1905.] SPONGE CLATHRINA CONTORTA. 7 
Text-fig. 2. 
1) , ie 
/ 
Spicules of a specimen of Clathrina contorta from Roscoff. 
Figg. 1a, triradiate; 1 6-1 e, quadriradiates in facial aspect; 1, abnormal quadri- 
radiate with one basal ray wanting; lg-17, quadrivadiates in side view, 
showing gastral rays in profile; 1j-1m, monaxons (the spicule represented 
by 1, being too long for the page, has been drawn in two pieces). 
