232 PALEONTOLOGY. 



FOSSILS OF THE LOWEE SILURIAN. 

 BllACHIOPODA. 



Geuus LINGULEPIS Hall. 

 LiNGULEPis Ella n. sp. 



Plate I, fiff. 8. 



Shell below the medium size. Dorsal valve subcircular or oblate, the 

 width slightly exceeding the length ; the beak perceptibly projecting beyond 

 the general contour of the shell, but very obtuse and slightly truncate; 

 sides and base rounded, the latter more broadly curved. Surface of the 

 valve depressed-convex, a little the most prominent on the umbone; marked 

 by fine irregular concentric lines of growth on the upper part, becoming 

 more strongly marked and finally quite lamellose toward the margin of the 

 valve. A few very indistinct, radiating lines may be seen near the beak 

 by the aid of a strong magnifier. Ventral valve unknown. Shell-sub- 

 stance phosphatic. 



There may be some doubt as to the true relations of this shell. The 

 broadly oblate form would be an objection to considering it as a true 

 Luiffula, while the truncation of the beak of the dorsal valve would accord 

 more nearly with what is known of some forms of Lingulepis. It is possible 

 it may prove to be a Lingtdella, but, in the absence of the ventral valve, it 

 cannot be satisfactorily determined. It differs from most known species 

 very perceptibly in the oblate form of the valve. 



Formation and locality. — In greenish argillaceous shales of the age of 

 the Quebec group, in the canon above Call's Fort, north of Box Elder 

 Canon, Wahsatch Range, Utah. Collected by S. F. Emmons, esq. 



Genus ORTHIS Dalman. 

 Orthis Pogonipensis n. sp. 



Pliit.) I, figH. 9-10. 



Shell quite small, seldom exceeding a third of an inch in width, and 

 usually much less; paraboloid in form below the hinge-line, but somewhat 



