26 
THE VOYAGE OF H.M.S. CHALLENGER. 
The anterior avicularia are sometimes aborted throughout a considerable part of an 
internode, but never entirely so, and in most cases their site is indicated by a pore-like 
opening. These organs do not appear to be developed in connection with any individual 
zooecium, and they might be regarded perhaps rather as an intermediate series of meta- 
morphosed zooecia. 
(2) Canda simplex, n. sp. ? (PI. XIV. fig. 8). 
Character. — Zoarium spreading, rather closely reticulate. Frontal area rhomboidal ; 
aperture oval and about half the length of the area ; margin not recedent at the top ; 
with a very small spine at each upper angle ; margin and lamina thin, indistinctly and 
finely granulated. No anterior avicularia except on the summit of the ooecia. Ocecia 
subglobose with a small membranous area in front. 
Habitat. — Station 44, lat. 37° 25' N., long. 71° 40' W., 1700 fathoms, blue mud. 
[Gulf of Mexico, 2 to 15 fathoms.] 
In the Challenger collection this form is represented by only one or two minute 
fragments, in pretty good condition, but which would have been insufficient for its deter- 
mination, had I not been in possession of specimens of obviously the same form from 
the Gulf of Mexico, which have enabled me to draw up the above diagnosis. The only 
difference between the form procured at a depth of 1700 fathoms, and that which had 
lived at about 12 fathoms, is in the much greater delicacy and slenderness of the former. 
It is a remarkable circumstance that a second species of Canda also occurs in the Gulf 
of Mexico, which has been described and figured by Prof. Smitt 1 under the not very well 
chosen name of Caber ea retiformis. This was procured by Count Pourtales, at a depth of 
68 to 270 fathoms. It differs from both the species above described in having a large 
reniform fornix, and from Canda arachnoides in having no avicularia whatever. 
Of this form I have a good many specimens, procured on John Adam’s Bank, North 
Atlantic, on the voyage of H.M.S. “Herald,” which agree in all particulars with Prof. 
Smitt’s description. 
6. Nellia, Busk. 
Salicornaria (pars), Bk., Voy. of Rattles., vol. i. p. 367. 
Nellia, Bk., Brit. Mus. Cat., vol. i. p. 18; Smitt; Macgilliv. 
Character. — Zoarium articulated, internodes short quadrangular. Zooecia quadri- 
serial, front flat or convex at bottom. The greater part of the front occupied by a large 
aperture ; border prominent, especially above, smooth and thick. Orifice quite at the 
summit. Ocecia absent. 
1 Florid. Bryoz., pt. i. p. 16, pi. v. figs. 43-46. 
