22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I28 



Occurrence. — The species is known only from the type locahty 

 (U.S.N.M. locality 6id; author's locality P22m) : St. Piran sand- 

 stone (Peyto limestone member), about no feet above base of mem- 

 ber; on west ridge of Mount Schaffer, 0.4 miles W. 30° S. of the 

 summit ; Yoho National Park, British Columbia. Associated with 

 olenellids, Bonnia fieldensis (Walcott) and Zacanthopsis. 



Types. — Holotype and paratypes: U.S.N.M. No. 64387. Plesio- 

 type: U.S.N.M. No. 123876. 



LUXELLA CRASSIMARGINATA Rasetti, new species 

 Plate 6, figures 7, 8 



Available material. — Two cranidia, one of which is poorly 

 preserved. 



Description. — Glabella tapered in the posterior three-fifths, paral- 

 lel-sided in the anterior two-fifths, hence with concave side outline ; 

 sloping down to a low anterior end but still well delimited in front. 

 Four pairs of very short and shallow glabellar furrows visible ; occip- 

 ital furrow deep; occipital ring rather long (sag.), bearing a node. 

 Preglabellar field one-third as long (sag.) as the border medially; 

 border upsloping, slightly convex, very long (sag.) at the midline, 

 tapering at the sides ; marginal furrow not greatly curved, with barely 

 a trace of a median inbend. Palpebral area horizontal, flat, fully as 

 wide as the glabella ; palpebral lobes not preserved, but evidently long ; 

 posterior limbs not entirely preserved. Surface of test punctate. 

 Length of cranidium 7 mm. 



Remarks. — This distinctive species appears, worth naming although 

 represented by imperfect material. It differs from L. lux chiefly in 

 the different proportions of the preglabellar field and border, concave 

 lateral outline, and better definition of the glabella. 



Occurrence. — Boulder B-6, Bic. 



Ty/'^.f.— Holotype : U.S.N.M. No. 123885. Paratype: U.S.N.M. 

 No. 123886. 



Genus AUSTINVILLIA Resser, 1938 



Description — Glabella tapered, straight-sided, not greatly elevated, 

 moderately rounded in front, faintly furrowed at the sides. Occipital 

 ring short (sag.). Dorsal furrow not very deep. Frontal area of 

 average length (sag.), faintly arched transversely, divided by a faint 

 marginal furrow into a short (sag.) preglabellar field and a long 

 (sag.), convex border. Palpebral area slightly convex, horizontal; 

 ocular ridges of average strength; palpebral lobes narrow, elevated. 



