8o SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



collected in a low bluff on the shore of Tschang-hsing-tau island, 

 east of Niang-niang-kung-, Liau-tung, ]\Ianchuria, China. 

 Collected by J. P. Iddings and Li San. 



PTEROCEPHALUS ? LICHES, new species 



Plate 14, fig. 12 



This species is represented by four specimens of the pygidium. It 

 is quite unlike the pygidium referred to P. husiris Walcott and with 

 the discovery of entire specimens of the dorsal shield it may be found 

 that the generic reference is incorrect. 



The pygidia average 4 mm. in length and are finely preserved in 

 the compact limestone matrix. 



Formation and locality. — Middle Cambrian: (35n) Fu-ch6u series; 

 limestones near the base of the series just above the white quartzite, 

 collected in a low bluff on the shore of Tschang-hsing-tau island, 

 east of Niang-niang-kung, Liau-tung, Manchuria, China. 



Collected by J. P. Iddings and Li San. 



Genus INOUYIA, new genus 



The species referred to this genus are represented only by the 

 cranidium. This in the genotype has a swollen, tumid frontal limb, 

 small palpebral lobes, a convex and more or less subrectangular 

 glabella, strong dorsal furrows about the glabella, and clearly marked 

 glabellar furrows. 



Surface apparently smooth, but with a str.ong lens it has a slightly 

 roughened appearance caused by a shallow, irregular pitting. 



Genotype. — Agraulos ? capax Walcott^ (pi. 14, fig. 13). 



The swollen frontal limb, small palpebral lobes, and convex gla- 

 bella at once suggest Agraulos (see pi. 15) and in fact all of the 

 species now referred to Inouyia with the exception of /. titiana 

 (Walcott) were at first referred to Agraulos. My reasons for sepa- 

 rating them and creating the genus Inouyia are that the tumidity of 

 the frontal limb is so pronounced as to become a marked feature and 

 the glabella is more rectangular in the typical species. To these 

 should be added the general effect of the cranidium when compared 

 directly with the cranidium of Agraulos ceticephalus (Barrande).' 

 I think it quite probable that when entire specimens of the dorsal 



'Walcott, 1906, Proc. U. S. Nat. Mus., Vol. 30, p. 580. 



" Systeme Silurien du Centre de la Boheme, Vol. i, 1852, pi. 10, figs. 1-21. 

 Barrande referred the species to the genus Arionellus, a synonym of Agraulos. 



