STUDIES IN SPICULE FORMATION. 269 
Trext-FIc. 8. 
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The above figures K and L represent camera lucida drawings of 
portions of Leucosolenia diverticula, and show well the two 
arrangements of the triradiates—oscular (K) and non-oscular 
(L)—which the above hypothesis attempts to account for. M, 
which is not drawn from an actual preparation, though it truly 
represents the facts, shows the transition from the one mode of 
disposition to the other consequent on the form of an osculum, 
TrxtT-FIG, 9. 
