104 U.S. NATIONAL MUSEUM BULLETIN 272 



Genus Heterorneyenia Potts, 1881, restricted 



Heteromeyenia Potts, 1881, p. 150 (part); 1887, p. 236 (part). — MacKay, 1889, 

 p. 93 (part).— Hanitsch, 1895, p. 128.— Weltner, 1895, p. 114 (part).— Girod, 

 1899, p. 106 (part).- Kirsch, 1909, p. 37 (part) .— Annandale, 1909d, p. 404 

 (part); 1918a, p. 213 (part) .— Arndt, 1926, p. 344.— Schroder, 1927b, p. 107 

 (part).— Gee and Wu, 1928, p. 11.— Gee, 1931e, p. 39.— De Laubenfels, 

 1936, p. 36 (part).— Eshleman, 1950, p. 41 (part) .— Wurtz, 1950, p. 5 (part).— 

 Jewell, 1952, p. 451 (part, not type species). — Simon, 1952, p. 80. — Penney, 

 1960, p. 40 (part). 



Dosilia Gray, 1867, p. 650 (part) .— Dybowsky, 1884, p. 507. 



Carterella Potts, 1881, p. 150. 



Carterius Petr, 1886, p. 92.— Mills, 1887, p. 167.— Vejdovsky, 1886, p. 175; in 

 Potts, 1887, p. 179.— Weltner, 1895, p. 114.— Girod, 1899, p. 113.— Lauter- 

 born, 1902, p. 519.— Kirsch, 1909, p. 37.— Arndt, 1926, p. 344.— Schroder, 

 1926, p. 240.— Gee, 1931e, p. 35; 1932c, p. 26.— De Laubenfels, 1932, p. Ill; 

 1936, p. 36.— Eshleman, 1950, p. 44.— Wurtz, 1950, p. 6.— Jewell, 1952, 

 p. 452.— Penney, 1960, p. 33. 



Heteromeyenia {Oxheteromeyenia) Schroder, 1927b, p. 107. 



Type species. — By subsequent selection (De Laubenfels, 1936) 

 Heteromeyenia repens Potts, 1881, now a synonym of Heteromeyenia 

 haileyi (Bowerbank, 1863). 



Definition. — Megascleres usually slender and distinctly fusiform 

 amphioxea, covered with minute and irregidar spines except at their 

 tips. 



Microscleres long and thin, sharply pointed and fusiform amphioxea, 

 entirely spined, spines as a rule increasing in length towards the 

 center of the scleres, and often ending there in rounded knobs. 



Gemmoscleres birotulates of two more or less distinct length groups, 

 only slightly differing from each other, or identical, in their rotules 

 and general outline; the shafts of both series often stout and cylindri- 

 cal and covered with erect conical spines. 



Gemmules moderately large to large, subspherical to spherical, scat- 

 tered throughout skeletal mesh work, usually abundant; pneumatic 

 layer well developed but typically not very thick, consisting of minute 

 spherical air spaces; gemmoscleres embedded in this layer strictly 

 radially, the outer rotules of the shorter series either concealed in 

 the pneumatic coat or slightly surpassing it, those of the fewer longer 

 series always considerably reaching beyond the outer gemmulai 

 membrane; foramen distinctly tubular, porus tube ranging from 

 moderately long to very long in the various species; distolateral 

 margins of tube often expanded and rimhke, with or without cirrous 

 appendages of varying length and arrangement. 



Sponges forming flat to massive encrustations, with surfaces rang- 

 ing from smooth to irregularly papillose; associations with zoochlorel- 

 lae frequent, and consequently coloration a varying shade of green. 

 Consistency ranging from soft to moderately firm. 



