K)LTZOA. 95 



* 35. F. aculeata, Busk, I.e., p. 33. Sides of the cells within 

 the margin beset with furcate spines ; ovicell cucullate, external ; 

 surface aculeate. (Busk.} 



New Zealand (Lyall). Tasmania. 



* 36. F. blainvillii, Lamouroux ; Gray, I.e., ii., p. 293. Sub- 

 quadrangular, formed of four series of ovate convex cells, with an 

 oblong margined mouth, and scattered with flexible root-like fibres. 

 (Gray.} 



New Zealand (Dr. Sinclair). 



FAMILY GEMELLAKIID^;. 



Polyzoarium continuous, dichotomously branched ; branches with 

 cells in opposite pairs. 



DIMETOPIA. 



Cells joined back to back ; aperture oblique ; each pair facing at 

 right angles to those above and below ; at a bifurcation, the pair being 

 disjoined, each of the disjoined cells gives off a secondary pair. 



Australia. 



37. D. spicata, Busk, I.e., p. 35. Cells infundibuliform ; margin 

 thickened, with numerous equidistant, elongated, acute spines. White 

 and transparent, forming thick tufts about 1^ to 3 inches or more in 

 height. 



Lyall's Bay. Bass's Straits, 45 fathoms. 



38. D. COrnuta, Bush, I.e., p. 35. Cells contracted below the 

 middle ; aperture oblique, wide above ; a strong conical process on each 

 side above ; one or two long projecting spines in front, inserted below 

 the margin. Branches narrower than the former ; yellowish ; tufts 

 loose. 



Lyall's Bay. Bass's Straits, 45 fathoms. 



FAMILY MEMBEAKIPOEIDJE. 



Polyzoarium membrano-calcareous, or calcareous, expanded, en- 

 crusting, sometimes foliaceous, contorted and sub-erect ; cells hori- 

 zontal, quincuncial or serial. 



MEMBRANIPORA. 



Cells more or less irregularly disposed, or quincuncial, with raised 

 margins, a greater or less extent of the front membranaceous and 

 flexible. 



Europe. Greenland. Australia. South America. South Africa. 



39. M. membranacea, Linnceus, BusJc, I.e., p. 56. Cells 

 oblong, with a short blunt spine at each upper angle. 



Lyall's Bay ; on Fuels, &c. Europe. Australia. 



40. M. pilosa, Linnceus ; Gray, Diejf. N.Z., ii., JP. 292 ; Johnston, 

 Brit. Zoopli., p. 280. Cell prolonged below ; a moveable spine or 

 vibraculum below the lower margin of the aperture, sometimes aborted ; 

 an irregular number of marginal spines ; wall of cell cribriform. 



Lyall's Bay. Europe. Australia. 



