336 Systematic Paleontology — Middle Devonian 



posterodorsal region. Dorsal edge scarceh'^ straight, gently curving into 

 the ends. Ventral overlap distinct. Surface smooth and even, without 

 eye tubercle or muscle spot. The development of a flange at the dorsal 

 border is a very unusual feature in this genus. L. sinuata Hall has 

 nearly the same shape, but is without a flange, and so far as known its 

 valves do not overlap at the ventral margin. I am inclined to believe that 

 species of this character ought to be arranged with Aparchites rather than 

 Leperditia. Position and locality : Devonian Bryozoa bed. Palls of the 

 Ohio. Pare." Ulrich, 1891. 



A circular or subcircular ostracode occurs sparingly as casts of the shell 

 at three or four localities represented by the collections. These agree with 

 Ulrich's figures of L. subrotunda, except that the projecting flattened 

 border feature appears to be developed but slightly or not at all; the 

 form here compared with L. subrotunda may represent a closely related 

 species. 



Occurrence. — Eomney Formation, Onondaga Member. One and 

 three-quarter miles south of Berkeley Springs, West Virginia. 



Collection. — -U. S. National Museum. 



Family BEYRICHIIDAE 



Genus BOLLIA Jones and Holl 



BoLLiA ungula Jones 

 Plate XLIV, Figs. 7, 8 



Bollia ungula Jones, 1889, American Geologist, vol. iv, pp. 338-339, pi. opp. 



p. 242, figs. 10-13. 

 Bollia ungula Kindle, 1912, Bull. U. S. Geol. Surv., No. 508, p. 113, pi. ix, figs. 



9, 10. 



Description. — " Prof. Claypole's specimens are well preserved casts in 

 buff-colored, non-calcareous shales from the Marcellus limestone of Perry 

 County, Pennsylvania (near Xew Bloomfield). There are several, and 

 they vaiy from 1 to 21^ mm. in length. The proportions of some of the 

 best are given in the figui-es 10-13, magnified 15 diameters. In some 



