POLYZOA. 89 



5. C. margaritacea, Busk, I.e., p. 9. Cells oval or sub- 

 globular, much compressed ; avicularia short and broad, supporting a 

 deep cup-like cavity ; fenestrse five, large, with fissures radiating 

 upwards ; lower margin of aperture notched in the middle ; back of 

 the cell minutely sulcate ; sulci short, interrupted, irregular. 



Lyall's Bay. Swan Island ; Australia. 



(.) Vitiatce. 



Cells furnished -with a narrow elongated band or " vitta " on each side ; 

 without fenestree ; ovicells galeriform, not terminal. 



* 6. C. perforata, Busk, I.e., p. 10. Cells elongated oval ; 

 avicularium processes large, perforated at the base, or by several 

 openings ; vittae long, wider below, lateral ; surface in front papillose. 



New Zealand (Hooker, Lyall, Darwin). Tasmania. Australia. 



* 7. C. ringens, Busk, I.e., p. 10. Cells ovoid or sub-globular; 

 avicularia usually very unequal, the larger one gaping ; vittse anterior, 

 broad ; surface in front smooth. 



New Zealand (Dieffenbach) . South Africa. 



* 8. C. elegans, Busk, I.e., p. 10. Cells elongated ovoid ; avicu- 

 laria large and projecting, without any superior appendage ; vittae 

 narrow, sub-lateral, surface in front papillose. 



Port Cooper. Banks' Peninsula. Bass' Straits, 47 fathoms. South 

 Africa. Port Dalrymple. 



(<?.) Simplices. 



Without vittse or fenestrse. 



0. C. alata, sp. nov. Cells ovate, narrowed below ; lateral pro- 

 cesses projecting horizontally and forwards from the whole length of 

 the cell ; mouth round, simple, with a thickened rim, placed in the 

 upper part of the cell ; surface smooth, with a single median pore 

 (fenestra?), and occasionally another on each side of it. 



Lyall's Bay. 



FAMILY CELLULAEIIDJB. 



Polyzoarium divided into distinct internodes by flexible joints ; 

 internodes formed by two or more cells in a row ; cells disposed in the 

 same plane, forming linear branches of a dichotomously divided, 

 phytoid, erect, polyzoarium. 



CELLULAEIA. 



Cells bi-triserial, more than four in each internode ; oblong or 

 rhomboidal, contiguous ; perforated behind ; without avicularia or 

 vibracula. 



Europe. Australia. South Africa. 



10. C. CTlSpidata, Busk, I.e., p. 19. Upper and outer angle 

 produced into a strong spine ; a single perforation behind ; a cuspidate 

 spine on the summit of the median cell at each bifurcation; ovicell 

 smooth. 



Lyall's Bay. Australia. 

 12 



