PLATE 13. 
Lanugonychia flabellum LrnDENFELD. 
Figures 1-28. 
1.— The distal part of an end-ray of a large discohexaster; magnified 600; phot. Zeiss, apochr. 4, com- 
pens. oc. 12. | 
2.— Part of a large discohexaster; magnified 600; phot. Zeiss, apochr. 4, compens. oc. 12. 
3.— Part of small discohexaster; magnified 600; phot. Zeiss, apochr. 4, compens. oc. 12. 
4.— Fairly large discohexaster; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 
5, 6.— Groups of spicules from spicule-preparations; magnified 200; phot. Zeiss, apochre 8, compens. 
oc. 6: 
a, large discohexasters; b, onychhexasters; c, angularly bent, hexactine-derivate diactine. 
7.— Part of the dictyonal skeleton of the stalk; magnified 30; phot. Zeiss, planar 20 mm. 
8.— View of the specimen; natural size; phot. Zeiss, anastig. 480/412 mm. (The stalk is detached 
from the body proper, there is a complete interruption between them at a). 
9-13.— Megascleres; magnified 30; phot. Zeiss, planar 20 mm.: 
9, side-view of a large pentactine; 
10, apical view of the lateral rays of a small pentactine; 
11, part of a large rhabd; 
12, apical view of the lateral rays of a small pentactine; 
13, side-view of a small pentactine. 
14.— Part of the lamellar sponge-body in transmitted light; magnified 3; phot. Zeiss, anastig. 167 mm. 
15.— Group of microscleres from a spicule-preparation; magnified 200; phot. Zeiss, apochr. 8, compens. 
oc. 6: Fi 
a, discohexasters; b, onychhexasters. 
16.— Group of megascleres from a spicule-preparation; magnified 10; phot. Zeiss, planar 50 mm.: 
a, large, partly broken pentactines; b, small pentactine. 
17-26.— Ends of end-rays of discohexasters; magnified 2000; u. v. phot. Zeiss, gq. monochr. 1.7, q. oc. 10. 
27.— End of an end-ray of an onychhexaster; magnified 2000; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 
28.— Hexactine-derivate with only one fully developed ray; magnified 600; u. v. phot. Zeiss, q. monochr. 
6, q. oc. 10. 
