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HYALONEMA (HYALONEMA) AGASSIZI. 
Hyalonema (Hyalonema) agassizi, sp. nov. 
Plate 41, figs. 1-14; Plate 42, figs. 1-59; Plate 43, figs. 1-7; Plate 44, figs. 1-30; Plate 45, figs. 1-64; 
Plate 46, figs. 1-16; Plate 47, figs. 1-13. 
Eleven more or less complete specimens and three fragments of this species 
were trawled in the Tropical Pacific at five stations. One of these sponges is a 
very fine specimen, the best in the collection. It is therefore appropriate to 
name this new species after the leader of the several Albatross expeditions which 
brought home the material here reported on. 
Two of the five specimens from Station 4742 are cake-shaped, the three 
others more elongate, pear- or top-shaped. The general appearance and the 
spiculation of the fragments indicate that they are parts of similar pear- or top- 
shaped sponges. The two cake-shaped specimens from Station 4742 appear to 
be identical in structure among themselves, but to differ from all the rest. The 
same is to be said of the three pear- or top-shaped specimens and the fragments 
from the same station, and of the three specimens from Station 4740. The speci- 
mens from the three other stations all differ from each other and from the rest. I 
shall, for the reasons given below, describe these six different kinds as distinct 
“forms”:— 
A, the one taken at Station 4656 on 13 November, 1904; 6° 54.6' S., 83° 34.3' 
W. ; depth 4063 m. (2222 f.); bottom composed of fine, green mud mixed 
with gray ooze; the bottom-temperature was 35.2°. 
B, the one taken at Station 4651 on 11 November, 1904; 5° 41.7' S., 82° 59.7' W. ; 
depth 4063 m. (2222 f.) ; bottom a sticky, fine gray sand; bottom-tempera- 
ture 35.4°. 
C, the three from Station 4740 taken on 11 February, 1905; 9° 2.1' S., 123° 20.1' 
W. ; depth 4429 m. (2422 f.); bottom composed of dark gray Globigerina 
ooze; bottom-temperature 34.2°. 
D, the one taken at Station 3684 (A. A. 17) on 10 September, 1899; 0° 50' N., 
137° 54' W.; depth 4504 m. (2463 f.); bottom light yellow-gray Globi- 
gerina ooze. 
E, the two caked-shaped specimens, and 
F, the three pear- or top-shaped specimens and the fragments, all from Station 
4742, on 15 February, 1905 ; 0° 3.4' N., 117° 15.8' W.; depth 4243 m. (2320 
f.); bottom composed of very light, fine Globigerina ooze; bottom- 
temperature 34.3°. 
Shape and size. The single specimen of form A (Plate 41, fig. 2) is well- 
