Poe te Ve 
; 
F 
. 
% 
. 
? 
Se po 
m vans 
- a 
v = : thy 
a 
or 
Pak 
ve 
PLATE 107. 
Hyalonema (Prionema) crassum LENDENFELD. 
Figures 1-20. 
1, 2.— A large serrated macramphidise; magnified 500; phot. Zeiss, apochr. 8, compens. oc. 12: 
1, focussed high, on the uppermost teeth; 2, focussed lower, on the centre of the shaft. 
3, 4.— A terminal anchor of a large serrated ranernrtnatadiae: magnified 500, phot. Zeiss, H. I. a a 
compens. oc. 4: 
3, focussed high; 4, focussed a little lower. S 
5.— A medium-sized serrated macramphidisc; magnified 500; phot. Zeiss, apochr. 8, compens. oc. 12. — 
6-15.— Paratangential superficial amphioxes; magnified 50; phot. Zeiss, apochr. 16, compens. oc. 2: 
6-10, slender ones from the dermal membrane; 
11-15, stouter ones from the gastral membrane. 
16.— View of the largest specimen; natural size; phot. Zeiss, anastig. 480/412 mm. a 
17-20.— Parts of an anchor-tooth of a large serrated macramphidise; magnified 2000; u. v. phot. 
Zeiss, q. monochr. 1.7, q. oc. 10: £ 
17, the tip of the tooth, focussed high; 
18, the distal part of the same tooth, focussed lower; 19, focussed still lower; 
20, the middle-part of the same tooth, focussed lowest. 
ose ¥ 
> 
fs 
> 
a 
i 
- " 
4 
« 
a 
