30 
THE VOYAGE OF H.M.S. CHALLENGER. 
(4) Caberea rudis, Busk. 
Caberea rudis, Bk., Brit. Mas. Cat., vol. i. p. 38, pi. xlvi. ; pi. xxxvi. figs. 1, 2 ; Voy. of 
Rattles., vol. i. p. 377. 
Character . — Zoarium broad, frondose, 2 or 3 inches high ; branches disposed 
in the same plane, flat, thick, and about -|th inch wide. Zocecia (viewed behind) 
rhomboidal. Aperture oval, margin much thickened ; a strong oral spine on each side 
in the central cells ; three strong and long spines on the outer side, and one on the 
inner in the marginal cells. Fornix spatulate, wide, with a very broad peduncle. 
Two small avicularia in front below the aperture in the central cells, and a single large 
avicularium below the aperture in the marginal ones. Vibracula slender, with very 
delicate walls ; seta of moderate size, serrated. 
Habitat. — Station 161, off entrance to Port Philip, 33 fathoms, sand. 
[Bass Strait, Voy. of Rattles.] 
In the Brit. Mus. Cat. the seta is erroneously described as not serrated. 
(5) Caberea minima, n. sp. (PI. XXXII. fig. 5). 
Character . — Zoarium very small, about \ i nc h wide, fan-shaped ; branches short, 
irregularly dichotomous. Zooecia, area nearly circular. Aperture almost as large 
as the area, entirely open above ; lamina smooth and very delicate. Fornix with a 
subcordate or circular blade, apparently articulated to a very wide and thick peduncle, 
and standing some distance in front of the aperture. Peduncular spine very strong ; 
median avicularium arising immediately above the base of the peduncle. 
Habitat. — Station 315, lat. 51° 40' S., long. 57° 50' W., 5 to 12 fathoms, sand and 
gravel. 
[Falkland Islands.] 
§ /3. apertce. 
(6) Caberea lata, Busk (PL XI. fig. 3). 
Caberea lata, Bk., Voy. of Rattles., voL i. p. 378; Brit. Mus. Cat., p. 39, pi. xlvii. 
Character . — Zoarium flabellate, branches rather wide, broadly truncate. Zooecia, area 
occupying the entire front, margin thin and smooth. Aperture elliptical, large. A small 
avicularium (often aborted) at each lower angle of the aperture. Often a short spine at 
the upper and outer angle of the lateral cells, each of which is also furnished with a rather 
large extrangular avicularium. Vibracularia very long, closely approximated, and very 
