30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 97 



Elvinia rocmcri Walcott (part), Smithsonian Misc. Coll., vol. 75, no. 2, 

 p. 56, 1924; idem, no. 3, p. 88, 1925; Bridge (part), U. S. Geol. Surv. 

 Prof. Pap., 186-M, p. 251, pi. 67, figs. 2a, b, 3a, b; pi. 69, figs. 1-8, 10, 15, 

 1937- 



E. rocmcri is not a widespread species, but many other forms have 

 been mistakenly identified with it. Without Shumard's specimens it 

 is impossible to know which Texas species received the name E. 

 roetneri. Bridge studied Roemer's original material and commented 

 on the other species of the genus, but he failed to select a type for 

 E. rocmcri. Inasmuch as Shumard's types are lost and Shumard 

 specifically states that figure 2a of Roemer is the species he was de- 

 scribing, it is logical to choose that specimen as the lectotype. Bridge 

 went so far as to say that this specimen "is the nearest thing to a 

 type that exists." 



Upper Cambrian, Wilberns ; ^ mile east of Camp San Saba and 

 (loc. I4i) I mile west of Cherokee, in San Saba County; (loc. 70) 

 Morgans Creek, 8 miles northwest of Burnet, Texas. 



Lectotype and paraiypcs. — Univ. Bonn ; casts, U.S.N.M. no. 95485. 



Elvinia texana, n. sp. 



Elvinia rocmcri Bridge (part), in Sellards, Adkins, and Plummer, Texas 

 Univ. Bull. 2,^:^2, p. 323, pi. 2, figs. 17, 18, 1933; Bridge (part), U. S. 

 Geol. Surv. Prof. Pap. 186-M, p. 251, pi. 69, fig. 15, 1937. 



This form is about the same size as E. rocmcri but is relatively 

 longer. The width across the fixigenes immediately in front of the 

 eyes is less than in E. rocmcri, and the profile is less highly arched 

 in both directions. The glabella of E. texana is rather sharply trun- 

 cate in front, and the anterior facial sutures extend almost straight 

 forward. 



No pygidium has been definitely assigned to this cranidium. Sev- 

 eral are present in the collection, but only one is good enough to as- 

 sign to a species. By its size and other features this pygidium seems 

 to be more logically referred to a larger species. 



Upper Cambrian, Wilberns; (loc. (58) Packsaddle Mountain, 12 

 miles southeast of Llano, Texas. 



Holotypc.—V.S.^M. no. 93013. 



Elvinia shumardi, n. sp. 



Elvinia rocmcri Walcott (part), Smitlisonian Misc. Coll., vol. 75, no. 2, 

 p. 56, pi. II, fig. 3, 1924; idem, no. 3, p. 88, pi. 17, figs. 9-13, 1925; 

 Bridge (part), in Sellards, Adkins, and Plummer, Texas Univ. Bull. 

 3232, p. 323, pi. 2, fig. 19, 1933; Bridge (part), U. S. Geol. Surv. Prof. 

 Pap. 186-M, p. 251, pi. 69, figs. 9, 10, 1937. 



