554 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 54. 



The larger microxea (/) slender, more or less angularly curved, 

 sharply pointed at proximal end, and provided with lance-head at 

 distal end, 180-400/t long and 6-8/a thick in the middle. 



The smaller microxea (g) very short, straight, or slightly curved, 

 provided with lance-head, 60-80/;i long and 6-8/* thick in the middle. 



Locality. — Off Cape Monati, Bering Island, Comandorski Islands 

 (Station 4790, 64 fathoms; Station 4792, 72 fathoms). 



Remarks. — The other two specimens (Cat. Nos. 9176 and 9177, 

 U.S.N.M.) on hand are much larger than the type-specimen. One 

 of them (pi. 85, fig. 13) is of an elongate ovoid shape, measuring 

 about 60 mm. in length and 35 mm. in greatest breadth. The oscu- 

 lum is irregularly circular, with a diameter of about 8 mm. The 

 dermal surface is uneven and moreover strongly hispid, due to pro- 

 jecting tufts of large oxea. The sponge wall is thickest in the basal 

 parts (about 10 mm. thick) and becomes gradually thinner toward 

 the oscular margin. The gastral surface is perforated by numerous 

 circular or oval apertures of exhalant canals, up to 3 mm. in diameter. 



The second specimen agrees well with the first in both external 

 and internal features. Plate 85, figure 14, represents a portion of it, 

 as seen from the gastral surface. In this specimen, the hispidity of 

 dermal surface as well as the oscular fringe are very weakly repre- 

 sented. The wall measures about 8 mm. in greatest thickness. 



With regard to the microscopical structure of the above two speci- 

 mens, there is an essential agreement with the type-specimen, though 

 not without some points of deviation in their spiculation which re- 

 quire special mentioning. In both of them, the dermal triradiates, 

 the quadriradiates of chamber layer, and the large oxea are found 

 in dimensions on the whole somewhat larger than in the type- 

 specimen. In addition to the quadriradiates, there may occur in the 

 chamber layer a small number of similar triradiates. The microxea 

 are found in greater abundance than in the type-specimen. They 

 can not be distinguished into the larger and the smaller form so 

 readily as in the latter. 



13. LEUCOPSILA STYLIFERA (O. Schmidt). 



Plate 85, figs. 15, 16. 



Leuconia stilifera O. Schmidt, Atlant. Spong., 1870, p. 73, pi. 2, fig. 24. 



Leuconia stilifera Haeckel, Prodromus., 1870, p. 247. 



Leucandra stilifera Haeckel, Kalkschwamme, 1872, p. 225, pi. 33, figs. 



4a-4/; pi. 40, fig. 11. 

 Leucopsila stylifera Dendy and Row, Proc. Zool. Soc. London, 1913, p. 776. 



There exist five specimens of the species in the collection (Cat. 

 Nos. 9169, 9174, 9175, 9179, U.S.N.M.). They are either tubular 

 solitary individuals or irregular colonies consisting of a few per- 

 sons broadly connected together and indicated by the several 

 oscula present. The largest specimen (pi. 85, fig. 15), upon 



