474 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



Olcncllus — Continued. page 



Ford, in synonymy 261, 267, 311 



Hall, in synonymy 311 



Holm, in synonymy 261, 267, 286, 311 



Lindstrom, in synonymy 268, 312 



Marcou, in synonymy 311, 312 



Marr on the telson of 313-314 



Peach, in synonymy 312 



on the telson of 313 



Peach and Home, in synonymy 312 



Pompeckj, in synonymy 312 



Walcott, in synonymy 267, 274, 311, 22,7, 338, 340 



Weller, in synonymy 312 



Whitfield on the telson of 313 



anterior glabellar lobe in 242, 243 



cause of enlargement of third segment in 245 



compared with Albert cUa tg 



Mesonacis 304 



Nevadia 256 



Pcodeumias 304 



delimitation of genus 248 



development of, shown in diagram 24Q 



followed by Paradoxides 313 



eye lobes in 239 



eyes of, compared with those of Liinulus 240, 327 



genal and intergenal spines in 237 



geographic distribution of 252, 253, 314 



line extinct in Lower Cambrian time 249 



maculae on hypostoma of 244 



mentioned. ..60, 63, 81, 86, 87, 233, 234, 236, 244, 247, 250, 256, 263, 306, 



317, 323, 342 



non-occurrence on Asiatic continent 314 



preceded by Paradoxides [Whitfield] 314 



segmentation of cephalon 238 



species referred to the genus listed 232 



stage in development of thorax defined 245 



stages passed through in development 245, 313 



stratigraphic distribution tabulated 251 



telson of, compared with that of Liiiiulus 246, 312 



telson not a pygidium 246 



telson the median spine of Pcedcumias 245 



zone, defined 250 



Olenellus argcntus, new species 314, pi. 40, figs. 12-16 



associated fossils listed 315 



compared with Olenellus freinoiiti 315 



Peachclla iddingsi 315 



mentioned 248, 314 



stratigraphic distribution talndated 251 



