NO. 3 MIDDLE CAMBRIAN FOSSILS FROM IDAHO RESSER 9 



figured. It is more like G. hoccar than the Spence shale form because 

 the doublure is not so wide. Fusion is carried nearly to the extinction 

 of the rib furrows. 



Locality 37m. 



Holotype.—V.S.'NM. no. 95037. 



ORYCTOCEPHALUS Walcott, 1886 

 ORYCTOCEPHALUS WALCOTTI, n. sp. 



Plate I, figs. 22, 23 



A small fragmentary granulated cranidium, with a typical Orycto- 

 cephalus glabella is tentatively referred to the species. 



The pygidium is nearest like O. reynoldsi, differing in having heavier 

 spines and more clearly impressed pleural grooves. 



Locality 37n. 



Holotype and paratype. — U.S.N.M. no. 95038. 



CLAVASPIDELLA Poulsen, 1927 



CLAVASPIDELLA MINOR, n. sp. 



Plate I, figs. 45, 49 



A number of specimens in the Lakeview limestone evidently belong 

 to Clavaspidella. This species is much smaller than any other thus 

 far described ; also, both the pygidial axis and the eye lobes are long. 



Locality 37n. 



Holotype and paratypcs. — U.S.N.M. no. 95039. 



UTIA Walcott, 1924 



UTIA CURIO Walcott 



Plate I, figs. 19-21 



Specific differences are not apparent between the Utia of the Lake- 

 view limestone and of the Spence shale, consequently the Idaho form 

 is identified as U. curio. 



A peculiar small pygidium characterized by its radiating furrows and 

 grooves is tentatively assigned to the species. 



Locality 37n. 



Plesiotypes. — U.S.N.M. no. 95041. 



VANTJXEMELLA Walcott, 1908 

 VANUXEMELLA IDAHOENSIS, n. sp. 



Plate I, figs. 13-15 



This species has stronger pygidial furrows than V. nortia, and also 

 larger rear spines. Comparison with the Montana species, V. con- 



