Glyptaspis abbreviata sp. nov. 



Right antero-ventrolateral plate. Natural size 



Portage beds; \'alois (North Hector), N. Y. 



Original in New York State Museum 



Similarly ornamenteJ dermal plates belonging probably to the same 

 species, and accompan.ied 1))' remains of U i n i c h t h \- s new- 

 berr)i Clarke, Asi)idichth)"s, and other Arthrodires, occur in the 

 New Albany (= (lenesee) Black slate near Louisville, Ky. In the 

 description of this form | p. 147-49], ^^^^ locality is wrongly stated to 

 be near Lexington. 



