12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



Inasmuch as Shumard's types were not illustrated and were later 

 destroyed by fire, the propriety of recognizing his species may be 

 questioned, but Walcott long ago set aside specimens as the species, 

 and since they agree with Shumard's description, little doubt of their 

 identity remains. 



Upper Cambrian, Cap Mountain (Aphelaspis depressa zone) ; (loc. 

 dj^ Potatotop, 7 miles northwest of Burnet, Texas. 



Plesiotypes. — U.S.N.M. no. 90172. 



ASAPHISCUS Meek, 1873 



Asaphiscus Meek, 6th Ann. Rep. U. S. Geol. Surv. Terr., p. 485, 1873. 

 Asaphiscus Walcott, Smithsonian Misc. Coll., vol. 64, no. 5, p. 381, 1916. 



Asaphiscus was made in a footnote, without illustrations of the type 

 species. Subsequently, the type and other species were well illus- 

 trated, but as now constituted several distinct genera are included in 

 Asaphiscus. 



Diagnosis.- — Entire trilobite subelliptical. Cephalon semicircular in 

 outline. Glabella wide, subconical, with only faint traces of glabellar 

 furrows ; occipital furrow also almost obsolete. Brim wide ; rim wide, 

 slightly thickened, flat, suture intramarginal for a short distance. 

 Fixed cheeks narrow ; postero-lateral limbs triangular ; palpebral lobes 

 moderately bowed. Free cheeks small, simple, without or with short 

 genal spines. 



Nine thoracic segments in genotype. 



Pygidium nearly as large as cephalon. Pleural furrows weak ; when 

 doublure shows, it appears to have a wide rim. 



Genotype. — A. ivheeleri Meek. 



Range. — Middle Cambrian. 



Species formerly referred to Asaphiscus: 



A. agatho ^= Genus undet. A. capclla ^ Glyphaspis 



A. anaxis = Genus undet. A. duris = Genus undet. 

 A. bradleyi =z (new genus — Canadian A. florus^ Genus undet. 



age) A. granulatus ^ Wccksina 



A. calanus ■■^= Coosia A. minor = Cedaria 



A. cahnus := Glyphaspis A. nnispimis =. Weeksina 

 A. camma =: Glyphaspis 



DESCRIBED SPECIES REFERRED TO ASAPHISCUS 



At present Asaphiscus iddingsi Walcott (part) from Manchukuo 

 is the only described species besides the genotype, remaining in the 

 genus, but other new species are at hand. 



