HYALONEMA (OONEMA) HENSHAWI. 327 



covered with spines. One of them is broken off short; the other, which is 

 intact, is 23 /^ long and bears on the end a narrow and pointed anchor-rudiment 

 10 M long and 8 fi broad, similar in appearance to a half closed umbrella. 



There can be no doubt that the two sponges above described belong to 

 the same systematic unit. There can also be no doubt that they are very 

 nearly related to the sponge described by Wilson ^ as Hyalonema bianchoratum. 

 Indeed the similarity between them is so great that the Albatross specimens 

 must be considered as a variety of the species described by Wilson. 



The distal ray of the largest pinules is in the typical Hyalonema bianchora- 

 tum Wilson very much longer than in the sponges above described. Also in 

 shape the pinules do not quite agree, and while all the pinules of the former are 

 pentactine, some of the pinules of the latter are hexactine. The hypodermal 

 and hypogastral pentactines are larger in the former than in the latter. The 

 microhexactines of Wilson's type do not attain so large a size and have stouter 

 rays than those of the variety pinuUna. The shafts of the large macramphi- 

 discs are in the former stouter than in the latter. The small macramphidiscs 

 have in the former a centrotyle shaft and eight anchor-teeth; in the latter 

 a simple cylindrical shaft without tyle and quite often more than eight, some- 

 times as many as twelve, anchor-teeth. 



These differences, although insufficient for specific distinction, are quite 

 sufficient for varietal distinction. I therefore divide Wilson's Hyalo7iema 

 bianchoratum into two varieties: — var. typica (for Wilson's type) and var. pinu- 

 Una (for the sponges above described). 



Hyalonema (Oonema) henshawi, sp. nov. 

 Plate 97, figs. 1-36; Plate 98, figs. 1-7. 



One specimen of this species was trawled in the Eastern Tropical Pacific 

 at Station 4649 on 10 November, 1904; 5° 17' S., 85° 19.5' W.; depth 4086 m. 

 (2235 f.); it grew on a bottom of sticky, gray mud; the bottom-temperature 

 was 35.4°. 



I name it after the Director of the Museum of Comparative Zoology, 

 Mr. Samuel Henshaw. 



Shape and size. The single specimen (Plate 97, fig. 15) has the shape of 

 a deep, conical cup, rounded ofT below. The upper margin is lacerated. The 

 stalk, which, in life, doubtlessly projected from its lower end, has been com- 



'H. V. Wilson. Mem. M. C. Z., 1904, 30, p. 22, pi. 2, figs. 1-11. 



