18 PERMIAN FOSSILS. 
Order ENALLOSTEGIA, D’Orbigny. 
Genus Zextularia, Defrance. 
Generic characters.—Shell 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. TextuLartiaA Triticum, xob. Tab. VI, fig. 5. 
Length, ai. 
Thickness, =45 
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, 06. Tab. VI, fig. 6. 
INCH. 
1 
Length, <4 
Thickness, +45 
Shell wedge-shaped, having four equal sides; composed of fourteen to sixteen 
flattened cells. Sutwres 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 Sperdlina, 
Khrenb. 
The specimen is a horizontal section, 3,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. 
