ON RECENT POLYZOA. 519 
_ ‘Branches biserial, dichotomous, connected by transverse chitinous 
ubes, inserted at both ends into a vibracularium. No lateral avicularia, 
and the anterior avicularia when present placed on a special median 
et, or on the summit of the owcia. A vibracularium lodged in a sinus 
hind ; flagellum short, flattened, not toothed. With or without a 
pedunculate fornix.’—Busk, ‘ Chal. Rep.’ p. 25. 
1. Canda arachnoides, Lamw., ‘Chal. Rep.’ p. 25 
£ = Cellaria filifera, Lamk., vol. ii. p. 177. 
- 2 4, simplex, Busk, ‘Chal. Rep.’ p. 26, pl. xiv. fig. 8. 
- 3. ,,  retiformis, Smit, ‘Florid. Bry.’ (See following remarks.) 
The Canda arachnoides, Lamz., is abundant and fine in the Australian 
; but as the C. simplex is an Atlantic species, Mr. Busk’s remarks 
on the form are very appropriate. ‘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 determination 
had I not been in possession of specimens of obviously the same form 
from the Gulf of Mexico. . . . It isa remarkable circumstance that a 
second species of Canda also occurs in the Gulf of Mexico, which has 
m described by Prof. Smitt (Florid. Bry., pt. I. p. 16, pl. v. figs. 
46), under the not very well chosen name of Caberea retiformis.’— 
k, * Chal. Rep.’ p. 26. 
_ Lamouroux’s figure of C. arachnoides is good, and his descrip- 
tion is well worth giving. ‘Frondescent, fan-shaped, and dichotomous 
polypidom. Branches united by small lateral and horizontal fibres. 
Cells alternate, united, placed on only one surface, and not projecting.’ 
Flex. Coral,’ p. 57, pl. ii. figs. 6, a bc d. 
Lovality: On the rocks of Tamor. 
Genus 14. Nellia, Busk 
_ = Salicornaria (pars.), Bk., ‘ Voyage of Rattlesnake,’ vol. i. p. 367 
_ =Nellia, Bk., ‘ Brit. Mus. Cat.’ vol. i. p. 18.  Smutt. 
_ ‘Zoarium articulated, internodes short, quadrangular. Zocecia quadri- 
“serial, front flat or convex at bottom. The greater part of the front 
pied by a large aperture; border prominent, especially above, smooth 
Oc 
and thick. Orifice quite at the summit. Ocecia absent.’—Chal. Rep. p. 26. 
1. Nellia oculata, Busk, ‘ Chal. Rep.’ p. 27 
= N. oculata, Bk., ‘ Brit. Mus. Cat.’ 
=N. oculata, Smitt, ‘ Florid. Bry.’ 
= N. oculata, Macgil., ‘ Nat. Hist. Vict.’ 
2. ,, simplex, Busk, ‘Chal. Rep.’ pl. v. fig. 6; and ‘ Brit. Mus. 
Cat.’ p. 19. 
Genus 15. Caberea, Lame. 
= Selbia, Gray; Flabellaria, Gray; Canda, D’Orb. 
‘Zoarium not articulated. Zocecia not articulated, sub-quadrangular 
or ovate, with a very large aperture. Sessile avicularia on the side and 
front of the cells, the lateral avicularium minute. Vibracular cells very 
large, placed in two rows, stretching obliquely downwards across the 
