78 



Famly LICHIDiE. 



LICHAS HANOVERENSIS, n. Sp. 



Plate VIII, Fig. 6, front view of head; Fig. 7, dorsal view of 

 head without cheeks. 



Glabella divided into three lobes by straight, longitudinal 

 lines. The middle lobe is exceedingly high and quite evenly 

 convex, from its posterior extension to the anterior border. It 

 is like a cylinder bent in the form of two-thirds of a circle and 

 covered with large and small tubercles. The lateral lobes are 

 quite small and look like little auricles on the side of the cen- 

 tral lobe. The anterior border of the head is in the form of a 

 very small rounded rim, depressed at the lines dividing the 

 glabella. A broad, rounded, transverse depression separates 

 the central lobe of the glabella from the neck furrow, and upon 

 each side, behind the lateral lobes of the glabella a transverse, 

 elliptical swelling extends to the inner side of the visual organs. 

 Movable cheeks not preserved. 



This species resembles L. palmata or L. scabra, figured by 

 Barrande, more than any of the described American species. 



Found in the Niagara Group at Hanover, Indiana, and now 

 in the collection of Wm. F. E. Gurley. 



LICHAS BYRNES ANUS, n. Sp. 



Plate VIII, Fig. 8, front view ot head; Fig. 9, dorsal view of 

 the head without the cheeks. 



The glabella is covered with tubercles and divided into three 

 lobes by slightly diverging lines on the dorsal side, but parallel 

 lines in the front. The middle lobe is extended longitudinally 

 into an obtuse point in front, far beyond the lateral lobes. 

 The dorsal side is straight and convex longitudinally; the front 

 is high, convex and very gently rounded, from the obtuse point , 



