476 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



OleneUtis fremonti — Continued. page 



geographic distribution of 252 



hypostoma of 243 



compared with that of Olenellus gilhcrti 328 



gilbert i and Pcedeumias transitans 322 



in synonymy 321 



mentioned 248, 256, 285, 300, 314, 320, 327, 345 



stratigraphic distribution tabulated 251 



stratigraphic position and association 187 



Olenellus ? gigas Peach 323, pi. 40, fig. i 



Peach, in synonymy 323 



compared with Mesonacis Vermont ana 324 



Olenellus lapzuorthi 323 



Olenellus reticulatus 323 



mentioned 248, 314, 342 



stratigraphic distribution tabulated 251 



Olenellus gilberti Meek 324, pi. 36, figs. 1-17 ; pi. 43, figs. 5-6 



Holm, in synonymy 325 



Lesley, in synonymy 321, 325 



Meek, in synonymy 324 



Peach, in synonymy • 321 



Walcott, in synonymy 320, 321, 324, 325 



White, in synonymy 324 



compared with Callavia ? nevadensis 285 



Olenelloides armatus 346, 347 



Olenellus canadensis 318 



Olenellus fremonti 321-322, 329 



Olenellus gilberti var 331 



Olenellus intermedius 332 



Olenellus lapworthi 329, 332 



Olenellus thompsoni 329, 339 



Pcedeumias transitans 310, 329 



eye of compared with that of Limulus 239, 240 



Limulus Polyphemus 327 



facial sutures not present in 242 



geographic distribution of 252, 329 



hypostoma 243, 244 



compared with those of Wanncria hulli and Olenellus fre- 

 monti 328 



compared with those of Olenellus fremonti and Pcedeumias 



transitans 322 



in synonymy 285 



mentioned 248, 300, 314, 317 



segmentation of cephalon 238 



stratigraphic distribution tabulated 251 



stratigraphic position and association 184, 189 



Olenellus gilberti var 331, pi. 40, fig. 8 



compared with Olenellus gilberti and Olenellus canadensis 331 



stratigraphic distribution tabulated 251 



