Survey of the Animal Kingdom 283 



qastra\ 

 cavit- 



qastra] 

 epitheliurn 



F/agellam 

 -CoUar 



;^Xhoariocyte 



Porocybe ^^^^ 



jpicule yAmoebocyte 



leroblast 

 derma] ^pifcheliam 



Fig. 84. — x\ cross section of part of a simple sponge (Leucosolenia sp.), showing 



the structures in detail. 



Fig. 85. — Twelve different species of sponges: A, Euplectella sp. (Venus's 

 flower basket, from the Philippine Islands) ; B, Suberites domuncula (from the 

 Mediterranean) ; C, Phyllospongia velum (paper sponge, from Africa) ; D, Pan- 

 daros sp. (finger sponge, from the West Indies) ; E, Euspongia officinalis (grass 

 sponge, from Nassau) ; F, Tuba plicifera (tube sponge, from the Bahamas) ; G, 

 Pachychalina rubens (purple sponge, from the Bahamas) ; H, Euspongia sp. (hard 

 head sponge, from Nassau) ; /, Hyalonema sieboldii (glass rope sponge, from 

 Japan) ; /, Hircina ignobilis (Hircina sponge, from Africa) ; K, Verongia sp. 

 (Verongia sponge, from the West Indies) ; L, commercial sheep's wool sponge 

 (from Nassau). 



