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 ix 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 n 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- 



Length 



:=; r. \ "^ Number 



r 



n 



3 

 W 



o 



15 

 17 

 19. 

 21. 

 23 

 25 

 28 

 30 

 34 

 37, 

 41 

 45 

 49, 

 54, 

 60 

 66 

 72, 

 80 

 88 

 97 



86 — 

 .45 — 

 19 — 

 11 — 

 23- 

 55 — 

 10- 

 91 — 

 .00 — 

 .40 — 

 .14 — 

 .26 — 



17.45 



19.19 



21.11 



23.23-t- 



25.55 



28.10 



30.91-1- 



34.00 



37.40H 



41.14' 



45.26 



49.78 



.78— 54.76-—/^ 



> 

 3 



2:106, 



w 129, 

 £ 142. 

 • 156 

 171 

 189 

 207, 

 228 

 251 

 276 

 304 

 334 

 368 

 405 

 445, 

 490, 

 539 

 573, 



60.24 

 66.26-1- --t 

 72.89 

 80.18-f 

 88.20 

 97.02 

 106.72-- 

 1 17.39- 

 129.13-- 

 142.04 

 156.25-1- 

 .25—171.87 

 87 — 189.06- 

 06—207.97 

 97 — 228.76 

 .76 — 251.64 

 64 — 276.81 



76- 

 24- 

 26- 

 ,89- 

 .18- 

 20- 

 02- 

 ,72 - 

 39- 

 13- 

 04- 



.81 

 .49- 

 93- 

 .43- 



- 304.49 



- 334.93 



- 368.43 

 -405.27 



.27 — 445.80 

 80 — 490.38 

 .38 — 539.42-. 

 42 — 573.33- 

 .33 — 630.66 



S. S' 



■a 

 a! 



3 



■o 



3" 



Fig. 23. — Amphidiscs. 



