POLYZOA. 91 



SALICORNARIA. 



Front of cell depressed, surrounded by an elevated ridge, by which 

 the surface is divided into more or less regular rhornboidal or hexagonal 

 spaces ; no aperture ; avicularia disposed irregularly. 



Europe. South Africa. Australia. South America. 



15. S. farciminoid.es, Johnston, Hist. Brit. Zoopk., p. 355. 

 Front of cell rhouiboidal, or hexagonal with a straight side at top and 

 bottom, sometimes arched above ; cells in the same series contiguous ; 

 surface granular ; avicularium distinct from and above a cell, rostrum 

 immersed, mandible semicircular. 



Europe. South Africa. Australia. 



16. S. malvinensis, Busk, I.e., p. 18. Front of cell arched 

 above, very acute below ; cells distant in the same series ; surface 

 smooth ; avicularium replacing a cell, rostrum immersed, mandible 

 wide, large, triangular, pointed. 



South America. Falkland Islands. 



17. S.(?) nirsilta, sp. nov. Front of cell rhomboidal, margin 

 raised, surface granular ; cells in the same series distant ; a long 

 vibraculum at the base of each cell. 



Lyall's Bay. 



FAMILY SCEUPAEIAD^;. 

 Polyzoarium continuous throughout ; cells uni-serial. 



BEANIA. 



Polyzoarium confervoid, sub-corneous, or calcareous ; cells arising 

 one from another by a slender filiform tube ; cell open in front, the 

 edges of the opening furnished with hollow spinous processes arching 

 over the opening ; mouth terminal, with a denticle on each side. 



Britain. Patagonia. 



18. B. SWainsoni, sp. nov. Polyzoarium erect, phytoid, dicho- 

 tomously branched, sub-corneous ; cells sub-continuous, one arising 

 from the top of another ; costse eight to twelve. 



From the collection of the late "W. Swainson, Esq. 



FAMILY CABEREID^:. 



Polyzoarium continuous throughout, erect, or flexible, dichoto- 

 inously divided into ligulate bi-multiserial branches, on the backs of 

 which are vibracula, or avicularia, one common to several cells ; avicu- 

 laria sessile. 



CABEREA. 



Back of the branches covered with large vibracula, which are 

 placed obliquely in two rows, diverging in an upward direction from 

 the middle line, where the vibracula of either side decussate with those 

 of the other ; avicularia, when present, sessile on the front of the 

 cell. 



19. C. boryi, Andouin, Busk, I.e., p. 38. Cells bi-serial ; aperture 

 oval; pedunculate operculum expanded principally downwards, and 



