96 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



Potsdam sandstone (Theresa member) ; Greenfield, west of Sara- 

 toga Springs, New York. 



Holotype and paratypcs. — New York S. M.; casts, U.S.N.M. Nos. 

 io88i4a-c. 



ELVINIA GRANULATA, new species 



Plate 18, Figures ii, 12 



This cranidium, lying next to a good example of Berkeia affinis, is 

 the only one found. 



The large glabella tapers slightly to a rounded front. Only the rear 

 pair of furrows is developed. The eyes are situated well forward. At 

 the anterior end of the eyes the fixigenes are about one-third the 

 glabellar width. Posterolateral limbs large and long. The brim, 

 divided about equally between the preglabellar area and the thickened, 

 somewhat upturned rim, occupies about a fourth the cranidial length. 

 The surface is covered closely by evenly spaced and evenly sized 

 granules which in the preglabellar area overlie a system of vertical 

 anastomosing lines. 



Secret Canyon shale; (loc. 63) northeast of Adams Hill. Eureka 

 District, Nevada. 



Holotype.— v.. S.'NM. No. 108815. 



ELVINIA MISSOURIENSIS Resser 



Plate 18, Figures 13-17 



Elvinia roemeri Bridge (part), U. S. Geol. Surv. Prof. Pap. 186-M, p. 251, 



pi. 69, figs. 12, 13, 1937. 

 Elvinia missouriensis Resser, Smithsonian Misc. Coll., vol. 97, No. 10, p. 31, 



1938. 



A well-preserved cranidium, the pygidium, and the libragene are 

 figured to illustrate specific characteristics not shown in the holotype. 

 It will be observed that the doublure evidently extends completely 

 across the head. 



Davis formation; (loc. iik) Federal Lead Mine No. 4, Flat River, 

 Missouri. 



Holotype. — U.S.N.M. No. 9301 1; plesiotypes. No. 108819. 



ELVINIA GREGALIS, new species 

 Plate 18, Figures 18-23 



This is one of the smaller species of the genus but seems to be rather 

 widespread in the Wichita Mountains. 



The glabella tapers at a normal rate to a truncate front margin. A 

 shallow rear glabellar furrow is developed. The fixigenes average 



