BARBATIA. 43 



Measurements : 



Length ......... 33 mm. 



Height 19 „ 



Remarks. — There are two internal casts of left valves from Cuckhamsley in 

 the Montagu Smith Collection, Woodwarclian Museum, which, in general form, 

 agree with A. Galliennei, d'Orbigny, except that they are proportionately shorter. 

 Distribution. — Chalk Rock (zone of Heteroceras Reussianum) of Cuckhamsley. 



Barbatia ? sp. Plate VII, figs. 13 a, b. 



1897. Ahca, sp., H. Woods. Quart. Journ. Geol. Soe, vol. liii, p. 379, pi. xxvii, 

 fig. 1. 



Description. — Shell elongate, oblique, very inequilateral. Anterior margin 

 forming an angle with the hinge-line, and curving ventrally to join the ventral 

 margin, which is nearly straight, but has a considerable slope posteriorly. 

 Posterior margin oblique, somewhat rounded. Umbones apparently sharp, 

 pointing anteriorly; shell compressed dorsal to a line between the umbo and the 

 postero-ventral extremity. Surface with well-marked lines of growth ; radial 

 ribs extend from the umbo posteriorly, and perhaps occur also on other parts of 

 the shell. 



Measurements : 



Length . .13 mm. 



Height 6 „ 



Remarks.— This form is at present known by one specimen ouly, an internal 

 cast, but showing indications of ornament. It resembles Area strehlensis, Geinitz, 1 

 from the Planer-Kalk of Strehlen (Dresden), but in that species the shell is less 

 oblique, and the surface is generally smooth except on the anterior part, which 

 is marked with radial ribs. 



Distribution. — Chalk Rock (zone of Heteroceras Reussianum) of Cuckhamsley. 



1 " Daa Elbthalgeb. in Sachsen " (' Pala?ontographica,' vol. xx), pt. 2, 1873, p. 56, pi. xvi, fig. 5. 



