3IO SMITHSONIAN MISCELI-ANEOUS COLLECTIONS VOL. 53 



also the development of the side lobes of the three posterior glabellar 

 lobes. The tendency to segmentation of the cranidium is the same 

 as that shown by the head of EUiptoccphala asaphoidcs [pi. 25, figs. 

 9 and 10]. 



Comparisons. — Pccdeuiiiias transitans is represented both at York 

 and in Alabama by a number of cephalons that suggest the cephalon 

 of Olenelhis gilberti. as found in the shales in Nevada [pi. 36, figs. 

 1-3] ; also the cephalon of young specimens of Elliptocephala asaphoi- 

 dcs [pi. 25, figs. 11-13]. They dift"er from E. asapJwidcs in having 

 a larger, longer eye lobe, narrower glabella, and in the decided differ- 

 ence in the younger stages of growth. The cephalon of the adult 

 of 0. i^ilbcrfi [pi. 36, figs. 1-7] is very similar, but in the younger 

 stages of growth [pi. 36, figs. 11-14I they differ materially from P. 

 traiisifaiis [pi. 25. figs. 19-22; pi. 32. figs. 1-8]. 



Formation and Locality. — Upper portion of the Lower Cam- 

 brian : (25) dark siliceous shale at Parkers quarry, near Georgia, 

 Franklin County, Vermont. 



In the collections of the Geological Survey of Canada are speci- 

 mens of this species from Bonne Bay, Newfoundland : and from 

 L'Anse au Loup, on the northern shore of the Straits of Belle Isle. 

 Labrador. 



(8q) calcareo-argillaceous and arenaceous shales 2 miles (3.2 km.) 

 northwest of the city of York; and (48a) at Cutkamps quarry north 

 of Cottage Hill, north and northeast of the city of Troy, and east- 

 ward on the strike of the shales across York County to the Susque- 

 hanna River ; all in York County, Pennsylvania. 



( 56I and i2w) 2 miles (3.2 km.) north of the city of Lancaster, 

 Pennsylvania, near Fruitville, and westward at various localities to 

 the Susquehanna River, notably i mile (1.6 km.) north of Rohrers- 

 town on the farm of Noah L. Getz. 



(46) upper part of Rome sandstone. 5.5 miles (8.8 km.) west of 

 Cleveland, Tennessee. 



In central Alabama numerous specimens of the cephalon have been 

 found in the argillaceo-arenaceous Montevallo shales at the following 

 localities; (17a) 1.5 miles (2.4 km.) west of Helena on the Elyton 

 road; (i4id) >2 mile (.8km.) north of Helena; (164a) 2 miles 

 (3.2km.) north of Helena; (56c) about 1,000 feet (305m.) north- 

 east of Helena on roadside just north of Buck Creek; and (164c) 

 4 miles (6.4 km.) south of Helena; all in Shelby County, Alabama. 



