OLENELLUS AND OTHER GENERA OF MESONACID^ 



Pwdciimias iransitans — Continued. page 



compared with OleneUus gilberti 310, 329 



Olenellus lapzvorthi 331, 332 



Olcnelliis logani 334 



Olenellus thompsoni 306, 307, 308, 338, 339 



Mesoiiacis vcrmontana 306, 308, 338 



development of cephalon of 237 



thorax in 245 



geographic distribution of 253 



hypostoma 243 



compared with those of Olenellus fremonti and Olenellus gil- 

 berti 322 



mentioned 233, 234, 242. 248, 266, 302, 303 



path of facial suture in 242 



stages passed through in development of 308 



stratigraphic distribution tabulated 251 



surface of compared with that of Pared oxides 307 



young cephalon from Alabama described 308, 309 



young compared with those of JVanneria halli 297 



young stages of dorsal shield 307 



Palpebral segment defined 238 



pannula, see Micromitra (Iphidella). 



Paradoxidcs. anterior pair of furrows in 2>?>2i 



development of, shown in diagram 249 



elongation of second segment in 245 



followed by Olenellus [Whitfield] 313 



from St. Albans, Vermont figured text figs. 10 and n, p. 255 



mentioned 247, 255 



preceded by Olenellus 313 



surface of, compared to that of Pccdcinnias 307 



asaphoides Barrande, in synonymy 269 



Emmons, in synonymy 269, 336 



brachycephalus Emmons, in synonymy 269, 336 



harlani, compared with Holmia broggeri (Shimer) 254-255, text figs. 



12 and 13, p. 255 



harlani, mentioned 254 



hicksi, mentioned 276 



kjerulfi, Ford, in synonymy 288 



kjerulfi Linnarsson, in synonymy 288 



Walcott, in synonymy 288 



niacrocephahis Barrande, in synonymy 269, 2>?>7 



Em^mons, in synonymy 269, 336 



olandicus, mentioned 287, 290 



pusillus, anterior pair of glabellar furrows in 243, ^^;i 



spinosus, anterior pair of glabellar furrows in 243, 2>33 



mentioned 299 



tessini, mentioned 287 



thompsoni Barrande, in synonymy 2)27 



Billings, in synonymy 305, 2>2>7 



Emmons, in synonymy 2,2,7 



