404 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



glabella and a narrow frontal margin, and do not appear to come 

 within the limits of Agraiilos, Anomocare, Ptychoparia, Coosia or 

 Solenopleiira. 



LISANIA ? BREVILOBA, new species 



Plate 66, figs. 3, 2,a-c 



With only the cranidia of the type species for comparison it is dififi- 

 cult to identify this species as belonging to the genus, especially as 

 the frontal border of L. hura has both a frontal limb and border of 

 the Anomocarella type and L. ? brcviloba has a flat or slightly con- 

 cave frontal limb without a trace of a frontal border ; in this char- 

 acter it is similar to the species Lisania alala^ from China. Not 

 wishing to create a new genus to include L. ? brcviloba, it is tenta- 

 tively referred to Lisania. 



The characters of the species are fairly well exhibited by the 

 illustrations. The surface of the test is roughened by small shallow 

 pits that on some specimens appear to go deep into its layers and 

 give the surface a punctate appearance. 



The largest cranidium has a length of 13 mm. A broken specimen 

 (fig. 3) has nine segments of the thorax attached to a cranidium. A 

 small cranidium (fig-. 3^7) indicates a rather large palpebral lobe, and 

 ridge crossing the fixed cheek which is a character of species referred 

 to Lisania. A pygidium (fig. 3c) was associated in the same rock 

 with the cranidia and may be tentatively considered as possibly 

 belonging to this species. 



Formation and locality. — Upper Cambrian: (ii8a) Maryville 

 limestone ; Bird Bridge road, 1.5 miles (2.4 km. ) south of Greeneville, 

 Greene County, Tennessee. 



Family Ill.enid^ Corda 

 Genus ILL^NURUS Hall 



Illicnunis Hall, 1863, Sixteenth Ann. Rept., New York State Cab. Xat. Hist., 

 p. 176. (Describes genus and the genotype Illanurus quadratus.) 



Illcrnurus Hall, 1867, Trans. Albany Inst., Vol. V, p. 167. (Reprint of paper 

 of 1863.) 



The genus Illcrnurus was proposed by Dr. James Hall for what he 

 considered to be an Ilhrnus-like trilobite of the " Primordial " fauna. 

 The quadrate form of the cranidium and large free cheeks distin- 



' Research in China, Vol 3, The Cambrian Faunas of China, p. 165, pi. 

 figs. 19, 19'. 



