52 
THE VOYAGE OF H.M.S. CHALLENGER. 
In two out of the six series, the zooecia are narrower than in the others, and 
apparently always uninhabited, and without any oral orifice. 
Group B. FLUSTRINA. 
Family IX. Flustrid^e. 
Flustradce, Bk., Brit. Mus. Cat., voL i. p. 46; Gray (pars), Br. Rad., p. 145. 
Flustridae (pars) d’Orb., Rech. s. les Bryoz., Ann. d. Sci. Nat., 1851, p. 314; Hincks, Brit. Mar. 
Polyz. vol. i. p. 113; Smitt, Krit. Forteek. Skandinav. Hafs-Bryzoer, 1867, p. 357. 
Fscharidce (pars), Johnst., Brit. Zooph., 1st ed. p. 248 ; 2nd ed. p. 263 ; d’Orb. 
Polypiers a, reseau (pars), Lamk. 
Flustrees, Lamx., Exp. Meth. 
Character. — Zoarium membranaceous, expanded and foliaceous, or ligulate ; erect 
(sometimes decurrent on the support), uni- or bi-laminar. Zooecia quincuncially arranged, 
more or less open and membranaceous in front, without a raised border ; avicularia, when 
present, usually vicarious. 
The Family here contains the following genera : — 
§ A. Zooecia contiguous. 
§§ a. Utrinque porosce, Linne. 
1. Flustra, Linne. 
(1) Flustra crassa, n. sp. (PI. XVI. fig. 6.) 
(2) Flustra denticulata Busk (PI. XXXII. fig. 2). 
(3) Flustra biseriata, n. sp. (PI. XVI. fig. 1). 
(4) Flustra membraniporides, n. sp. (PI. XXXII. fig. 7). 
§§ /3. Pagina altera tantum porosce, Linne. 
2. Carbasea, Gray. 
(1) Carbasea ovoidea, Busk (PI. XVI. fig. 3). 
(2) Carbasea dissimilis, Busk. 
(3) Carbasea elegans, Busk (PI. XVI. fig. 5). 
(4) Carbasea peduncidata, n. sp. (PI. XVI. fig. 4). 
(5) Carbasea moseleyi, n. sp. (PI. XXXIII. fig. 4). 
(6) Carbasea pisciformis, Busk. 
(7) Carbasea cribriformis, Busk. (PI. XXXIV. fig. 8). 
§ B. Zooecia disjunct. 
3. Diachoris , Busk. 
(1) Diachoris magellanica, Busk. 
var. a distans (PI. XVI. fig. 2). 
