Descriptions of New or Little-known Polyzoa. 79' 



Allied to M. pyrula, Hincks, from which it differs in the 

 much smaller size and connection of the zooecia hy tubes, in 

 the same manner as occurs in Chorizojwra. The spines 

 also are more slender ; the first pair are usually nearly erect. 

 The avicularia, moreover, are different, being round or oval 

 bodies, situated above, and distinct from the zooecia in the 

 network of tubes by which these are connected. 



BiFLUSTRA COEONATA, Hincks' sp., PI. IX, Fig. 3. 



Zooecia large, quadrate ; margins thick, strongly granular, 

 sloping to the aperture, Avhich occupies greater part of 

 the area ; the upper edge smooth and slightly raised. An 

 avicularium above each zocecium, directed obliquel}' or 

 transversely. 



Western Australia, Mr. Wooster. 



I have only seen a single specimen, growing along with 

 B. savartii. It does not seem to differ from that described 

 by Hincks in Ann. and Mag. Nat. Hist., February 1881, 

 from Singapore or the Phillipines. It may be identical with 

 Membranipora cyclops. Busk, which I only know from the 

 description and figure in the British Museum Catalogue. 



BiFLUSTRA ACICULATA, n. sp., PL IX, Fig. 5. 



Zooecia large, elongated, distinct, slightly straighter above, 

 rounded below ; margin thick, bevelled inwards, covered 

 with fine-pointed granulations, and with a row of close very 

 fine sharp denticles projecting inwards from the edge of the 

 aperture. 



Port Jackson, New South Wales, Rev. Mr. Porter. 



BiFLUSTRA SAVARTII, Audouin, Var., PI. IX, Fig. (J. 



Mr. Wooster has sent me some specimens from Western 

 Australia, which I think must be referred to this species. 

 The zooecia are angular, rather broad, distinctly separated ; 

 aperture oval or elliptical, occupying about two-thirds of the 

 length of the cell, deep ; a thick granular lamina slopes 

 downwards to the aperture, the edge of which also is 

 denticulate. In some of the specimens there are numerous 

 small avicularia between the zooecia. 



Waters refers B. delicatula of Busk, and the zoology of 

 Victoria, to this species, but although closely allied, as 

 previously pointed out b}^ Smitt in the Floridan Bryozoa, 



