24 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 95 



INGLEFIELDIA Poulsen, 1927 



Inglefieldia Poulsen, Meddels. Gr0nland, vol. 70, p. 261, 1927. 

 Inglefieldia Resser, Smithsonian Misc. Coll., vol. 93, no. 5, p. 36, 1935. 



Further study of the Appalachian and other Lower Cambrian trilo- 

 bites shows the necessity of referring additional species to Inglefieldia, 

 even after certain groups are separated as new genera. Arbitrary 

 limits must be set to separate Inglefieldia from Kochiella on the one 

 hand and from Poulsenia and Antagmus on the other. If the brim 

 increases in width and is flattened, the species passes into Kochiella. 

 If, however, the rim thickens and the cranidium becomes more con- 

 vex in all its parts, the species is referable to Poulsenia. Finally, if the 

 thickening of the rim is accompanied by a reduction in width of the 

 preglabellar area with a concomitant increase in the backward projec- 

 tion of the rim in the middle, the species becomes Antagmus. 



Hitherto Inglefieldia contained the following species : 



/. porosa Poulsen /. discreta Poulsen 



/. planilimhata Poulsen /. thia Poulsen 



I . groenlandica Vo\i\i,tn I.venulosa (Poulsen) 

 /. inconspiciia Poulsen 



Inglefieldia affinis Poulsen 



Inglefieldia affinis Poulsen, Meddels. Grjzinland, vol. 70, p. 264, pi. 15, fig. 23, 

 1927. 



This species is on the border of the genus but for the present may 

 be retained in it. 



Lower Cambrian, Cape Kent ; Cape Kent, northwest Greenland. 



KINGSTONIA Walcott, 1924 



Kingstonia Walcott, Smithsonian Misc. Coll., vol. 75, no. 2, p. 58, 1924; idem, 



no. 3, p. 103, 1925. 

 Ucebia Walcott, idem, pp. 60, 118. 



It is possible that Stenopilus Raymond is also synonymous, but 

 further study is necessary to prove this point. 

 Genotype. — K. apion Walcott. 

 Range. — Apparently in the earlier beds of the Upper Cambrian. 



Kingstonia ara (Walcott) 



Ucebia ara Walcott, Smithsonian Misc. Coll., vol. 75, no. 2, p. 60, pi. 14, fig. 4, 

 1924; idem, no. 3, p. 118, pi. 17, figs. 7, 8, 1925. 



Upper Cambrian, Warrior; (loc. 107k) i mile southeast of War- 

 riors Mark, Pennsylvania. 



Cotypes. — U.S.N.M. nos. 70257, 70258. 



Kingstonia globosa (Walcott) 



Agraulos:' globosus Walcott, U. S. Geol. Surv. Mon. 8, p. 61, pi. 9, fig. 23, 

 1884. 



