igii.] N. Annandale : Ctenostomatous Polyzoa. 201 



Norodonia sinensis, JuUien, from China; 

 Norodonia cambodgicnsis, Jullien, from China, Cambodia 

 and Siam. 



Echinella placoides,^ Korotneff, from Lake Baikal in Siberia 

 also appears to belong to the genus. 



I have not seen any of these forms, but apparently N. sinensis 

 is distinguished by having narrow zooecia with circular orifices, 

 while in N. cambodgiensis the zooecia are nearly circular but con- 

 stricted posteriorly. In both these forms the growth is less 

 luxuriant than in the typical form of the species. E. piacoides, 

 which may be a distinct species, is distinguished by the great 

 length of the spines at the four corners of the orificial rim. 



A fourth form, for which the name subspecies moniliformis is 

 proposed, occurs in Calcutta and is distinguished by the shape of 

 the zooecia and the method of growth. The former are practi- 

 cally circular but truncated, not constricted posteriorly and sur- 

 rounded by a flat membranous fringe. The lateral basal buds are 

 very often suppressed and both are rarely produced, so that a 

 linear zoarium with occasional side-branches is formed. 



The diagram on p. 200 represents the relationships of the 

 Paludicellina, as they appear to me. 



LITERATURE. 



1856, Allman, A M onograph of the Fresh Water Polyzoa (London). 



1880. Hincks, A History of the British Marine Polyzoa. 



1885. Jullien, "Monographic des Bryozoaires d'Eau Douce," 



Bull. Soc. zool. France, x, p. 91. 

 1887 and 1892. Kraepelin, " Die deutschen Siisswasserbr3^ozoen," 



Ahhandl. Nat. Vereins Hamburg, x and xii. 

 1907. Rousselet, "Zoological Results of the Third Tanganyika 



Expedition, conducted by Dr. W. A. Cunnington, 



1904-1905 — Report on the Polyzoa," Proc. Zool. Soc. 



London, i, p. 250. 



1910. Loppens, "Catalogue des Bryozoaires d'Eau Douce avec 



une Note sur Victorella pavida," Ann. Soc. zool. et mala- 

 col. Belgique, xliv, p. 97. 



1911. Annandale, "Freshwater Sponges, Polyps and Polyzoa," 



Faun. Brit. Ind. 



1 Biol. Cenfralb., xxi, p. 311, fig. (1901). 



