716 



ARTHROPODA 



PHYLUM VII 



Solenopl..a Angelin. Eyo-lincs present. Cambrian ; Europe, Asia, and North 

 ^'" /Sri»,-« EayB»nd, Eye-line. al«eut. Onlovician ; North America. 



Fig. 1376. 

 Neolenus serratAt., (Rominger). Burgess shale (Middle Cambrian) ; Burgess Pass British Columbia. Posterior 

 portion of an individual showing thoracic legs and caudal rami. x ^/i (after Walcott). 



Family 6. Oryctocephalidae 



Beeclier. 



Opisthoparia with large cephalon 

 and smaller pygidium, palpehral lohes 

 long and connected with the glahella. 

 Pygidium of six to nine Segments, 

 which end in spines. Cambrian. 



Oryctocephalus Walcott. Glabellar 

 furrows represented by deep pits which 

 are connected across the top of the 

 glabella by shallow furrows. Middle 

 Cambrian ; North America and Asia. 



Zacanthoides Walcott. Glabellar 

 furrows not deep, intergenal spines 

 present, thorax spinöse. 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, bnt 

 the furrow on each pleuron of the 



brian); British Columbia Group of thoracic and abdominal tliorax is diagonal instead of being 

 Iftirs. showiiit? basal mint or r.nxonoditft. and siv.in r,fo,i i,.r, o ^ ^^'^' ^^ O 



Fio. 13Y7. 

 Neolenus serratits (Rominger). Burgess shale (Middle Cam- 



legs, showing basal Joint or coxopodite, and six-iointod 1 

 with three terminal claws. x Vi (alter Walcott>! 



straight. Cambrian ; America. 



