20 THE CRAG POLYZOA. 



Habitat. — C. Crag, 8. W. {Recent) ; Britain, ubique. 



A single, small, and very imperfect fragment of a Scrupocellaria occurs in Mr. S. 

 Wood's collection, whose condition renders it almost impossible to be certain of more than 

 the generic character. The aspect of the specimen, however, when compared with that of 

 broken fragments of S. scruposa, is sufficient to justify its provisional reference to that 

 species, which it resembles perhaps more closely than it does either of the four species 

 of Bactridium, noticed by Reuss, in the Vienna Tertiary Basin. 



Eam. II. SALICOBNABIIBj^, Busk. 



Cells disposed quincuncially around an imaginary axis ; forming the cylindrical inter- 

 nodes of a dichotomously divided, erect, phytoid polyzoarium. 



Genus 1. Salicornaria, Cuvier. 



Polyzoarii superficie in areis angulatis divisa ; aviculariis immersis, irregulariter inter 

 cellulas sparsis. OviceUulis occultis, poro arese summitate posito. 



Surface of polyzoarium subdivided by ridges into more or less uniform, angular arece ; 

 immersed avicularia dispersed irregularly among the cells. Ovicells concealed, opening 

 at the summit of the area. 



Salicornaria, Cuvier, R. An., 1817; Johnston; Bush ; Auct. 

 Salicornia, Schweigger. 



Cellul ARIA (pars), PaWa« y Bruguihre ; Ellis and Solander. 

 Cellaria (pars), Lamouroux ; Lamarck ; Blainville ; Bosc ; Reuss. 



— Hagenow ; If Orhigny (including Cellarina) ; S. Wood; J. Morris. 

 ViNCULARiA, Bronn. 



— (pars), Bef ranee et Auct. 



Glauconoma (pars), Gold/uss. 

 EscHARA (sp.), Linn.; D' Orbigny. 

 EscHARiNELLA (sp.), B'OrMgny. 

 Farcimia, Fleming ; Couch. 

 TuBULARiA (sp.), Linn. ; Olivi. 

 Isis (sp.), Fabricius. 

 Flustra (sp.), Linn. 



The distinction between Vincularia, Defrance, and Salicornaria, is sufficiently marked 

 by the character that in the latter genus the polyzoarium is subdivided into distinct inter- 



