540 INDEX 



Obolus — Continued. page 



cetus ( Walcotf) , listed :^j^ 



(Liiigulepis) rro^y Walcott (=i Liiigulclla (Liiignlcfyis) cros), gen- 

 eric references 15 



(Lingulepis f) sp. undt. Walcott {^= Lingulella {Lingulepis ?) sp. 



undt.) , generic references 15 



(IVestoiiia) blackzveldcri Walcott, listed. Ku-shan 66 



Kiu-lung 65 



stratigraphic and geographic position 45 



(IVestonia) chuarensis (Walcott), listed 273< 374 



(Westonia) ella (Hall and Whitfield), figured, pi. 44, figs. 6-10. .. . 300 



associated with Vanuxemella contracta 222 



identified as Rustella edsoni var. pentagonalis Rothpletz. . . . 293 



from Park shale (footnote) 268 



listed 292, 2>i7, 339. 409 



{Westonia) euglyphus (Walcott), listed 373 



(Westonia) sp. undt., listed, Ch'ang-hia 68 



stratigraphic and geographic position 45 



ohscura, see Agraulos. 

 obscurus, see Obolus. 

 occidentale, see Cryptozoan. 

 occidentalis, see Bathyuriscns (Poliella). 



Ogygia klotzi Rominger, synonymic reference 2i77 



parabola Hall and Whitfield, synonymic reference 369 



producta Hall and Whitfield, compared with Bathyuriscns 332 



synonymic reference 369 



(Ogygopsis) klotzi Matthew, synonymic reference 377 



Ogygiocarinse Raymond, subfamily described 375 



genera included, named 375 



synonymy 375 



Ogygiocaris Angelin, compared with Ogygopsis 376 



compared with Orria 380 



under Ogygiocarinse 375 



buchii (Brongniart), compared with Ogygopsis 2>7^ 



Ordovician form of Ogygopsis 377 



suggested by Orria 380 



dilitata (Bfunn), compared with Ogygopsis 376 



Ogygopsis Walcott, genus described 375 



compared with Ogygiocaris Angelin 2/6 



Orria 376, 380 



distinctive, North American fauna 70 



genotype, Ogygia klotzi Rominger 376 



observations 376 



relation to Orria 380 



stratigraphic range and geographic distribution 376 



synonymy 375 



under Ogygiocarinse 375 



