NO. 3 CAMBRIAN AND OZARKIAN TRILOBITES 10/ 



MOOSIA GRANDIS Walcott 



Plate 23, figs. 20, 21 



Moosia grandis Walcott, 1924, Smithsonian Misc. Coll., Vol. 75, No. 2, p. 59, 

 pi. 14, fig. 9- 



This species is founded on a few cranidia and one associated 

 pygidium. Free cheeks unknown. 



The illustrations and the generic description present the essential 

 characters of the species. 



Formation and locality. — Upper Cambrian : Goodsir formation. 

 Moose Creek, British Columbia. 



Genus MOXOMIA Walcott 



Moxomia Walcott, 1924, Smithsonian Misc. Coll.; Vol. 75, No. 2, p. 59. 



Glabella quadrate, two sets of glabellar furrows present, not joined 

 across the glabella. Dorsal furrow deep and glabella clearly marked 

 off all around. 



Eyes small, situated well forward. Palpebral lobes not elevated 

 as high as- the glabella. Fixed cheeks about one-quarter the width 

 of the glabella. A steep frontal border with a narrow rim present. 

 Just inside of rim a row of pits. Rim ornamented by a series of fine, 

 irregular lines running in a transverse direction. Facial suture 

 diverges only slightly in front of the eye and apparently intersects 

 the margin near the point where it joins the rim: i. e., intramarginal 

 for a short distance. Occipital furrow present. 



Genotype. — Crepicephahis (Bathyurusf) angulatus Hall and 

 Whitfield. 



Range. — Ozarkian : Eureka District, Nevada ; Robson Peak Dis- 

 trict, British Columbia. 



MOXOMIA ANGULATA (Hall and Whitfield) 



Plate 22, figs. 8, 9 



Crepicephalus (Bathyurus ?) angitlatus Hall and Whitfield, 1877, U. S. 



Geol. Expl. 40th Paral., Vol. 4, p. 220, pi. 2, fig. 28. 

 Ptychoparia ? angulatus Walcott, 1884, Monogr. U. S. Geol. Surv., 8, p. 



269 (Generic Reference). 

 Ptyclwtiaria (EmmricJtclla) angulatus Walcott, 1916, Smithsonian Misc. 



Coll., Vol. 64, p. 204 (Generic Reference). 

 Moxomia hecuba Walcott, 1924, ,Smithsonian Misc. Coll., Vol. 75, No. 2, p. 59, 



pi. 12, fig. 3. 



The generic description indicates all the known characters of this 

 species. 



4 



