PLATE 67. 
Hyalonema (Hyalonema) tenuifusum LENDENFELD. 
Figs. 1-7, 9, 13-17 —specimen a. 
Figs. 8, 10-12, 18-26 — specimen b. 
1.— View of specimen a; reduced 1: 0.84; phot. Zeiss, anastig. 480/412 mm. 
2-5.— Large macramphidises and parts of same of specimen a; magnified 500; phot. Zeiss, apochr. 4, 
compens. oc, 6: 
2, a whole macramphidise focussed low (on the shaft) ; 
3, one of the terminal anchors of the same spicule, focussed high (on the tips of the uppermost teeth) ; 
4, a terminal anchor of another macramphidisc, focussed high (on the tips of the uppermost teeth); 
5, the same terminal anchor, focussed low (on the shaft). 
6, 7.— Acanthophores of specimen a; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6: 
6, a tetractine; 
7, a diactine. ; 
8.— Tetractine microhexactine-derivates of specimen b; magnified 500; phot. Zeiss, H. I. apochr. 2, 
compens. oc. 6. 
9.— Microhexactine of specimen a; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 12. 
10, 11.— Parts of a tetractine microhexactine-derivate of specimen b; magnified 2000; u. v. phot. Zeiss, 
q. monochr. 1.7, q. oc. 10: 
10, part of the distal portion of a ray; 
11, the central part of the spicule. 
12.— The central part with the tyle of a minute centrotyle amphiox of specimen b; magnified 2000, 
u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 
13-26.— Amphidises; magnified 500: 
13-17, of specimen a; 
18-26, of specimen b; 
13, 14, 16-21, 25, phot. Zeiss, H. I. apochr. 2, compens. oc. 4; 
15, 22-24, 26, phot. Zeiss, apochr. 4, compens. oc. 12; 
13, 14, 22-25, small macramphidises; 
15, 26, large macramphidises; 
16-21, micramphidiscs. 
