FARREA. 
125 
when held together with the fact that the specimens of F. o. foliascens were 
trawled in the tropical Atlantic, whilst the sponges described above come from 
the eastern Pacific. 
Farrea sp.? 
Plate 32, figs. 1-3. 
There are in the collection one large and three small fragments of skeleton- 
nets of this sponge, all trawled off the southern coast of western Panama, at 
Station 4631, 3 November, 1904; 6° 26' N., 81° 49' W.; depth 1415 m. (774 f.) ; 
they grew on green sand; the bottom-temperature was 38.0°. 
The large fragment (Plate 32, fig. 1) is 36 mm. long and appears as a part of 
the skeleton-net of a tube nearly circular in transverse section and about 10 mm. 
wide. Very short branch- tubes about 6 mm. wide arise from this tube, which 
can be considered as a main-tube. Attached to both sides of this skeleton-net 
are portions of network which form short tubular covered ways about 3 mm. 
high and broad. 
The skeleton-net (Plate 32, figs. 2, 3) of the main-tube and its branches 
forms a single layer and chiefly consists of smooth, longitudinal, and transverse 
beams, mostly 80-140 n thick. Here and there a short oblique beam of similar 
thickness is observed. The meshes are mostly square, rectangular, 350-600 /x 
long, and 180-240 /x broad. A few are triangular. From each node of this net- 
work two thorns arise, one directed towards the inner gastral surface, the other 
towards the outer dermal surface. These thorns are conic, vertical to the sur- 
face, about 50 ix thick at the base, and covered with very blunt spines. The 
gastral ones attain a considerable length. The skeleton-net composing the 
walls and roofs of the covered ways above mentioned is irregular and has 
mostly triangular meshes. 
A large number of hexactines 80-140 m in diameter are attached, with one 
ray, to the beams of these networks. In places, other similar hexactines are 
soldered to these, forming here and there a fine net. 
The sponges to which these skeleton-nets belonged can be assigned with a 
considerable degree of certainty to Farrea. 
Farrea sp.? 
There are in the collection four slightly curved, small fragments, the largest 
19 mm. long, of simple skeleton-nets extending in two directions (one surface) 
only. These skeleton-nets were trawled in the southeastern Pacific, at Station 
