Akt. XY. — DescviiMons of Neiu, or- Little-Knoiuii, Polyzoa. 



Pakt XII. 

 By p. H. MacGillivkay, M.A, M.R.C.S., F.L.S. 



[Bead 11th November, 1886.] 



Family Membeaniporid^. 



Amphiblestrum argenteum, n. sp. 



This species was described and figured in the Prodromus, 

 of the Zoology of Victoria, Plate 87, as Lepralia trifolium. 

 and subsequently referred to Me'inbranipora in Trans. 

 Royal Society, Victoria, 1881. It is not^ however^ the 

 Memhranijpora trifolium of S, Woods, and, consequently, 

 another name is required for it. The figures already given 

 are quite correct, except that the oral flap in the membran- 

 ous aperture is not shown. I give an amended description. 

 Zoarium encrusting. Zooecia variously shaped, elongated, 

 oval or rhomboidal, separated by narrow raised margins ; 

 lamina calcareous, finely granular, occupying about two- 

 thirds of the area; aperture trifoliate, the lower margin 

 straight or slightly convex, the entering angles rather 

 sharp ; two or three spines above, and frequently one close 

 to each angle of the aperture. Ooecia of moderate size, 

 globular, finely granular, sometimes with a narrow, smooth 

 rim. Avicularia rare, between the zooecia, with long, narrow 

 mandibles. 



Family Escharid^. 

 Schizoporella rostrata, n. sp. Plate I., fig. 2. 



Zoarium encrusting. Zooecia rhomboidal, separated by 

 narrow, sharply-raised margius, very slightly convex or 

 nearly flat, silvery, with numerous faintly-bordered pores ; 

 mouth with a wide shallow sinus in the lower lip, and a minute 

 denticle on each side internally ; an elevated process imme- 

 diately below the lower lip, on the inner aspect of which is 

 an avicularium, with the triangular mandible pointed up- 

 wards. Ooecialarge, globular; surface punctate or obscurely 

 perforated. 



Port Phillip Heads, Mr. J. B. Wilson. 



n2 



