OLENELLUS AND OTHER GENERA OF MESONACID^ 



PAGE 

 Wanner. A., acknowledgments 234 



bibliographic reference 378 



mentioned 233, 234, 266, 297, 304, 305, 306, 307 



Wanneria, new genus 296 



anterior glabellar lobe in 243 



compared with Callavia 297, 299 



Elliptocephala 298 



Holmia 288, 298 



Mcsonacis 298 



Ncvadia 298 



delimitation of genus 248 



development of, shown in diagram 249 



eye lobes in 239 



genal and intergenal spines in 237 



geographic distribution of 253 



mentioned 236, 246, 247, 250, 276, 309 



new genus, species referred to the genus listed 232 



stratigraphic distribution tabulated 251 



stratigraphic position of 297 



gracile, new species 298, pi. 38, figs. 15-24 



a form intermediate between Callavia and Wanneria 299 



associated species listed 300 



compared with Pcachella iddingsi 343 



hypostoma more nearly related to Callavia 299 



mentioned 248 



stratigraphic distribution tabulated 251 



stratigraphic position of discussed 300 



young compared with those of Elliptocephala asaplvidcs 299 



halli, new species 301, pi. 31, figs, i-ii 



compared with Wanneria zualcotfanus 301, 302, 303 



hypostoma compared to that of Olenelhis gilbcrti 328 



hypostoma of 243 



mentioned 248, 296, 302, 309 



stratigrapliic distribution tabulated 251 



young compared with those of Pcedeumias and Elliptocephala. 297 



young stages of growth in 297 



-cvalcottanus (Wanner) 302, pi. 30, figs. 1-12 ; pi. 31, figs. 12 and 13 ; 



and pi. 44, fig. 6 



compared with Callavia broggeri 303 



Callavia callavei 303 



Callavia carflandi 283 



Olenellus claytoni 319 



Olenelhis thonipsoni and Olenelhis thompsoni crassi- 



marginatus 303 



Wanneria halli 301, 302, 303 



development of thorax in 244 



mentioned 233, 248, 296, 299, 302 



stratigraphic distribution tabulated 251 



