NO. lO CAMBRIAN FOSSILS, 4TH CONTRIBUTION RESSER 3I 



This is a large species, attaining an average size about twice that 

 of E. roemeri. The anterior suture diverges more than E. texana, 

 although the relative width immediately in front of the eyes is about 

 the same. E. shumardi is decidedly flat in lateral profile. Longitudi- 

 nally the species has a highly arched profile, but without being greatly 

 curved. The neck furrow is discontinuous, a distinctive feature of 

 the species. 



It should be added that Walcott selected this species to represent 

 Shumard's E. rocmcri. This selection cannot stand because Roemer's 

 figure 2a was specifically mentioned by Shumard. 



Upper Cambrian, W'ilberns ; (loc. 70) Morgans Creek, about 8 

 miles northwest of Burnet; and (loc. 68) Packsaddle Mountain, 12 

 miles southeast of Llano, Texas. 



Holotypc. — U.S.N.M. no. 70259; paratypes, no. 70260, i. 



Elvinia bridgei, n. sp. 



Elvinia rocmcri Bridge (part), U. S. Geo!. Surv. Prof. Pap. 186-M, p. 251, 

 pi. 69, figs. 19-21, 1937. 



L^nfortunately only an incomplete cranidium of this species was 

 illustrated. Although none of the numerous cranidia in the collection 

 are complete, many are more so than the specimen illustrated. How- 

 ever, this cranidium shows sufficient of the width of the head and 

 the depth of the furrows to characterize the species. The occipital 

 furrow is deeper and wider than shown. The eyes are in a position 

 about parallel to the course of the dorsal furrow. The preglabellar 

 area is bulged so that the rather straight anterior furrow is deep, 

 and is marked by irregular longitudinal ridges. The rim is rather 

 wide and swollen, separated by a deep anterior furrow. This species 

 is much more highly arched longitudinally than laterally. 



The associated pygidium is of normal type, and has the rim turned 

 up rather sharply. 



There are several other species of Elvinia in the Oklahoma collec- 

 tions, but, since they require illustration, are not included in this 

 paper. 



Upper Cambrian, Honey Creek; (loc. Sgv) NE. ^ Sec. 9, T. i S., 

 R. I W., 4 miles southeast of Hennepin, Arbuckle Mountains, 

 Oklahoma. 



Cotypes. — U.S.N.AL no. 93025. 



Elvinia missouriensis, n. sp. 



Eh'inia rocmcri Bridge (part), U. S. Geol. Surv. Prof. Pap. 186-M, p. 2511, 

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



