66 THE CRAG POLYZOA. 



The form represented in our figure is referred with some little doubt to E. incisa 

 of M. Edwards, and chiefly from the shape of the orifice. The only other fossil species 

 having an orifice of the same or nearly similar form, are E. sinuosa, nob., and E. monilifera, 

 M. E. The distinctions between the latter and E. incisa are too obvious to require 

 remark. Those between E. incisa and E. sinuosa consist : 1. In the peculiar habit of the 

 polyzoary in the latter, and its far greater thickness. 2. In the large size of the orifice 

 of the cells, and its being always surrounded by large well-marked pores, with which the 

 rest of the surface is also closely beset. 



3. E. POROSA, M. Edw, PI. XI, fig. 4. 



Polyzoario valde flexuoso, contorto, cavernoso. Cellulis ovalibus vel pyriformibus, 

 presertim ad rnarginern punctatis. Ostio angustato, transversali, supra rotundato, labio 

 inferiori recto, subinde mucronato. Ovicellulis immersis puuctatis. 



Polyzoarium much contorted, cavernous ; cells oval or pyriform ; surface punctured 

 especially around the border ; orifice rounded above, narrow and elongated from side to 

 side, with a straight or slightly mucronate lower lip ; ovicells immersed, punctured. 



E. POROSA, M. Edwards, 1. c., p. 13, pi. xi, fig. 7; S. Wood, 1. c., p. 17. 



Habitat. C. Crag, S. W. ; Subapennine, M. Edwards. 



This species is referred with some doubt to M. Edwards's E. porosa, but upon considera- 

 tion of the general characters exhibited in his figures and description, there appears to be 

 good reason for believing that the Subapennine and Crag fossils will be found identical. 



1. E. SINUOSA, (n. sp.}. PI. X, fig. 6. 



Polyzoario pedunculate, e lobis distinctis, sinuosis composito ; cellulis irnmersis, super- 

 ficie presertim circa ostium punctata ; ostio suborbiculari, labio inferiori inciso, subinde 

 tantum perforate. 



Polyzoarium disposed in sinuous distinct folds, arising from a contracted peduncle 

 which is attached by an expanded base ; cells wholly immersed ; orifice suborbicular with 

 a narrow sinus below, and sometimes a small opening instead of the sinus; surface 

 punctured around the orifice and usually in the interspaces also. 



Habitat. C. Crag, S. W. 



The peculiar habit of growth in this species renders its diagnosis, when tolerably 

 perfect, very easy. Small fragments, however, could not be so readily distinguished from 

 overgrown specimens of other species, as for instance in the very old condition of the 



