314 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



It differs, however, from the latter in many details of the cephalon and 

 thorax. The cephalon more closely resembles that of Holmia roivci ' 

 in its glabella and strong, rounded marginal border, but it does not 

 have the strong occipital spine of the latter. There are 13 segmenfs 

 of the thorax preserved in the type specimen. The ends of the plural 

 lobe terminate rather abruptly in sharp, backward-pointing spines, in 

 this respect resembling Holmia kjerulft. 



Nothing is known of the posterior segments of the thorax or the 

 pygidium. 



The type and only specimen of this species was discovered by 

 Professor H. Justin Roddy of the State Normal School, Millersville, 

 Pennsylvania, who presented it to the United States National 

 Museum. 



Formation and locality. — Lower Cambrian: (i2v) Upper portion 

 of York formation, 2 miles (3.2 km.) north of the citv of Lancaster, 

 near Fruitville, Lancaster County, Pennsylvania. 



WANNERIA OCCIDENS, new species 

 Plate S3, fig. 2 



Of this species only a single cephalon occurs in the collection. 

 This has the characteristic short palpebral lobe and elongate boss 

 between the latter and the dorsal furrow adjoining the glabella. The 

 sides of the glabella are subparallel opposite the two posterior pairs 

 of glabellar furrows. The margin of the cephalon is broad and slightly 

 rourided. A short occipital spine that is about one-fourth the length of 

 the cephalon projects backward from the center of the occipital ring. 



The cephalon differs from that of Jl'anneria zvalcottanus' in being 

 proportionally more elongate, and in the presence of an occipital spine 

 instead of an occipital node or tubercle. 



It differs from Olcnellus gilbcrti" in its small, short palpebral lobe 

 and strong marginal rim, also in the presence of an occipital spine. 



The small palpebral lobe and tubercle back of it suggest Olcnellus 

 canadensis* but the other parts of the cephalon differ. 



Formation and locality. — Lower Cambrian: (6ik) ]\Iahto forma- 

 tion ; dark, hard siliceous shale ; northeast base of Alumm Peak above 

 Mural Glacier on west side of Hitka Pass, 6 miles (9.6 km.) in a 



^ Smithsonian Alisc. Coll., Vol. 53, No. 6, igio, pi. 29. 



^ Idem, pi. 30. 



^ Idem. pi. 36. 



* Idem, pi. 38, figs. 4-6. 



