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'. Since, however, it 

 differs from these species by its superficial pentactines, which are much more 

 spiny than in either E. boiverbankii or E. marshalli, and since its hemioxyhexasters 

 have relatively longer end-rays than those of E. bowerbankii - and relatively 

 shorter end-rays than those of E. marshalli,^ 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 imn. 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 httle 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 ^ thick. The 

 meshes of the network are, in the inner, gastral parts of the tube-waUs, 100-300 n 

 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 n 

 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 



' F. E. Schulze. Rept. Voy. ChaUenger, 1887, 21, p. 297. 

 2 F. E. Schulze. hoc. cil., pi. 79, fig. 13. 

 ' F. E. Schulze. Loc. cit., pi. 79, fig. 3. 



