REVISION OF FRESHWATER SPONGES OF SPONGILLIDAE 123 



gemmoscleres embedded in this coat radially, their basal rotules 

 almost touching each other, and then- distal rotules projecting beyond 

 outer surface of pneumatic layer; foramen produced into a short, 

 somewhat conical porus tube. 



Distribution. — Formerly known only from Malaysia, Indonesia, 

 Thailand, and China; also occurring in Australia (Racek, AIS.). 



Color in life. — Light brown (Gee) to dark green. 



Discussion. — After a detailed comparative study of E. bogorensis 

 and E. hlemhingia, Gee (1930a) found the existing differences between 

 these two formerly separated species so small that he encountered 

 difficulties in expressing them; he had no hesitation in relegating the 

 latter to a varietal form of the former. The reexamination of the 

 type material of both species during the present study revealed 

 clearly that their separation, even on a subspecific level, is fully 

 unwarranted. It is obvious that Evans (1901) was unaware of the 

 description of E. bogorensis by Weber (1890), or he would have com- 

 pared his newly erected species with Weber's sponge as well as with 

 Dosilia plumosa. 



U. bogorensis is closely related to a number of species belonging to 

 other genera, and in particular to Heteromeyenia species (megascleres, 

 gemmoscleres, structure of gemmules, coloration, and minute form of 

 sponge) and Dosilia (megascleres and gemmoscleres). However, it 

 differs from species of both these genera in the complete absence of 

 free microscleres, and from Anheteromeyenia species in a number of 

 decisive criteria. 



Genus Corvomeyenia Weltuer, 1913 



Meyenia MiUs, 1S84, p. 146 (part) .—Potts, 1884b, p. 216 (part); 1887, p. 230 

 (part).— Mac Kay, 1889, p. 92.— Kellicott, 1891, p. 103 (part) .— Kirsch 

 1909, p. 37 (part).- Jewell, 1952, p. 453 (part) .— Weltner, 1895, p. 122 

 (part); 1913, p. 480. 



Ephydatia Smith, 1921, p. 17 (part).— Gee, 1931e, p. 37 (part); 1932c, p. 27 

 (part) .—Jewell, 1939, p. 16 (part). 



Corvomeyenia Weltner, 1913, p. 480. — Gee, 1931e, p. 36; 1932c, p. 27.— De 

 Laubenfels, 1936, p. 36.— Jewell, 1952, p. 453.— Penney, 1960, p. 35. 



Parameyenia Jewell, 1952, p. 455. 



Type species. — Meyenia everetti MiUs, 1884. 



Definition. — Megascleres slender and fusiform amphioxea, en- 

 tirely smooth. 



Microscleres always present in dermal membrane and symplasm; 

 they are microbirotulates with straight to strongly curved slender 

 shafts, and terminally with a small number of recurved hooks of 

 moderate length. 



Gemmoscleres birotulates of two length groups, both with slender 

 and smooth shafts and terminally with a smaller number of recurved 



