BUPPALO SOCIETY OE NATURAL SCIENCES 103 



there broken up into rows of dots. He referred it to the genus 

 Glyptaspis of Newberry, under the specific name abhreviata. 



Apart from this species Glyptaspis is known only by the type species 

 G. verrucosa Newberry. A cast of Eastman's specimen is in the 

 American Museum and we have compared it carefully with New- 

 berry's types of G. verrucosa which are also in the American Museum; 

 and we have come to the conclusion that the abhreviata plate does not 

 belong in the genus Glyptaspis. G. verrucosa is ornamented with 

 large tubercles, closely rounded, and arranged in rows, whereas G. 

 abbreviata is ornamented with thread-like lines and dots which are 

 much finer than in the former species. Moreover, the abbreviatum 

 plate seems too short and broad to belong with suph plates as those 

 named G. verrucosa; they indicate an animal of very different pro- 

 portions. The type of G. abbreviata belongs properly in the genus 

 Holonema of Newberry, in which it may stand as a distinct species 

 distinguished from the other species known, by the width of the spaces 

 separating the lines of ornamentation and by the breaking up of these 

 lines into discrete dots, even more so than in Holonema rugosum. 



The species was previously known from the Portage of western New 

 York and from the Genesee of Kentucky-Indiana. Three specimens 

 in the Buffalo Museum establish its presence in the Conodont bed 

 (basal Genesee), and in the limestone layer above the Genundewa, 

 and thus prove it to range in western New York from the base of the 

 Genesee up into at least the lower portion of the Portage. 



E 2009 Imperfect plate, ornamented with nearly straight, parallel 

 beaded lines. 



Conodont bed (Lower Genesee) ; Eighteen Mile Creek, 

 North Evans, near Buffalo, N. Y. Collected by W. L. 

 Bryant. 



E 2444 Lateral or ventral plate with the characteristic ornamenta- 

 tion of this species, with straight margins on three sides. 

 It measures 1 1.5 by 9 cm. 



Other data same as preceding. 



E 2025 A flat, subrectangular plate apparently belonging to the 

 ventral armor (PI. 31). It is almost complete, and its 

 ornamentation agrees closely with that of the t5^e speci- 

 men of Glyptaspis abbreviata figured by Eastman. At 

 the upper and lower margins of the plate, the ornamenta- 



