Hyalonema (Oonema) sequoia LENDENFELD. 
Figures 1-36. 
a 
PLATE 89. ; { 
1 
1—5.— Large superficial amphioxes (tignules); magnified 20; phot. Zeiss, planar 20 mm. 
6-14.— Large micramphidises; magnified 500: ; 
6, 7, 9-14, phot. Zeiss, H. I. apochr. 2, compens. oc. 6; 
8, phot. Zeiss, apochr. 8, compens. oc. 12. 
15.— Group of spicules from a Solem Deanna oe of the superficial part of the body; magnified 20; 
phot. Zeiss, planar 20 mm.: 
a, slender amphioxes; b, stout amphioxes; ec, large superficial pinules; d, small macramphi- 
dises; e, large amphidises, probably of Hyalonema agassizi and foreign to the sponge, which 
are remarkably frequent. 
16-19.— An abnormal amphidise with reduced anchors; magnified 500; phot. Zeiss, H. I. apochr. 2, 
compens. oc. 6: 
16, one end, focussed high; 
17, the whole spicule, focussed lower; 18, focussed still lower; 
19, the other end, focussed lowest. 
20-30.— Small micramphidises; magnified 500; phot. Zeiss, H. I. apochr. 2, compens. oc. 6. 
31, 32.— End-parts of anchor-teeth of large macramphidises; magnified 500: 
31, phot. Zeiss, apochr. 8, compens. oc. 12; 
32, phot. Zeiss, apochr. 8, compens. oc. 6. 
33.— A somewhat abnormal small macramphidisc; magnified 500; phot. Zeiss, apochr. 8, compens. 
oc. 12. 
34.— A small micramphidise; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 
35, 36.— An abnormal small macramphidise; magnified 500; phot. Zeiss, apochr. 8, compens. oc. 12; 
35, focussed higher; 36, focussed lower, 
o 
