NO. 2247. SPONGES FROM NORTHWESTERN PACIFIC— HOZAWA. 549 



first backwards and then forwards; irregular in outline, 170-330/* 

 long and 20/* thick at base. Apical ray very short, tapering to sharp 

 point, up to 70/* long. 



Microxea (/) obtusely or sharply pointed at the inner end, more 

 or less hastate and sharply pointed at the outer end. They are of 

 v more or less irregular outline, being usually thickest nearest the 

 inner end than the outer. 



Locality. — Off Osesaki, Province Hizen in Kiushu (Station 4894, 

 95 fathoms). 



Remarks. — This species is distinguished from Leucandra tuba, new 

 species, by its remarkable external form, by having no proper oscular 

 skeleton, by the presence of gastral quadriradiates, and by some 

 other points of detail in the spiculation. It differs from Leucandra 

 pocuUformis, new species, by its external form, by the dimensions 

 and characters of spiculation, etc. 



11. LEUCANDRA KURILENSIS, new species. 



Plate 85, fig. 11. 



This species is represented by a single specimen in the collection 

 (Cat. No. 9173, U.S.N.M.). The sponge (pi. 85, fig. 11) represents a 

 solitary individual of a strongly laterally compressed oval shape 

 attached by its one side to a foreign body. A circular osculum of 

 about 1| mm. and surrounded by a fringe of oxea opens near one 

 end of the body. Total length, including the oscular fringe, about 

 12 mm.; greatest breadth, about 8mm.; thickness of wall, about 1 

 mm. The dermal surface is slightly rough from the projecting ends 

 of oxea ; the gastral surface is smooth, but is perforated by uniformly 

 distributed circular exhalant apertures 0.4-0.5 mm. wide. The color 

 in alcohol is grayish white. The texture is fairly firm. 



Structure. — Unfortunately it is difficult to exactly determine the 

 state of the canal system, owing to the bad state of preservation, but 

 it seems to be of the sylleibid type, intermediate between the syconoid 

 and the leuconoid. The flagellate chambers are more or less elongate 

 and are arranged radially around the wide exhalant canals. 



The dermal skeleton is well developed, attaining a thickness of 

 about one-third that of the sponge wall or even somewhat thicker. 

 It is made up of tangential triradiates in many confused layers. 

 Large oxea and finer linear spicules project from the dermal sur- 

 face, their proximal parts being imbedded in the chamber layer. The 

 tubar skeleton consists in the main of irregularly distributed tri- 

 radiates, but shows an indication of the articulate character in the 

 presence of subgastral sagittal triradiates in a small number. The 

 gastral skeleton is thin, consisting of triradiates closely set and dis- 

 posed parallel to the gastral surface in several layers. The oscular 

 margin contains large oxea and finer linear spicules which form a 

 dense fringe, as well as regularl}^ and closely set triradiates. which 



