716 



ARTHEOPODA 



PHYLUM VII 



Solenopleura Angelin. Eye-lines present. Cambrian ; Europe, Asia, and North 

 America. 



Hystricurus Raymond. Eye-lines absent. Ordovician ; North America. 



;v^:«-.'y-''^u 



Vk.. lliTO. 



Neolenus serratus (Roiuingei). Burgess shale (Middle Cambrian) ; Burgess Pass, British Columbia, 

 portion of an individual showing thoracic legs and caudal rami, x 3/j (after Walcott). 



Posterior 



Fig. 1377. 



Neolenua serratus (Rominger). Burgess shale (Middle Cam- 

 brian) ; British Columbia. Group of thoracic and abdonnnal 

 legs, showing basal joint or coxopodite, and six-jointed leg 

 with three terminal claws, x Vl (=ifter WalcottV 



Family 6. Oryctocephalidae 

 Beecher. 



Opisthoparia with large cephalon 

 and smaller 2Jygidium, 2J(ilpebral lobes 

 long and connected with the glabella. 

 Pygidium of six to nine segments, 

 lohich end in spines. Cambrian. 



Oryctocephabis Walcott. Glabellar 

 furrows represented by deep pits wliicL. 

 ■ire connected across the top of the 

 glabella by shallow fixrrows. Middle 

 Cambrian ; North America and Asia. 



Zacanthoides Walcott. Glabellar 

 furrows not deep, intergenal spines 

 present, thorax spinose. Middle 

 Cambrian ; North America. 



Olenoides Meek. Pygidium larger 

 and with shorter spines, and eyes 

 smaller than in Zacanthoides. Cam- 

 brian ; America. 



Neolenus Matthew (Figs. 1343, 

 1376, 1377). Like Olenoides, but 

 the furrow on each pleuron of the 

 thorax is diagonal instead of being 

 straight. Cambrian ; America. 



