126 EURETE ERECTUM. 



4685, on the 10 December, 1904. 21° 36.2' S., 94° 56' W. ; depth 4033 m. (2205 f .) ; 

 they grew on dark brown clay; the bottom-temperature was 35.3°. 



These skeleton-nets are very regular and composed of smooth longitudinal 

 and transverse beams, 40-60 /i thick, which enclose square rectangular meshes 

 about 750 n long and 200-350 m broad. 



The sponges to which these skeleton-nets belonged can be assigned with a 

 considerable degree of certainty to Farrea. 



EURETE Semper. 



Euretidae composed of anastomosing tubes without central calyculate 

 structure. With scopules, without clavules. 



The collection contains three specimens of this genus which belong to three 

 species, one of which is new. 



Eurete erectum F. E. Schulze. 

 Plate 30, figs. 1-17; Plate 31, figs. 1-28. 



Eurete erectum F. E. Schulze, Amerikanische Hexactinelliden, 1899, p. 72, taf . 17, figs. 1-3. 



Etirete erectum subsp. lubuliferum H. V. Wilson, Mem. M. C. Z., 1904, 30, p. 63, pi. 7, figs. 9, 12; pi. 8,figs. 



1-3, 6. 

 Eurete erectum subsp. gracile H. V. Wilson, Mem. M. C. Z., 1904, 30, p. 69, pi. 8, figs. 4, 5, 8, 9; pi. 



9, figs. 1, 3, 5. 



Two specimens of this species, a fairly complete larger and a fragmentary 

 smaller one, were trawled off the southern coast of western Panama, at Station 

 4622 on 21 October, 1904; 6° 31' N., 81° 44' W.; depth 1067 m. (581 f.); they 

 grew on green sand and rock. 



Shape and size. The larger specimen (Plate 30, fig. 16) is a tube with quite 

 regular circular transverse section. This tube is .slightly spirally twisted, 67 mm. 

 long, and throughout about 14 mm. in (outside) diameter. Its wall is 1-1.5 mm. 

 thick and perforated by seven apertures. These are circular, arranged in a 

 regular spiral, about 10 mm. wide, and surrounded by slightly protruding rims. 

 The rims are in some places 5 mm. high and above strongly curved outward. 

 They appear as rudiments of wide calyculate branches of the main-tube. The 

 smaller specimen is a fragment of a similar but wider tube. It is 30 mm. long 

 and the main-tube, of which it formed a part, must have been about 17 mm. in 

 diameter. 



A thin, membranous alcyonarian colony, the outer surface of which extends 

 in the level of the tips of the distal pinule-rays, covers large tracts of the outer 

 dermal surface of the sponge. 



