28 
THE VOYAGE OF H.M.S. CHALLENGER. 
The genus Caberea, together with the aberrant form Amastigia, constitutes a very- 
peculiar group. Formerly regarded by myself, and, I believe, still considered by all 
writers (including one of the latest and most careful 1 ) as unarticulated, I have now satisfied 
myself that such is not exactly the case. Though less distinctly divided into segments or 
internodes, the zoarium in Caberea is undoubtedly irregularly segmented, and especially 
is it the case that at each bifurcation one of the branches of the fork, which may perhaps 
be regarded as a lateral branch, is always discontinuous, though from the close manner in 
which the zooecia are approximated, the joint is often very inconspicuous, and allows of 
but limited flexion. The segmentation, whatever that character may be worth, which is 
perhaps not much, except as convenient in an artificial classification, is in any case 
sufficiently distinct to warrant the collocation of Caberea with its natural allies among 
the Cellulariadse, and especially of course with Scrupocellaria. 
Of this genus I am acquainted with seven or eight species, of which, however, not 
more than three or four can be certainly identified from any published descriptions. 
The Challenger collection affords six, of which four appear hitherto to have been 
undescribed. Of the six species, three occur in the Australian region (including New 
Zealand), one in what may be termed the Kerguelen region, and two in the south- 
western Atlantic region. 
§ a. fornicatce. 
1. Caberea rostrata, n. sp. (PI. XXXII. fig. 4). 
1 Selbia zelanica, Gray, Dieffenb. N. Z., vol. ii. p. 292. 
Character . — Zoarium radiate or flabelliform, about 1 inch in diameter ; branches 
long, straight, and close. Zooecia broadly oval. Area large, with a thin even margin. 
Aperture large. Fornix short, small, spatulate, with a thick peduncle; blade rather 
produced upwards ; peduncular spine very thick, long ; a short, thick, conical, ascending 
spine on the outer angle. Ocecium sub-cucullate ; wall entire, smooth. Besides the 
usual series of small anterior avicularia, occasionally one of enormous size and rostriform 
projects from the median line directly forwards, having a strong curved acute mandible. 
Habitat . — Station 167, lat. 39° 32' S., long. 171° 48' E., 150 fathoms, blue mud. 
2. Caberea crassimarginata, n. sp. (PI. XI. fig. 1). 
Character . — Zoarium rather straggling, regularly dichotomous. Zooecia biserial. Area 
elongated elliptical, with a very thick and rounded granular border, leaving an 
elongated narrow aperture. One or two oral spines on the outer side, and one on the 
inner (peduncular). Fornix bilobed, the lower lobe much elongated and narrow, the 
1 Hincks, Brit. Mar. Polyz., vol. i. p. 57. 
