HYALONEMA (PHIALONEMA) PATERIFERUM. 
373 
1891; 5° 43' N., 85° 50' W. ; depth 1788 m. (978 f.); they grew on white Globi- 
gerina ooze; the bottom-temperature was 37.5°. One specimen of form A was 
trawled off Panama, at Station 3376, on 4 March, 1891; 3° 9' N., 82° 8' W. ; 
depth 2070 in. (1132 f.) ; it grew on gray Globigerina ooze; the bottom-tempera- 
ture was 36.3°. The two specimens of form B were trawled in the Central Tropi- 
cal Pacific at Station 3684 (A. A. 17) on 10 September, 1899; 0° 50' N., 137° 54' 
W. ; depth 4504 m. (2463 f.); they grew on light yellow-gray Globigerina ooze. 
The single specimen of form C was trawled off northern Peru at Station 4651, 
on 11 November, 1904; 5° 41.7' S., 82° 59.7' W., Aguja Point S. 83° E., 206 km. 
(Ill miles) ; depth 4063 m. (2222 f.) ; it grew on sticky, fine, gray sand; the bot- 
tom-temperature was 35.4°. The single specimen of form D was trawled off north- 
ern Peru W. S. W. of Aguja Point, at Station 4656 on 13 November, 1904; 
6° 54.6' S., 83° 34.3' W. ; depth 4063 m. (2222 f.); it grew on fine, green mud 
mixed with gray ooze; the bottom-temperature was 35.2°. The specimen of 
form E was trawled in the Eastern Tropical Pacific, at Station 4721, on 15 Janu- 
ary, 1905; 8° 7.5' S., 104° 10.5' W.; depth 3811 m. (2084 f.); it grew on 
light brown Globigerina ooze. The single specimen of form F was trawled in 
the Eastern Tropical Pacific at Station 4742, on 15 February, 1905; 0° 3.4' N., 
117° 15.8' W. ; depth 4243 m. (2320 f.); it grew on very light, fine Globigerina 
ooze; the bottom-temperature was 34.3°. 
There can, I think, be no doubt that the four sponges described above all 
belong to Wilson’s Hyalonema pateriferum. The specimens of this species studied 
by Wilson from the Stations 3363 and 3376 appear to be fairly identical with 
each other, but differ from all the rest. The specimens described by him from 
Station 3684 (A. A. 17) are likewise identical with each other arid different from 
all the rest. The four specimens examined by me, which all come from different 
stations, differ from each other and from the specimens described by Wilson. 
The following are the fourteen more important spicule-dimensions, of which 
the averages and the nature of the variation have been ascertained: — a, the 
length of the distal ray of the ordinary pinules; b, the basal thickness of this 
ray; c, the length of the lateral rays of the ordinary pinules; d, the diameter of 
the microhexactines ; e, the length of the large macramphidiscs ; /, the thickness 
of the shafts of these spicules; g, the average proportion of the length to the 
breadth of the anchors of these spicules; h, the length of the small macramphi- 
discs; i, the thickness of the shafts of these spicules; k, the average proportion 
of the length to the breadth of the anchors of these spicules; l, the length of 
the large micramphidiscs ; m, the average proportion of the length to the breadth 
