354 
HYALONEMA (OONEMA) SEQUOIA. 
larger ones, to which the part of the curve to the right of this depression refers, 
and which are 63-122 /x long, have anchor-teeth distally rather divergent. The 
smaller ones, to which the part of the curve to the left of the depression refers, and 
which are 17.5-52 /x long, have anchor-teeth distally nearly parallel. I therefore 
also divide the micramphidiscs into two subgroups : — large and small micram- 
phidiscs. It is to be noted that these two kinds of micramphidiscs do not 
differ so much from each other as the two kinds of macramphidiscs. I distin- 
CO 
3 
"O 
nr 
cl 
a 
*0 
nr 
Fig. 23. — Amphidiscs. 
