CABEREA ELLISII. 59 



remarkable movements depend ; but they certainly seem 

 to imply the existence of a nervous system distinct from 

 that of the individual polypides, by which the vibracular 

 zooids are controlled and brought into relation. 



The CaberecB constitute a small group^ of which one 

 (C Boryi) is almost cosmopolitan; another (C ElUsii) 

 is an Arctic species^ which ranges to the more northerly 

 portions of our coasts_, on the one hand, and to Labrador 

 and Maine, on the other ; and the remainder inhabit the 

 Australasian seas. 



Caberea Ellisii, Fleming, 



riate VIII. figs. 6-8. 



Flustea Ellisii, Flem. Mem. Wern. Soc. ii. 25J, pi. xvii. figs. 1--3. 



Flustra setacea, Flem. B. A. 536 : Johnston, B. Z. ed. 2, 346. 



Cellularia Hookeri, Johnston, B. Z. (ed. 2), 338, pi. Ix. figs. 1, 2. 



BicELLARiA Hookeri, Blainville, Diet. Sc. N. Ix. 424. 



Caberea Hookeri, Busk, B.M. Cat. i. 39, pi. xxxvii. fig. 2 : Gosse, Mar. 

 Zool. ii. 14, fig. 20. 



Flabellaria setacea, Gray, B.M. Cat. Ead. 106. 



Caberea Ellisii, Hincks, Devon & Cornw. Cat. 63: Smitt, QJfyers. K. Vet. 

 Akad. Forhandl. 1867, 287 & 327, pi. xvii. figs. 55, 56 : 

 Norman, Quart. Journ. ]\Iicr. Sc, (n. s.) viii. 217. 



Zoarium fan-shaped, of a yellowish-brown colour, dicho- 

 tomously branched, branches thick, widening up- 

 Avards. Zocecia in 2-4 rows, short, subquadrangular ; 

 aperture elliptical, occupying nearly the whole of the 

 front, with a broad, minutely granulated margin, sloping 

 outwards; marginal cells with two stout spines above 

 on the outer side and one on the inner; central cells 

 with one on each side. Lateral avicularia small and 

 inconspicuous, placed a little below the top of the cell, 

 with a rounded mandible ; anterior avicularia raised, 

 two below the aperture, placed one at each side, or 

 sometimes only one ; mandible rounded, directed 

 downwards. Vibracula very long, serrate, Ooccia 

 flattened, frequently with a depressed, smooth, semi- 



