204 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



Crcpicephalus unca Walcott (pi. 35, figs, i, la-c). 

 Crepicephalus unzia Walcott (pi. 34, figs. 7, ro). 

 Crcpkcphalus upis Walcott (pi. 33, figs. 4, 4c-d). 

 Crepicephalus undt. spp. (pi. 32, figs. 4, 4a). 



The American species previously referred to Crcpid^f'Iialus and 

 now referred to other genera are : 



Crepicephalus centralis Whitfield ^ Anomocarella ozvcni (Meek and Hay- 

 den). 



Crepicephalus gibbsi Whitfield ^=Ptychoparia Corda. 



Crepicephalus (?) viiniscaensis Owen ^= Ptychaspis Hall. 



Crepicephalus onustus Whitfield =: Anoiiiocarella Walcott. 



Crepicephalus roanensis Saflford = Unpublished species Walcott. 



Crepicephalus similis Safford = Unpublished species Walcott. 



Crepicephalus teunesseensis Safford ^ Unpublished species Walcott. 



Crepicephalus ? wisconseusis Owen = Lonchocephalus Owen. 



Crepicephalus (Bathyurusf) angulatus Hall and Whitfield^ Ptychoparia 

 (Emmrichella) Walcott. 



Crepicephalus (Loganellus) granulosus Hall and Whitfield = /«omjio 

 Walcott. 



Crepicephalus (Loganellus) haguei Hall and Whitfield ^ P/j'c/io/'ana 

 Corda. 



Crepicephalus (Loganellus) maculosus Hall and Whitfield = Ptychoparia 

 Corda? 



Crepicephalus (Loganellus) viontanensis Whitfield =^ Ptychoparia Corda. 



Crepicephalus (Loganellus) nitidus Hall and Whitfield := P/3»c/io/>ana 

 Corda. 



Crepicephalus (Loganella) planus Whitfield = Ptychoparia Corda. 



Crepicephalus ? (Loganellus) quadrans Hall and Whitfield = Ff3>c/io/'arta 

 Corda. 



Crepicephalus (Loganellus) simulator Hall and Whitfield = /noM3)io Wal- 

 cott. 



Crepicephalus (Loganellus) unisulcatus Hall and Whitfield ^J'tychoparia 

 Corda ? 



CREPICEPHALUS AUGUSTA Walcott 



Plate 29, figs. 6, 6a-b 



Crepicephalus augusta Walcott, 1886, Bull. U. S. Geol. Survey, No. 30, 

 p. 208, pi. 28, figs. 2, 2a-b. (Description and illustration of cranidium 

 and pygidium.) 



Crepicephalus augusta Walcott, 1891, Tenth Ann. Rep. U. S. Geol. Survey, 

 p. 653, pi. 96, figs. 9, ga-b. (Republishes illustrations of 1886.) 



Crepicephalus augusta (Walcott), Grabau and Shimer, igio. North Ameri- 

 can Index Fossils, Vol. 2, p. 283, fig. 1585. (Described and figured.) 



A detailed description of the specimen representing this species 

 was published in 1886, and nothing has been added to it since. The 

 illustrations are given in this paper in order that the American 

 species referrred to Crepicephalus may be brought together for 

 comparative study. 



