26 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.81 



openings of the other specimen, evidently a large fragment of 

 the superior regions of the sponge body consisting of a strongly 

 compressed lamella, are poorly preserved. (Table 10.) 



Table 10. — Record of specimens of Hyalonema (Coscinonema) kirkpatricki 



globosum 



The chief differences between the typical form and the new sub- 

 species are in the type of macramphidisk and in the much longer 

 dermal pinules. In the present form, the macramphidisk seems 

 somewhat smaller, measuring 200/x, to 260/a long, and bearing on 

 its shaft numerous tubercles, not only on the shaft center, as in the 

 typical form, but also on the entire surface. In this spicule, the 

 comj)arative dimensions of the length and breadth of the terminal 

 disks and the entire length of the spicule are somewhat different from 

 those of the typical form. This fact may account for the complete 

 dissimilitude of the configuration of the two. 



The distal ray of the pinules, varying from I8O/1, to 560/* in length, 

 is longer than in typical kirkpatricki. 



Because of these differences, I consider the present specimens as 

 representing a distinct form of H. {Coscinonema) kirkpatricki Ijima. 



HYALONEMA (COSCINONEMA) OVATUM, new species 



FiGUBE 3; Plate 2, Figure 2 



The fairly large and completely preserved specimen of this new 

 species (holotype, U.S.N.M. No. 22032) was taken from a depth 

 of 918 fathom's, SSW. of Omaizaki (Station 5084). The body of 

 the sponge is oval, 86 mm long, 45 mm broad, and dorsoventrally 

 or posteroanteriorly slightly compressed. It is difficult to say 

 whether this compression and rugosity were present in the living 

 sponge or whether they were produced post mortem by pressure. 

 The anterior oscular depression is very narrow and shallow, measur- 

 ing about 30 mm in width. The root tuft where it arises from the 

 lower end of the sponge body has entirely fallen off, but the point 

 of attachment is indicated by the destruction of the dermal mem- 

 brane. Through the compact and somewhat transparent quadratic 

 dermal reticulation of the outer surface one can not see the sub- 

 dermal cavities and the openings of the incurrent canals. 



Spiculation. — The important macrosclere parenchymalia are the 

 oxydiactins. These are mostly isolated, more rarely aggregated in 

 bundles, and appear abundantly throughout the interior. They are 



