PLATE 35. 
Hyalonema (Hyalonema) obtusum gracilis LENDENFELD. 
Figures 1-37. 
1.— Radial section through the gastral membrane on the outer wall of the gastral cavity; magnified 100; 
phot. Zeiss, apochr. 16, compens. oc. 6: 
a, pinule-fur. 
2.— Apical view of the lateral rays of a gastral pentactine pinule; magnified 300; phot. Zeiss, apochr. 4, 
compens. oc. 6. 
3.— Radial section through the gastral membrane on the oral cone; magnified 100; phot. Zeiss, apochr. 
16, compens. oc. 6: 
a, pinule-fur. 
4-9.— Side-views of gastral pinules; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6: 
4, a hexactine gastral pinule; 
5-9, pentactine gastral pinules. 
10-13.— Diactine pinules of the oral frill; magnified 100; phot. Zeiss, apochr. 16, compens. oe. 6. 
14, 15.— The end-part of a ray of a microhexactine; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, 
q. oc. 10: 
14, focussed higher; 15, focussed lower. 
16.— The surface of the oral cone viewed from above; magnified 100; phot. Zeiss, apochr. 16, compens. 
oc. 6. 
17.— Group of microscleres from a centrifuge spicule-preparation; magnified 300; phot. Zeiss, apochr. 
4, compens. oc. 6: 
a, microhexactines; b, small micramphidiscs. 
18-22.— Microhexactines and microhexactine-derivates; magnified 500; phot. Zeiss, H. I. apochr. 2, 
compens. oc. 6: 
18, 19, regular microhexactines; 
20-22, microhexactine-derivates with two well-developed and four less (20) or more (21) or quite 
(22) reduced rays. 
23.— Apical view of the lateral rays of a dermal pentactine pinule; magnified 300; phot. Zeiss, apochr. 
4, compens. oc. 6. 
24.— Radial section through the dermal membrane on the outer surface; magnified 100; phot. Zeiss, 
apochr. 16, compens. oc. 6: 
a, pinules; b, small macramphidisc. 
25.— Dermal pentactine pinule with angularly bent apical (distal) ray; magnified 300; phot. Zeiss, 
apochr. 4, compens. oc. 6. 
26-28.— The distal part (centrum and distal ray) of diactine pinules of the oral frill; magnified 300; 
phot. Zeiss, apochr. 4, compens. oc. 6. 
29-37.— Side-views of dermal pinules; magnified 300; phot. Zeiss, apochr. 4, compens. oc. 6: 
29, 30, hexactine dermal pinules; 
31-37, pentactine dermal pinules. 
