118 THE CRAG POLYZOA. 



portion of the tubes is free, and the surface imperforate. The only other recent pedunculate 

 Defrancia with which I am acquainted, and which so closely resembles Cerioporu stellata 

 of Goldfuss that I have designated it by the same specific appellation, occurs in the same 

 locality as D. truncata, but no mistake can arise with respect to it. 

 The most nearly allied fossil forms are : 



1. DEFRANCIA MICHELINII, Hag. = CERIOPORA DIADEMA, Gold/., from the Cretaceous 



beds of Maastricht. 



2. D. BRONGNIARTII, M. Edwards (sp.), also a Cretaceous fossil. 



But the differences between these and D. striatula are so obvious as not to require 

 any special remark. 



(3. Sessile. 2. Interspaces cancellous. 

 D. RUGOSA, (. sp. ?) PI. XIX, fig. 3. 



Disciformis, adnata ; superficie cancellata ; cellulis magnis, paucis, valde elevatis. 



Discoid, adnate ; surface coarsely cancellated ; tubes large, few much elevated. 



Habitat. C. Crag, 8. Wood. 



It is difficult to assign any well-marked characters to this species, of which the 

 specimens are too imperfect for complete description, and it may consequently be found 

 to correspond with some already recorded form. 



Fam. V. CERIOPORID^:, Busk. 



Polyzoario solido sen lamelloso ; erecto seu decumbente, simplici vel ramoso. 

 Cellulis contiguis, confertis. 



Polyzoarium, solid or lamellar ; erect or decumbent (sometimes encrusting ?) ; simple 

 or branched. Cells contiguous, crowded. 



Genus 11. FUNGELLA, Hagenow. 



Polyzoario stipitato, capitato ; capitulo simplici vel lobato. Cellulis coalitis, omnibus 

 sursum spectantibus. 



