GEMELLARIA. 17 



ducccl below, and annul.itcd towards the base. Tlie 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 off 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 gemeUus, double. 



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



Busk, B.M. Cat. : Smitt. 

 SCRUPARIA /3, Oken, Lehrb. 1815. 

 GEXICELLARIA, Blainville, 1820. 

 LORICARIA, Lamx. Expos. M6th. 7. 

 ORISIA (sp.), Lamx. : Lamk. 

 NOTAHIA, Flem. Br. An. 1828. 

 LORICULA, Cuvier, 1830. 



GENERIC CHARACTER. ZOARIUM erect, phytoid. ZOCECIA 

 joined back 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. 



