attenuated ; it swells out at intervals, like 



that of Aetea, into somewhat oval expansions, from which 



the cells originate; but they are small and inconspicuous. 



Branches are given oif from the sides of these enlarged 



portions, as in the last-named genus. The polypide is 



very small and delicate, with 10 or 12 tentacles, and is 



remarkable amongst an active tribe for the vivacity of its 



movements *. It affords a good example of the simpler 



type of polyzoan structure, and, from the nature of its 



cell, is readily examined. 



Genus GEMELLARIA, Savigny. 



Der. From gemellus, double. 



Gemellaria, Savigny, 1811 : Van Beneden: Johnston, B. Z. : D'Orbigny : 



Busk, B.M. Cat. : Smitt. 

 ScRUPARiA |3, Oken, Lelirb. 1815. 

 Gemicellaria, Blainville, 1820. 

 LoRicARiA, Lamx. Expos. Meth. 7. 

 Crisia (sp.), Lamx. : Lamk. 

 NoTAMiA, Flem. Br. An. 1828. 

 LoRicuLA, Cuvier, 1830. 



Generic Character. — Zoarium erect, phytoid. Zocecia 

 joined hack to back ; the cells composing the pairs rising one 

 from the top of the other, all the pairs facing the same way. 

 Aperture large, on the front of the cell, slightly oblique. 



* I give it this character after many years' acquaintance. It is a most 

 nimble creature ; and there is always a fresh interest in watching its pretty 

 ways. 



