424 REPORT ON THE STATE CABINET. 



GENUS LICHAS, Dalman. 



LiCHAS BREVICEPS? H.ALL. 



PLATE XXI, FIGS. 12 13, 14. 

 Lichas breviceps, Hall ; in Transactions Albany Institute, IV, p. 222. 1862. 



The specimens figured are a head, which in all important characters 

 corresponds with Z. breviceps as described by me. The pygidium, fig. 14, 

 occurs on the same specimen of rock, and corresponds in size to the head, 

 both figures being enlarged two diameters. 



The pygidium differs from the pygidia associated with the head of X. 

 breviceps in the Waldron locality only in the central posterior indenta- 

 tion, and in this respect corresponds with L. nereus, which it otherwise 

 closely resembles. It is therefore unnecessary to propose any other name 

 until we have better matei'ial. Figs. 12 and 14 are from Bridgeport, 

 Illinois. The specimen fig. 13 is from Grafton, Wisconsin, and is repre- 

 sented of the natural size, the terminal portion having been restored to 

 correspond with fig. 14. 



Lichas (sp.)- 



The pygidium of a species of this genus in limestone from Grafton, 

 Illinois, has a strong rounded axis, with four rings besides the terminal 

 one. The lateral lobes are somewhat convex, but the extremities are 

 broken off, so that its entire form cannot be determined. 



Lichas pugnax. Winch, and Mar. 



PLATE XXV, FIG. 20. 



Lichas pugnax. Winch. & Marct, Mem. Bost. Soc. Nat. Hist., I, p. 103, Plate iii, fig. 10. 1865. 



The figure given is of the pygidium of the original specimen in the 

 collection of Prof. Marcy. 



Formation and Locality.' — In the Niagara limestone at Bridgeport, 

 Illinois. 



Lichas obvius, n. s. 



plate XXV, FIG. 19. 



Glabella gibbous, broad in front, length equal to the width between the 

 eyes ; occipital and dorsal furrows sharply defined ; lateral lobes 

 simple, of nearly equal width throughout, suddenly contracting near 

 the base ; surface finely pustulose. 



Formation and Locality. — In limestone of the Niagara group, at Lyons, 

 Iowa. From Dr. Farnsworth. 



