86 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



limb, larger palpebral lobes, and more elongate glabella. From 

 Chiiangia nais and C. fragmenta it differs in its longer palpebral 

 lobes and in the outline of the glabella. 



Formation and locality. — Upper Cambrian: (Cii) crystalline 

 limestone 60 feet (18 m.) above the base of the uppermost limestone 

 member, 2.1 miles (3.4 km.) southwest of Yen-chuang. Sin-t'ai Dis- 

 trict, Shan-tung, China. 



Collected by Eliot Blackwelder. 



Genus LEVISIA, new genus 



This genus is proposed to include a group of small trilobites repre- 

 sented by Agraulos agenor Walcott.^ The cranidium is strongly 

 convex ; glabella truncato-conical, tumid, and with only a trace of 

 glabellar furrows ; occipital ring narrow at the sides, broadening 

 rapidly toward the center, convex, and extending backward into an 

 obtuse spine. Frontal limb very narrow and passing almost without 

 any line of demarcation into the rather broad, slightly convex frontal 

 margin of the cephalon. Fixed cheeks tumid, about half as wide as 

 the glabella and with small palpebral lobes midway of their length. 

 Postero-lateral limbs rather short and marked by a deep, narrow, 

 intermarginal posterior furrow that separates a narrow, rounded 

 margin. 



Genotype. — Agraulos agenor Walcott^ (pi. 15, fig. 7). A second 

 species, Levisia adrastia (Walcott) " has the same generic charac- 

 ters. Its surface has the same pitting and in addition a few relatively- 

 large, scattered granules. 



LEVISIA RICHARDSONI, new species 



Plate 17, figs. 4, 4a 



Two species of this genus occur with an Upper Cambrian fauna 

 in the boulders of the conglomerate at Point Levis, opposite Quebec, 

 Canada. The first I shall give the name of Levisia riclmrdsoiii in 

 recognition of the fine collecting work done by ]\Ir. J. Richardson 

 under the direction of Sir William E. Log-an. 



^ Walcott, 1905, Proc. U. S. Nat. Mus., Vol. 29, p. 44. 

 " Idem, p. 61. 



