OF CAPE BRETON AND NEWFOUNDLAND. 157 
Locality—Topsail Head, Conception Bay, Newfoundland. 
This species may be distinguished from Selenopleura parva, Linrs., by its more gibbous 
form, long glabella, and distinct glabellar furrows and ocular fillet; from S. cristata, 
Lins., by its long, overhanging glabella and the narrow anterior limb of the shield; from 
S.? stenometopa, Ang., by its narrow, unangulated anterior margin; from S. holometopa, 
Ang., by the short and narrow anterior margin, and more advanced position of the 
eyelobe ; from S. comn unis, Bill., and S. Acadica, Whiteaves, by the same feature and the 
longer glabella. 
