330 
HYALONEMA (OONEMA) HENSHAWI. 
amphidiscs, which, as they are the largest forms, I name macramphidiscs. All 
the other amphidiscs differ morphologically from these but are similar among 
themselves. They can, as they comprise the small forms, be named micramphi- 
discs. The part of the curve pertaining to these micramphidiscs is divided by 
the deep depression at about 63.2 into two parts, one comprising the larger, 
the other the smaller forms. Although the larger of these amphidiscs are very 
similar morphologically to the smaller, there could, after their biometrical 
study had pointed the way, be found certain morphological differences between 
them, particularly in the curvature of the anchor-teeth, which corroborate their 
biometrical distinction, and which, although slight, in my opinion justify a 
division of the micramphidiscs into two subgroups : — large micramphidiscs 
over 63.2 /x in length, and small micramphidiscs under that. 
