. Geological magazine . ength of the lastpair behind the axis give a general appearance of similarity. Though the head-shield shows such distinct and unique features,particularly in the lobation of the glabella, the resemblance of thepygidium to that of several species of Olenoides (0. quadriceps,Meek, O. wahsatcheiisis, Hall & Whitfield, 0. Fordi, Walcott)deserves notice. The pleurae recall those of Paradoxides, while thespiuose rings of the axis remind one of Olenoides (Zacanthoides)typicalis (Walcott) and 0. neoadensis (Meek). Oryctocephalus primus (Walcott) is found in the Middle CambrianL
. Geological magazine . ength of the lastpair behind the axis give a general appearance of similarity. Though the head-shield shows such distinct and unique features,particularly in the lobation of the glabella, the resemblance of thepygidium to that of several species of Olenoides (0. quadriceps,Meek, O. wahsatcheiisis, Hall & Whitfield, 0. Fordi, Walcott)deserves notice. The pleurae recall those of Paradoxides, while thespiuose rings of the axis remind one of Olenoides (Zacanthoides)typicalis (Walcott) and 0. neoadensis (Meek). Oryctocephalus primus (Walcott) is found in the Middle CambrianLimestone, east of Pioche, Nevada,- but so far as I know the genushas not been recorded elsewhere. 1 Bull. Geol. Surv., No. 30 (1886). Cambrian Faunas of North America,pt. 2, p. 210, pi. xxix, figs. 3, Za: Tenth Ann. Rep. Geol. Surv., 1888. The Fauna of the Olenellus Zone, p. 653, pi. xcv, figs. 4, 4a. ^ Walcott: Bull. Geol. Surv., No. 30 (1886), p. 210. / eK- - h ^^^l, U- ^^ ^ cc (^T* ::. » . * 4 \^^. \ ^
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