NO. 5 CAMBRIAN TRILOBITES 375 



posed to be the equivalent of ib oi the Orr Ridge section above the 

 granite contact on top of the ridge north of Notch Peak, both in 

 House Range, Millard County, Utah. 



Family Asaph id.e Burmeister 

 Subfamily Ogygiocarin^ Raymond 

 . Ogygiocarinae Raymond, 1913, Zittel-Eastman's Paleontology, p. 718. 



Opisthoparia with large subequal cephalon and pygidium, promi- 

 nent eyes, palpebral (ocular) ridge crossing free cheeks, thorax with 

 7 to 1 1 segments. 



Hypostoma rounded. Middle Cambrian to Ordovician. 



Dr. Raymond has included Megalaspis and other genera of a 

 similar character under Ogygiocarinse, but with our present informa- 

 tion I am inclined to include only Ogygiocaris Angelin, Ogygopsis 

 Walcott, Orria Walcott, Asaphiscus Meek, and Bloimtia and Mary- 

 villia are provisionally referred to the subfamily. 



Genus OGYGOPSIS Walcott 



Ogygopsis Walcott, 1888, Proc. U. S. Nat. Mus., Vol. 11, p. 446. (Names 



Ogygia klotzi Rominger as genotype of genus.) 

 Ogygopsis Miller, 1892, North American Geol. and Pal., First Appendix to 



1889 Ed., p. 710. (Brief note on genus.) 

 Ogygopsis Grabau and Shimer, 1910, North American Index Fos., Vol. 2, 



p. 289. (Brief description of genus.) 

 Ogygopsis Raymond, 1912, Trans. Roy. Soc. Canada, 3d ser.. Vol. 5, Sec. 4, 



p. 116. (Discusses development and relationship of genus.) 



Dorsal shield elongate-elliptical in outline ; axial lobe distinct ; 

 pleural lobes broad. Cephalon shorter and broader than the pygidium, 

 semicircular in outline with genal angles produced into short spines. 

 The facial sutures cut the posterior border just within the genal angles 

 and extend inward and forward with a slight sigmoid curve to the 

 base of the eye; arching over the eye lobes they curve gently out- 

 ward and then inward to the frontal border, which they cut across 

 obliquely inward ; the outer border is rather narrow in front of the 

 glabella and of mediimi width on the free cheeks; the posterior 

 border is narrow and separated by a strong furrow from the body 

 of the fixed cheeks. 



Cranidium with a large glabella; large free cheeks and strong 

 postero-lateral limbs ; glabella nearly as long as the cranidiuni, slightly 

 widened towards the front : moderately convex and marked by a 



