346 



HYALONEMA (OONEMA) DENSUM. 



Number 



Length, 



142.04 — 156.25-1 

 156.25—171.87 

 171.87 — lS9.064n- 

 189.06 — 207.97 

 207.97 — 228.76 

 228.76 — 251.64-4 

 251.64—276.81 

 276.81 — 304.49 

 304.49 — 334.93- 

 334.93 — 368.43- 

 368.43 — 405.27 

 405.27 — 445.80 

 445.80 — 490.38- 

 490.38 — 539.42- 

 539.42 — 593.36- 

 593.36 — 652.70- 



Fig. 22. — Aniphidiscs. 



four elevations coincide with the four morphological groups above referred to. 

 There can be no doubt, therefore, that we have here to deal with four distinct 

 kinds of amphidiscs. The group A is very clearly distinguished from all the 

 others, both morphologically and biometrically. The group B is clearly dis- 

 tinguished morphologically from all other groups, but distinguished biometri- 



