SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



OlcncUiis — Continued. 



(Holmia) — Continued. page 



cartlandi Raw, in synonymy 282 



kjcrulft Cole, in synonymy 289 



Freeh, in synonymy 289 



Walcott, in synonymy 289 



zvalcottanus Wanner, in synonymy 302 



(Mesonacis) asaphoides Beecher, in synonymy ^71 



Burr, in synonymy 271, 284 



Clarke and Ruedemann, in synonymy 272 



asaphoides ? Grabau, in synonymy 271, 284 



broggeri Walcott, in synonymy 279 



mickwitzi Freeh, in synonymy 262 



Walcott, in synonymy 262 



vermontana Cole, in synonymy 266 



Walcott, in synonymy 261, 266, 267, 270, 271 



(Olenelloides) Peach, in synonymy 345 



armatus Peach, in synonymy 347 



(Olenus) asaphoides Ford, in synonymy 270 



Olenus Hall, in synonymy 267 



asaphoides Fitch, in synonymy 269 



(Olciiclhis) giibcrti Gilbert, in synonymy 324 



howelli Gilbert, in synonymy 324 



Opisthoparia Beecher, defined 235 



Orthotheca adainsi, mentioned 300 



Packard, A. S., bibliographic reference 376 



on the eyes of Limulus and trilobites 239 



Padeumias, new genus 304 



anterior glabellar lobe in 243 



compared with Mesonacis 266, 304, 306 



Olcnelhis 304, 306, 307, 308 



delimitation of genus 248 



development of, shown in diagram 249 



eye lobes in 239 



genal and intergenal spines in 237 



history of founding of genus 266, 304 



median spine the telson of OlcncUus 245 



mentioned 236, 247, 250, 269, 309, 327 



new genus, species referred to the genus listed 232 



notes on proposal of genus 304 



segmentation of cephalon 238 



stage in development of Mesonacidcc discussed 308 



Olenellus mentioned 313 



stages passed through in development of 308 



state in development of thorax defined 245 



stratigraphic distribution tabulated 251 



Pcrdcuiiiias transitans, new species 305, pis. 24, 25, 32-34, and 44 



compared with Elliptoccphala asaphoides 310 



Olenelloides annatus 346, 350 



Olenellus claytoni 320 



