HYALONEMA (PHIALONEMA) PATERIFERUM. 
375 
respectively, m, The average proportion of the anchor-length to the anchor- 
breadth of the large micramphidiscs is in form C 100 to 92, in the forms D, E, 
and F 100 to 72-76. According to Wilson ( loc . cit.), the length of the anchors 
of these spicules is, both in forms A and B, a third of the length of the whole 
amphidisc; the anchors of these spicules are in these two forms therefore 
probably also about equal in respect to the proportion between length and 
breadth, n, In forms A and B the length (20-25 /j.) of the small micramphidiscs is 
equal. In forms C and I) these spicules are larger, most frequently about 26 and 
24 n long respectively. In forms E and F they are smaller, most frequently 
about 20 and 21 fi long respectively, o, The average proportion of anchor- 
length to anchor-breadth of the small micramphidiscs is in form D 100 to 153, 
in form C and F 100 to 140, and in form E 100 to 1 14. In the forms A and B this 
proportion is not known. 
The affinities of the six different forms in respect to these further qualities 
are tabulated below: — 
According to this table the units of all the fifteen possible pairs of forms, 
with the exception of those of two, coincide with respect to only 1-4 of the 
