PLATE 27. 
Farrea occa scutella LENDENFELD. 
Figures 1-17. 
1.— A clavule with large teeth; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 
2-5.— Centres (anchor-heads) of two clavules with large teeth; magnified 500; phot. Zeiss, apr oc 
compens. oc. 12: Ly 
2, a clavule-head focussed high; 
3, the head of the same clavule focussed lower; 
4, another clavule-head focussed high; 
5, the head of the same clavule focussed lower. 
6.— Group of spicules from a spicule-preparation; magnified 200; phot Zeiss, apochr. 8, » COT 
a, apical view of a pentactine; b, a clavule with large teeth; ¢, oxyhexasters. : 
7, 8.— Centre (anchor-head) of a clavule with large teeth; magnified 500; phot. Zeiss,, apochr. 
pens. oc. 12: 
7, focussed high; 8, focussed lower. 
9, 10.— Centre (anchor-head) of a clavule with large teeth and apical protuberance; magnifi 
phot. Zeiss, apochr. 4, compens. oc. 12: 
9, focussed high; 10, focussed lower. 
11.— A elavule with large teeth; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6. 
12.— The centre (anchor-head) of a clavule with small teeth; magnified 500; phot. Zeiss, | 
compens. oc. 12. 
13, 14.— The centre (anchor-head) of a clavule with large, conspicuously spined teeth; magnified 
u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 
18, focussed a little higher; 14, focussed a little lower. 
15.— The apical protuberance of a clavule with large teeth similar to the one whose anchor-h 
is represented in figs. 9, 10; magnified 2000; phot. Zeiss, q. monochr. 1.7, q. oc. 10. 
16, 17— The centre (anchor-head) of a clavule with large teeth hardly perceptibly spined; mag 
2000; phot. Zeiss, q. monochr. 1.7, q. oc. 10: 
16, focussed high; 17, focussed low. 
