301 
HYALONEMA (PRIONEMA) FIMBRIATUM. 
In a 
Occasionally smaller micropentactines with straight rays are met. 
spicule of this kind the rays measured were 4 u thick at the base, the apical ray 
was 54 » long; the laterals were 34 u long. 
Of amphidiscs several kinds can be distinguished: — A, large ones, with 
medium anchors the teeth of which are smooth, and have straight or outwardly 
curved, diverging ends; B, large, medium-sized, and small ones with slender 
anchors, the teeth of which bear frill-like, fimbriate membranes on their margins 
and have inwardly curved, convergent ends; and C, small ones with broad 
anchors, the teeth of which appear smooth and have end-parts more or less 
parallel to the shaft. 
The frequency of the various lengths is repre- 
I measured 202 amphidiscs. 
sented in the following exponential graph (Fig. 15). 
Macramphidiscs 
Large 
Fimbriate. amphidiscs. 
Small 
SCS, 
' 
Micramphidi 
ee eee ee ee ee ee ee 
Number, 
30 
25 
20 
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Length of Amphid 
‘ig. 15.— Amphidiscs. 
