HYALONEMA (PHTAI>ONEMA) 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 m. (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 and 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; 6, 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; I, the length of 

 the large micramphidiscs; m, the average proportion of the length to the breadth 



