Plate IV. 



ClLCLunoplectella cavernosa Ij. Pp. 53-71. 



Fig. ]. Portion of tlie wall of a large individual ^ nat. sizr. AU the 



figures in tliis plate taken from this specialen (Soi. Coll. Mus. Sp. 



No. 443). 

 Fig. 2. öigmatocoine. 300 x . Same as fig. 11 of the following Plate. 

 Fig. 3. Two terminals from the same. About 1000 x. 

 Fig. 4. Section of the wall. About nat. size. Above, the dermal surface. 



Arrows show the direction of water current. 

 Fig. 5. Portions of spicules in the periphery, a, I), pentactinic and tniiactinic 



dermalia. c, d, two unequally rayed parenchymalia. About .50 x . 

 Fig. 6. Parenchymal hexactins of different sizes (a, b, c). About bO x. 

 Fig. 7. Dermal layer seen from outside, with soft dermal reticulum. .50 x . 

 Fig. 8. Oxyhexactinic canalaria, witli a sigmatocome (fig. 2) at tiie end 



of the freely projecting ray. 100 x . See fig. 12 of the following 



Plate. 

 Fig. 9. Lariie discohexaster with anchorate terminal umbels. 300 x . 



