18 PERMIAN FOSSILS. 



Order Enallostegia, D'Orbigny. 

 Genus Textularia, Defrance. 



Generic characters. — Bliell conical or wedge-shaped, equilateral, formed of cells 

 arranged (like a band of hair) alternately, on the same plane and on two distinct 

 parallel axes. Aperture semilunar, on the inner side of the last cell. 



No. 1. Textularta Triticum, noh. Tab. VI, fig. 5. 



INCH. 



Length, ^i^ 

 Thickness, -^-^ 



Shell conical, somewhat flattened on two of its sides ; its horizontal section oval ; 

 composed of nine subglobose cells. Sutures deeply sulcated. 

 This species is found at Byers' Quarry ; rare. 



No. 2. Textularia cuneiformis, nob. Tab. VI, fig. 6. 



INCH. 



Length, /^ 

 Thickness, -,-ij 



Shell wedge-shaped, having four equal sides ; composed of fourteen to sixteen 

 flattened cells. Sutures shallow. 



We have seen three or four specimens of this species from Byers' Quarry. A very 

 similar form occurs in the Gault of Folkstone. 



Genus Spirillina, Ehrenberg. 



Gen. char. — Microscopic shell, spiral, orbicular, porous, hyaline, smooth. (Ehrenb.) 



After the execution of the plates, Mr. King found in the Shell-limestone at 

 Tunstall Hill a specimen of a spiral shell, apparently identical with Spirillina, 

 Ehrenb. 



The specimen is a horizontal section, -l inch diameter, having six volutions, and 

 without any traces of septa. 



The alliances of this little Serpula-like shell are at present uncertain. Professor 

 Ehrenberg and Mr. Williamson have noticed similar shells in the recent state, and 

 Mr. Strickland a species from the Lias. 



