Classification. 53 



Subfamily III. 



Calathosponoiin^. 



Expanding forms with smooth, tufted or nodose surface and obtuse basal 

 extremity withoiit diaphragm or periloph. 



Calathospongia, Clepsydrospongia, 



Thamnodictya, Cleodictya. 



The genus Clepsydeospongia presents, in its tufted nodose surface, 

 the aspect of Hydnoceuas, but is as broad at the basal, as at the apertural 

 extremity. 



Cleodictya is tentatively placed in this division on account of its appar- 

 ently broad base. 



Subfamily IV. 

 Physospongiin^. 



Stout cups with a single or double series of strong horizontal and vertical 

 spicular bundles, tufted at their intersections ; meshes covered by thin bul- 

 late expansions or depressions of the reticulum (parenchymalia) ; no Ijasal 

 disk (?). 



Physospongia, Roemerispongia. 



Subfamily V. 



HYPIIANT^ENIINiE. 



Large saucer-shaped fronds composed of a single series of ligidate con- 

 centric and radial reticulating bands ; meshes partially closed by parenchymal 

 reticulum; attached by basal apex (basalia?). 



Hyphantsenia. 



Subfamily VI. 



Hallodictyin^. 



Irregularly growing, explanate or frondiform sponges, with smooth or 



tufted nodate surface. 



Hallodictya, Cryptodictya. 



Actinodictya, 



Subfamily VII. 



AOLII'HODICTYIN^. 



Discoid sponges, rapidly expanding and contracting ; attached by apex 

 (basalia ?) ; osculum large. 



Aglithodictya. 



