46 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 76 



Occurrence. — Associated with numerous specimens of Glouptmrus 

 pustulatus in the basal bed of the Upper Chazy on Isle La Motte, Vt. 

 nolotype.—C?it. No. 80553, U.S.N.M. 



GLAPHURINA BREVICULA, new species 



Plate 7, Figures 17-19 



This species is based on a single imperfect cranidium that has a 

 shorter glabella than any of the other species assigned to this genus 

 and seems to differ also in other details from them. 



Occurrence. — Holston limestone, 2 miles northwest of Lexington, 

 Va. 



Uolotype.—C^t. No. 80549, U.S.N.M. 



GLAPHURINA FALCIFERA, new species 



Plate 7, Figures 20, 21 



Of this species we have four cranidia, all more or less imperfect 

 m outline. The glabella is nicely rounded in front and wider in its 

 anterior third than in the other species of the genus. The glabellar 

 depressions also differ in details, the posterior one being double and 

 its parts so arranged that they form a crudely executed figure 

 resembling a sickle that suggested the specific name. As will be 

 noted in studying figure 21, there is a shallower depression in front 

 of the deeper ones. Together they suggest and probably represent 

 the usual first, second, and third pairs of glabellar furrows. The 

 glabella and fixed cheeks are covered with regularly spaced tubercles 

 of moderate and approximately equal size. 



With these typical specimens occurred another cranidium in which 

 the sides of the glabella converge more rapidly forward, the glabellar 

 pits apparently a single, altogether more simple f)air, and the surface 

 tubercles distinctly of two sizes, with most of those covering the 

 glabella, the posterior slopes of the fixed cheeks and the middle 

 part of the occipital ring decidedly smaller and much more crowded 

 than in the holotype and other specimens that are included in the 

 types of the species. In the mentioned respects this unique cranidium 

 comes closer to G. lamottensis than to G. falcifera without, however, 

 being enough like the former to be regarded as the same species. 

 Evidently the Lower Chazyan of Tennessee contains a second species 

 of Glaphurina that remains to be figured and named. Unfortunately 

 its sole known representative had not been discovered when the plates 

 of the present paper were made up. 



Occurrence. — Found in an as yet unnamed Lower Chazyan lime- 

 stone formation that underlies a typical but thin development of 

 the Lenoir limestone and rests unconformably on the Middle Cana- 



