" 







SYSTEMATIC ACCOUNT OF THE GENERA 



AND SPECIES. 





HEXACTINELLIDA O. Schmidt 



AMPHIDISCOPHORA F. E. Schulze. 



HYALONEMATIDAE Gray. 





1832. 



1887. 

 1893. 



1894. 



Hyalonema Gray. 



Hyalonema Gray, 1832, p. 79. 

 Hyalonema Gray, Schulze, 1887, p. 189 



1893 a, p. 28 

 « 1894, p. 18. 





u 



Hyalonema ovuliferum F. E. Schulze. 



1899. Hyalonema ovuliferum E. E. Schulze, 1899, p. 13, Taf. ii. Eigs. 9-12. 



Station 338%. One fragmentary specimen, comprising the lower end of 

 what must have been a larger sponge than Schulze's type. 



The fragment is a solid, elongated, and bilaterally compressed mass, 

 through the middle of which the root spicules pass as a compact bundle. 

 The root spicules are broken off 10 mm. below the rounded lower end of 

 the sponge, and do not quite project from the upper end. Over the upper 

 end of the fragment the dermalia and hypodermalia and the peripheral 

 layer of parenchymal hexacts are absent, and this end doubtless represents 

 the place at which the upper part of the body was broken away. The 

 sponge is compact, although soft and easily torn. The surface, which is 

 much injured, shows the apertures of numerous small canals not exceeding 

 1 mm. in diameter. The piece is 50 mm. long, with transverse diameters 



of 25 and 15 mm. respectively. 



At the extreme lower end the sponge tissue round the emerging root 

 tuft is not differentiated to form a hard and dense mass (basal collar-pad), 



. 





