EURETID. 
139 
Although the specimen at my disposal is but a small fragment there can be 
little doubt that it belongs to the group of sponges represented by Eurete bower- 
bankii F. E. Schulze and Eurete marshalli F. E. Schulze 1 2 . Since, however, it 
differs from these species by its superficial pentactines, which are much more 
spiny than in either E. bowerbankii or E. marshalli , and since its hemioxyhexasters 
have relatively longer end-rays than those of E. botoerbankii 2 and relatively 
shorter end-rays than those of E. marshalli, 3 it cannot be assigned to either of 
them and must be considered as a new species. 
Euretid from Station 4641. 
Plate 106, figs. 1-3. 
The supporting skeleton-nets of three euretids, one large fairly intact, and 
two small fragmentary ones, were trawled near Chatham Island, Galapagos, at 
Station 4641 on 7 November, 1904; 1° 34.4' S., 89° 30.2' W. ; depth 115 m. 
(633 f.); they grew on a light gray Globigerina ooze; the bottom-temperature 
was 39.5°. 
The larger supporting skeleton-net (Plate 106, fig. 3) is 47 mm. long and 
consists of a tube, 7 mm. wide, with nearly circular transverse section, which 
rises vertically from the base of attachment. This tube is straight for the greater 
part of its length, but bent abruptly to one side a little below its free upper end. 
Eighteen tubular branches, with a maximum length of 7 mm., and about as wide 
as the main-tube, arise from this tube. These branch-tubes are arranged in a 
spiral line. Some of them are distinctly widened distally, funnel-shaped. The 
basal part of the main-tube, and the lowest branch-tubes have walls about 2 mm. 
thick. Distally the walls become thinner, the uppermost being about 1 mm. 
thick. In the smaller specimens the main-tube is shorter and a little wider. 
The beams composing these skeleton-nets are, in the middle-part of the 
length of the main-tube of the largest specimen, mostly 40-80 m thick. The 
meshes of the network are, in the inner, gastral parts of the tube-walls, 100-300 /x 
wide and square with strongly rounded corners (Plate 106, fig. 1). In the outer, 
dermal parts of this portion of the skeleton-net the meshes are mostly 80-350 y. 
wide and more frequently triangular with rounded corners (Plate 106, fig. 2). 
The axes of the rays of the spicules, through the concrescence of which these 
1 F. E. Schulze. Rept. Voy. Challenger, 1887, 21 , p. 297. 
2 F. E. Schulze. Loc. cit., pi. 79, fig. 13. 
3 F . E. Schulze. Loc. cit., pi. 79, fig. 3. 
