500 INDEX 



Crepicephalus — Continued. page 



. upis, new species, described 318 



figured, pi. 33, figs. 4, 4a-d 248 



compared with Crepicephalus liliaiia and C. coosciisis 218 



formation and locality 218 



listed 204 



stratigraphic range 202 



F zvisconscnsis Owen, in synonymy 198 



referred to Lonchocephahts * 204 



related to L. hamulus 188 



sp. undt. (i), described 218 



figured, pi. 32, figs. 4. 4« 246 



compared with Crepicephalus iowensis 218 



formation and locality 218 



sp. undt. (2), .described 218 



compared with Crepicephalus camiro 219 



Crepicephalus iowensis 218 



formation and locality 219 



undt. spp., stratigraphic range 202 



listed 204 



{Bathyurus?) angulatus Hall and Wliitfield. referred to Ptychoparia 



(Emmrichella) 204 



(Loganellus) granulosus Hall and Whitfield, referred to Inouyia. . 204 

 (Loganellus) haguci Hall and Whitfield, referred to Ptychoparia. . 204 

 (Loganellus) maculosus Hall and Whitfield, referred to Ptychoparia 204 



{Loganellus) montanensis Whitfield, discussed by Whitfield 202 



referred to Ptychoparia 204 



{Loganellus) nitidus Hall and Whitfield, referred to Ptychoparia. . 204 



{Loganella) planus Whitfield, referred to Ptychoparia 204 



? {Loganellus) quadrans Hall and Whitfield, referred to Ptycho- 

 paria 204 



{Loganellus) simulator Hall and Whitfield, referred to Inouyia... 204 

 {Loganellus) unisulcatus Hall and Whitfield, referred to Ptycho- 

 paria 204 



Crustacean remains, Greyson shales 154 



Cryptozoan, now Collcnia, an algal deposit 98 



Cryptocoan f occidentale Dawson, cited (footnote) 84 



Cryptozoon, true, older than Cambrian unknown (footnote) 98 



Cryptozoon Hall, Cambrian algal forms allied to 79 



compared with Gallatinia perte.va 117 



comparison with " Lake Balls " 103 



nature of 84 



not mentioned in Garwood's work 90 



resemblance to Collenia 1 1 1 



suggested by Peale's so-called " fossil turtles " 112 



and its allies, classified as semisphaerical 104 



proliferuni Hall, figured, pi. 16, fig. i 142 



characterized iii 



Ctenocephalus cxsulans Linnarsson, compared with Acrocephalitcs 176 



*Text should read Saratogia, instead of Lonchocephalus, p. 204. 



