68 SMITHSONIAN M ISCEI.l.ANEOUS COLLECTIONS VOL. 1 03 



The glabella tapers slightly to a rounded front. At the eye the 

 fixigenes are exactly half the glabellar width. The facial suture forms 

 rather broad posterolateral limbs. Eyes small and strongly bowed. 

 Brim concave, with a rim differentiated liy a change in slope. Eye 

 lines traceable on exfoliated specimens. 



Pygidium convex, sloping down rather sharply at the anterior 

 angles. Outer lest smooth, and dorsal furrow shallow. On exfoliated 

 specimens both the pleural furrows and grooves are visible. 



Pilgrim formation; Dead Indian Creek; and (loc. I5ig) mouth of 

 Clark Fork River, Absaroka Range, Wyoming; (loc. 4r) Suce Creek. 

 Mount Delano, Snowy Range ; and near Moss Agate Springs, Castle 

 Mountains (with type of Trier e pic ephahis tripunctatits) , Montana. 



Holotype.—V.S.'NM. No. 94343 ; plesiotypes, Nos. 108756, 108757. 

 108772. 



MARYVILLIA VIOLAENSIS, new species 

 Plate 12, Figures 21-26 



About a dozen cranidia and half as many pygidia have been located 

 in the collections. Only two small cranidia are illustrated, as all the 

 larger specimens are incomplete. 



Two partially preserved cranidia show that the cranidiuni of the 

 species attained a length of about 15 mm. and a width of about 25 mm. 

 The glabella is poorly defined because the dorsal furrow is very 

 shallow. Eyes, eye lines, and fixigenes are average in development. 

 The brim on the other hand is excessively concave, and consequently 

 the rim seems to be more distinct than usual. As a whole the cranid- 

 ium is gently convex in a transverse direction and much more sharply 

 convex longitudinally. 



In the pygidium the axis is clearly outlined by a shallow dorsal 

 furrow. Axial rings and the anterior pleural furrows are faintly 

 indicated. The pleural lobes, nearly flat in their inner half, become 

 convex in their outer portion. Longitudinally the pygidium slopes 

 gently rearward. 



Maurice formation; (loc. 151k) Lebarge Creek, near Viola, Uinta 

 County, Wyoming. 



IloIotypc.—V.S.X.^]. Xo. 108758a; paratype, No. 108758!). 



MARYVILLIA UTAHENSIS, new species 

 Plate 12, Figures 27-32 



Oolitic and soft granular limestone beds of the Weeks formation 

 have yielded species of MarwiUia. M . iilahciisis is represented by 



