NO. 3 MIDDLE CAMBRIAN FOSSILS FROM IDAHO RESSER 5 



UROTHECA Matthew, 1899 



UROTHECA SAMPSONI, n. sp. 



Plate I, fig. I 



Long, slender tubes abundant in the Rennie shale are referable to 

 this genus. The illustrated specimen appears to have a carina but is 

 merely broken in the middle. Faint annulations seem to occur on some 

 individuals. 



Locality 37m. 



Holotype. — U.S.N.M. no. 95020. 



HYOLITHES Eichwald, 1840 

 HYOLITHES IDAHOENSIS, n. sp. 



Plate I, figs. 57, 58 



A species of Hyolithcs occurs in the shale; unfortunately, most of 

 the specimens are poorly preserved. The species is evidently related 

 to H. carinafa but is larger, the carina is less pronounced, and the 

 operculum has wider wings. 



Locality 37m. 



Cotypes. — U.S.N.M. no. 95021. 



LINGULELLA Salter, 1866 

 LINGULELLA IDAHOENSIS, n. sp. 



Plate I, fig. 18 



This shell is nearest to L. isse in shape, but it is a smaller brachio- 

 pod. It is possible that this brachiopod is one of the Middle Cambrian 

 forms now included in L. desiderata. 



Locality 37n. 



Holotype. — U.S.N.M. no. 95022. 



ACROTHELE Linnarsson, 1876 

 ACROTHELE SPECIOSA, n. sp. 



Plate I, figs. 6, 7 



This form is most like A. colleni, from which it differs in having 

 weaker ribs and growth lines, but more particularly in the narrowness 

 of the false area. 



Locality 37n. 



Cotypes. — U.S.N.M. no. 95023. 



