34 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.81 



90 fi ill diameter. Its short, smooth, principal ray (8/a long as meas- 

 ured from the axial center) divides into 3 to 4 widely diverging, 

 straight terminals, two or three times the length of the principal ray. 

 These terminals have sharply pointed ends. Of the spicules irregu- 

 larly scattered throughout the parenchyme, I will describe the oxy- 

 hexactin (fig. 4, j) and oxypentactin in addition to the above-men- 

 tioned spicules ; the former seems to be more numerous than the latter. 

 They are very numerous everywhere, in the choanosome, ectosome, 

 and in the endosome. The oxyhexactin measures 130/x, to 140/* in 

 axial length and Qfx broad at the base. The rays are gradually 

 attenuated to the sharply pointed ends, and the surface is sparsely 

 roughened. The oxypentactin is of nearly the same size and has the 

 same features as the former spicule. 



FARREA WATASEI, new species 



Figure 5 ; Plate 3, Figure 1 



There is but a single specimen (holotype, U.S.N.M. No. 22035) 

 of this new species. It is fairly large and was obtained from a 

 depth of 682 fathoms near Petropavlovsk in Bering Sea (Station 

 4Y97). The sponge is of a somewhat large, thick-walled, irregular, 

 tubular configuration measuring 2 mm to 3 mm in the middle and 

 becoming gradually more or less thinner toward edges. The char- 

 acteristic dictyonal framework, which appears commonly in all mem- 

 bers of the genus Farrea, is distinctly present in this specimen 

 and is densely filled up by microscleres. The incurrent and excur- 

 rent canalar apertures are of nearly the same size and shape : mostly 

 small and circular, 0.3 mm to 0.5 mm in diameter. 



Spiculation. — The dictyonal framework of F. watasei for the 

 most part consists of two or more layers. Infrequently it is in 

 one layer, as in many other species of Farfea. In the many-layered 

 dictyonal framework, the radial beams extend between the layers, 

 which lie irregularly or parallel to one another. These radial beams 

 somewhat resemble tangential beams in their cylindrical shape, 

 though they are frequently roughened on the surface. The promi- 

 nences, which project from the outer and inner surface of the whole 

 latticework, measure 500/i to 600/x. They are always tuberculous. 

 The length of these freely projecting conical prominences varies as 

 much as their form within fairly wide limits. They are generally 

 straight or somewhat curved terminally, slender and shorter in 

 the younger portions, and longer on the surface of the many-layered 

 framework of the older regions. The breadth of the beams varies 

 considerably, from 60|U. to 90/x. 



Of the spicules in the loose parenchyme, which lies between the 

 dictyonal framework, the uncinate is first described. It exhibits an 



