NO. 5 CAMBRIAN TRILOBITES RESSER I3 



Asaphiscus wheeled Meek 



Asapliiscus zuhcclcri Meek, 6th Ann. Rep. U. S. Geol. Surv. Terr., p. 485, 



1873. 

 Asaphiscus wheeleri White, Rep. U. S. Geogr. Surv. West looth Meridian, 



vol. 4, p. 43, pi. 2, figs, la-f, 1877. 

 Asaphiscus wheeleri Walcott, U. S. Geol. Surv. Bull. 30, p. 220, pi. 31, figs. 3, 



Za; pi. 25, fig. 9, 1886. 

 Asaphiscus zvheeleri Walcott, Smithsonian Misc. Coll., vol. 64, no. 5, p. 390, 



pi. 58, figs, i-ig, 1916. 



Meek did not figure this species when he described it. Later White 

 figured six specimens, stating that they were those used by Meek. 

 White's figure if is the tail of an almost entire individual. The speci- 

 men shown in figure i^ is lost, and it is possible that several other 

 unmarked specimens were used by ]\Ieek. In 1886 Walcott presented 

 two figures, the entire shield being a composite of Meek's original 

 cotypes. The head .shown in figure 3a cannot be located. Walcott 

 (1916) figured eight specimens. Figure i is an individual found by 

 G. K. Gilbert and is unusually large and complete. Figure i^ is one 

 of Meek's original cotypes, whereas la is again a composite. The 

 small head shown in irf is from locality loy near Marjum Pass, sev- 

 eral miles from Antelope Springs. Unfortunately, this head was not 

 prepared, and hence the figure is of little worth. All published figures 

 show the rim as thickened, which it is not. 



Middle Cambrian, Wheeler; (loc. 4) Antelope Spring, House 

 Range, Utah. 



Cotypes. — U.S.N.M. no. 8576 (6 specimens) ; plesiotypes, nos. 

 62754-62760. 



BATHYURISCUS Meek, 1873 



Bathyuriscus Meek, 6th Ann. Rep. U. S. Geol. Surv. Terr., p. 484, 1873. 

 Bathynriscus Walcott, U. S. Geol. Surv. Bull. 30, p. 215, 1886. 

 Bathyuriscus Walcott, Smithsonian Misc. Coll., vol. 64, no. 5, p. 330, 1916. 

 Bathyuriscus Raymond, Amer. Journ. Sci., 5th ser., vol. 15, p. 310, 1928. 



If the genus is restricted to the forms agreeing with the genotype, 

 only a few described species remain, but many new species will be 

 described from the more recent collections. As the genus is herein 

 described, the species fall into two groups : those with two marginal 

 spines at the anterior corners of the pygidium ; and the typical group, 

 which lacks them. Inasmuch as all other characters appear to agree, 

 this feature is not regarded as of generic value. 



Genotype. — Bathyuriscus ? haydcni Meek 



Range. — Middle Cambrian. 



