PLATE 45. 
Hyalonema (Hyalonema) agassizi LENDENFELD. 
Figs. 1-38, 40-49 — form A, Station 4656. 
Figs. 39, 62-64 —form D, Station 3684 (A. A. 17). 
Figs. 50-53 —form B, Station 4651. 
Figs 54-61 —form C, Station 4740. 
1-4.— Stout-rayed tetractine acanthophores of the spicule-cement in the basal part of form A; magnified 
100; phot. Zeiss, apochr. 16, compens. oc. 6. ; 
5.— Part of a rhabd acanthophore of the spicule-cement of the basal part of form A; magnified 100; 
phot. Zeiss, apochr. 16, compens. oc. 6. : 
6-13.— Hexactine megascleres of form A; magnified 50; phot. Zeiss, achr. aa, compens. oc. 6: 
6-8, 11, small ones; 
9, 10, large ones; 
12, 13, medium-sized ones. 
14-17.— Stout-rayed acanthophores of the cement in the basal part of form A; magnified 100; phot. 
Zeiss, apochr. 16, compens. oc. 6: 
14, 15, tetractines with one ray strongly reduced; 
16, 17, diactine tetractine-derivates. 
18.— Section vertical to the surface through a superficial part of form A; magnified 20; phot. Zeiss, 
planar 20 mm.: j 
a, dermal membrane with pinule-fur. 
19-22.— Rhabds of the choanosome of form A; magnified 50; phot. Zeiss, achr. aa, compens. oc. 6: 
19, 21, 22, amphioxes; 
20, a tylostyle. 
23.— Section vertical to the surface through a superficial part of form A; magenta; magnified 100; 
phot. Zeiss, apochr. 16, compens. oc. 6: 
a, dermal pinule-fur. 
24, 25.— Stout-rayed tetractines, with rays strongly reduced in length, of the spicule-cement in the basal 
part of form A; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 
26-34.— Spheres of the basal part of form A; magnified 300; phot. Zeiss, apochr. 4, compens. oe. 6. 
35, 36.— Stout-rayed tetractine acanthophores of the spicule-cement of the basal part of form A; magni- 
fied 300; phot. Zeiss, apochr. 4, compens. oc. 6: 
35, a young one; 
36, an adult one. 
37.— A stout-rayed triactine acanthophore from the spicule-cement of the basal part of form A; magni- 
fied 300; phot. Zeiss, apochr. 4, compens..oc. 6. 
38.— A stout-rayed pentactine acanthophore with rays reduced in length, from the spicule-cement in 
the basal part of form A; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6. 
39.— A stout-rayed tetractine acanthophore from the spicule-cement in the basal part of form D; magni- 
fied 30; phot. Zeiss, apochr. 4, compens. oe. 6. 
40-64.— Amphidises; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. oc. 4: 
40-45, small micramphidises of form A; 
46-49, large micramphidises of form A; 
50-52, small micramphidises of form B; 
53, small macramphidise of form B; 
54-58, small micramphidises of form C; 
59-61, large micramphidises of form C; = 
62, small micramphidise of form D; 
63, 64, large micramphidises of form D. 
