CAMBRIAN FOSSILS FROM PIOCHE MOUNTAINS 295 



This form was not collected by the writer, although Walcott has 

 described it from this locality. 



BRACHIOPODA 



GENUS LINGULELLA, Salter 

 LiNGULELLA, Salter, 1861: Memoir, Geological Survey of Great Britain, 

 P- 333- 



Lingulella ella, H. & W. 



(Plate I, Figs. 2, 2a) 



Linguelepsis ella, Hall and Whitefield, 1877: Geological Exploration of the 

 Fortieth Parallel, Vol. IV, p. 232, Plate i. 



Lingulella -ella, Walcott, 1886: Bulletin No. ^o, U. S. Geological Survey, 

 p. 97, Plates 7, 8. 



Walcott has recently described this form under the name Oholus 

 (Westonia) ella. It is found in great abundance wherever the shale 

 member is available, and is probably the best-preserved of any of 

 the fossils. 



Location : Himon Mine, Chisholm Mine, Half Moon Mine, and 

 Abe Lincoln Mine. 



Lingulella genei, n. sp- 



(Plate I, Figs. 3, 3a, 36) 



Small shell, rarely exceeding 2™™ in length, elongate ovate or semielliptical ; 

 about one-fifth longer than broad; widest portion a little nearer the front which 

 is broadly rounded. Dorsal valve generally ovate and rounded at the beak. 

 Both valves moderately convex. 



The interior cast- of the dorsal valve is well marked by three scars, the 

 middle one of which extends more than half-way toward the front, the outer 

 ones not quite so far. 



In general this species resembles Lingulella granvillensis, found at 

 Whitehall, N. Y. It differs in the ovate form, in the surface mark- 

 ings, and in the muscular scars. 



This fossil occurs abundantly in the shales at the Half Moon 

 Gulch. It is associated with Zacanlhoides typicalis, Ptychoparia 

 j>oichensis, and Eocystites ? ? longidactylus. In fact, the writer has 

 one slab carrying these four fossils. It is preserved in beds of pink 

 and brown calcareous shale ; the fossil is of the same color as the 

 inclosing rock, but a httle darker. 



Location: Abe Lincoln Mine. 



