PLATE 27. 



Farrea occa scutella Lendenfeld. 

 Figures 1-17. 



I. — A clavule with large teeth; magnified 200; phot. Zeis.s, apochr. 8, compens. oc. 6. 



2-5. — Centres (anchor-heads) of two clavules with large teeth; magnified 500; phot. Zeiss, apochr. 4, 

 compens. oc. 12: 



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, compens. oc. 6: 



a, apical view of a pentactine; b, a clavule with large teeth; c, oxyhexasters. 



7, 8. — Centre (anchor-head) of a clavule with large teeth; magnified 500; phot. Zeiss, apochr. 4, com- 



pens. oc. 12: 

 7, focussed high; 8, focussed lower. 

 9, 10. — Centre (anchor-head) of a clavule with large teeth and apical protuberance; magnified 500; 



phot. Zeiss, apochr. 4, compens. oc. 12; 

 9, focussed high; 10, focussed lower. 



II. — A clavule 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, apochr. 4, 



compens. oc. 12. 



13, 14. — The centre (anchor-head) of a clavule with large, conspicuously spined teeth; magnified 2000; 



u. V. phot. Zeiss, q. monockr. 1.7, q. oc. 10: 

 13, 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-head 



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; magnified 



2000; phot. Zeiss, q. monochr. 1.7, q. oc. 10; 

 16, focussed high; 17, focussed low. 



