PLATE 81. 
Hyalonema (Leptonema) campanula LeNDENFELD. 
Figures 1-26. 
1, 2.— Parts of a diactine pinule; magnified 300; phot. Zeiss, apochr. 8, compens. oc. 12: 
1, the middle- and end-parts of the distal ray; 
2, the central part of the spicule. (The lower end of fig. 1 fits on to the upper end of fig. 2). 
3-6.— Microhexactines; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 12: 
3, a larger one, focussed lower; 4, focussed higher; 5, a smaller one, focussed lower; 6, focussed 
higher. 
7-10.— Macramphidises, and a part of one, magnified 500: 
7, 8, phot. Zeiss, apochr. 8, compens. oc. 12; 
9, 10, phot. Zeiss, H. 1. apochr. 2, compens. oe. 6; 
7, a macramphidise with straight shaft; 
8, a macramphidise with strongly bent shaft; 
9, a macramphidise with slightly bent shaft, focussed low (on the shaft); 
10, the lower of the two anchors of the spicule represented in fig. 9 focussed higher (on the tips 
of the upper teeth). 
11.— Part of a stalk-spicule; magnified 30; phot. Zeiss, planar 20 mm. 
12, 13.— Two pentactine pinules with long and slender distal ray; magnified 100; phot. Zeiss, apochr. 
16, compens. oc. 6. 
14.— Part of a group of diactine pmules; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 
15.— View of the specimen; natural size; phot. Zeiss, anastig. 480/412 mm. 
16-18.— Three pentactine pinules with long and slender rays; magnified 300; phot. Zeiss, apochr. 8, 
compens. oc. 6. 
19, 20.— Apical views of the lateral rays of two pentactine megascleres; magnified 50; phot. Zeiss, 
apochr. 16, compens. oe. 2. 
21, 22.— Micramphidiscs; magnified 500; phot. Zeiss, apochr. 4, compens. oc. 12. 
23, 24— Mesamphidises; phot. Zeiss, apochr. 8, compens. oc. 12. 
25, 26.— Pentactine pinules with short and stout distal ray from the basal part of the sponge; magnified 
300; phot. Zeiss, apochr. 8, compens. oc. 12: 
25, a single one; 
26, a group in situ in a section, 
