30 
THE VOYAGE OE H.M.S. CH ALLEN GEE. 
Sub- Order III. CTENOSTOMATA, Busk. 
Cteno.stomata, Busk, Hincks, Smitt, Auctt. 
Halcyonellea and Vesicularina, Johnst. 
Character. — Zooecial orifice simply circular, bilabiate (?) or quadrangular ; retractile ; 
border contractile, furnished with a setose or membranous fringe or velum. Zoarium 
corneous or membranaceous, or carnose ; never calcified. No marsupial or appendicular 
organs. 
Division I.— HALCYONELLEA. 
Halcyonellea, Ehrenberg, Hincks. 
Polyzoa carnosa, Gray. 
Alcyonidulse, Johnst. 
Haley onellese, Smitt. 
Character. — Zoarium membranous or carnose, or semigelatinous, developed by 
continuous gemmation of the zooecia from each other. 
This division, embracing in Mr. Hincks’ classification the genera 
Alcyonidium, 
Flustrella, 
Arachnidium, 
is represented in the Challenger collection by a single species referable to Alcyonidium. 
Family I. Alcyonidulse. 
Alcyonidulse, Couch. 
Halcyonellex, Smitt. 
Alcyonidiidse, Hincks. 
Character. — Zooecia more or less closely united, immersed in an expanded and 
adherent gelatinous crust, or forming an erect, cylindrical or compressed zoarium ; orifice 
closed by the invagination of the tentacular sheath. 
The Family here contains : — 
1. Alcyonidium, Lamouroux. 
(1) Alcyonidium jlustroides, n. sp. (PI. X. figs. 13, 14). 
