28 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 95 



SYSPACEPHALUS, n. gen. 



Diagnosis. — Small trilobites of which the cranidium alone is known. 

 Glabella narrow, tapering slightly ; truncated, about two-thirds as long 

 as cranidium ; in some species ill defined on upper surface of test. 

 Glabellar furrows showing on inner side of test. Brim convex with 

 faint frontal furrows extending inward from the anterior angles for 

 varying distances. Facial suture converging anterior to eyes. Eyes 

 small. Occipital furrow developed on the cheeks, but sometimes al- 

 most obsolete on the cranidium. 



Genotype. — Agraulos charops Walcott. 



Range. — Late Lower Cambrian. Upper Mount Whyte and forma- 

 tions of a similar age. 



Name. — oraTraw = contracted ; /cei/faAo? = head. 



Syspacephalus charops (Walcott) 



Agraulops champs Walcott, Smithsonian Misc. Coll., vol. 67, no. 3, p. 72, 

 pi. 13, fig. 2, 1917. 



Lower Cambrian, Mount Whyte; (loc. 35f) Mount Stephen, near 

 Field, British Columbia. 



Holotype.—\5.S.l<^.'M.. no. 64395. 



Syspacephalus unca (Walcott) 



Agraulos? unca Walcott, Smithsonian Misc. Coll., vol. 67, no. 3, p. 7-^, pi. 13, 

 fig. I, 1917. 



Lower Cambrian, Mount Whyte; (loc. 6id) Mount Shaffer and 

 (loc. 35h) Mount Bosworth, British Columbia. 

 Holotype.—U.S.^.M. no. 64394 . 



Syspacephalus? redpathi (Walcott) 



Agraulos redpathi Walcott, loth Ann. Rep. U. S. Geol. Surv., p. 654, fig. 69, 

 1 891. 



Lower Cambrian; Mount Simon, Quebec. 



Cotypes. — U.S.N.M. no. 23839; Peter Redpath Mus., McGill Uni- 

 versity, Montreal. 



OLIGOMETOPUS, n. gen. 



Diagnosis. — Cranidium only part known. Broad, with wide gla- 

 bella and fixed cheeks. Glabella wide, rounded in front, apparently 

 with a faint rear pair of joined glabellar furrows. Eyes slightly be- 

 hind middle of head ; eye lines developed. Brim consists of narrow 

 rim only. 



