22 PROCEEDINGS OP THE NATIONAL MUSEUM vol. 81 



The microxyhexactins of this subspecies have a much more robust 

 appearance than those of the typical form but are otherwise very 

 similar. 



Another difference between this and the typical form is in the 

 length of the distal ray in the dermal pinules. In the present sub- 

 species it averages lOOytt to 150/a in length, while that of the typical 

 form is usually 200/* to 250/x. 



HYALONEMA (CYLICONEMA) HOZAWAI, new species 



Figure 2 ; Plate 1, Figures 3, 5 



The two specimens (Table 9) for which I establish this species 

 are entirely different in shape and of totally different size. The 

 extreme differences between the two specimens originally led me to 

 consider the establishment of two distinct species, but microscopic 

 examination shows them to agree in the spiculation to such an extent 

 that I have concluded to place both in one species. 



Specimen A is tulip-shaped, abruptly truncated terminally, 85 mm 

 long and 62 mm broad above, 30 mm broad below. The oscular 

 sieve plate is nearly circular, deeply concave, and raised toward the 

 margin. The pores of the sieve plate are tolerably numerous, more 

 or less circular, and vary in size from 3 mm to 5 mm. The sponge 

 body in alcohol is light grayish. 



Specimen B (holotype, U.S.N.M. No. 22030) has a spindleliice 

 form. The upper end is not transversely truncated, but extends to 

 a somewhat pointed apex, in the form of a projecting fez, 35 mm 

 in height, which part may constitute the gastral surface, being 

 directed straight forward. The conelike gastral surface is even and 

 smooth, the excurrent canalar apertures being concealed by the 

 thickened gastral membrane. The basal tuft, except for an encrusta- 

 tion near the loAver end, is free of Palythoa. It measures 70 cm 

 in length. 



Table 9. — Record of specimens of Hyalonema (Cyliconema) hozawai 



Spiculation. — The most numerous parenchymal macroscleres are 

 oxydiactins. Those of the common type are very slender and smooth 

 over the entire surface, and make up a small, strongly curved strand. 

 They vary from 1 mm to 2 mm in length and from 12ju to 16/a thick at 

 the center. The other type, sparselj^ scattered in the ectosome and in 

 the choanosome, is also smooth over the entire surface and straight. 



