PORIFERA [sponges]. 



27 



" floricome " spicule, is characteristic of Euplectellid Sponges (Fig. 6c). High Case 

 The peculiar circular holes in the wall of the sponge allow of direct -'^l^- 

 communication between the outside and the interior. The large 2 a, b. 



Fig. 7. 



Spicules of Glass Sponges (magnified). In the centre a node of the Dlctyouine network of a 



Ventriculite Sponge. 



gastral cavity is closed at the summit by a sieve-plate. E. aspergiUum 

 is obtained from a depth of DO fathoms oflF Cebu, Philippines. The 

 magnificent Euplectella imperiaUs (Fig. 5 ; and specimens in 



