1905.] 



SPONGE CLATHRINA OONTORTA, 



Text-fig. 2. 



Spicules of a specimen of Clathrina contorta from Roscoff. 

 Pio-o-. la, triradiate; 1 6-1 e, quadriradiates in facial aspect ; 1/, abnormal quadri- 

 radiate with one basal ray wanting; Ig-li, quadrn-adiates m side view 

 showing gastral rays in profile; Ij-lm, monaxons (the spicule represented 

 by Im, being too long for the page, has been drawn m two pieces). 



