246 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



Dimensions. — The only specimen known to me of this species has 

 a length of i8 mm. The relative proportions of the various parts 

 have probably been fairly well retained in fig. i, although the 

 cephalon and thorax have been shortened and widened by longi- 

 tudinal compression and flattening in the shale. 



Observations. — This fine species was found by Professor H. Justin 

 Roddy at the Fruitvale stone quarry in a dark gray silico-argillaceous 

 shale containing numerous specimens of Pcedeuniias transitans Wal- 

 cott of the upper portion of the Lower Cambrian fauna. The reasons 

 for placing it in the genus Olenopsis are given under notes on the 

 genus. 



The specific name is given in recognition of the excellent work 

 of Professor Roddy, of the Normal School, Millersville, who for 

 several years has been studying the areal geology of and collecting 

 fossils in Lancaster County. 



Formation and locality. — Lower Cambrian: (12 w) Silico-argilla- 

 ceous shale, in quarry just west of Fruitvale, 2 miles (3.2 km.) 

 north of Lancaster, Lancaster County, Pennsylvania. 



