NO. 5 CAMBRIAN TRILOBITES 365 



Moose Pass, between Moose River and Calumet Creek, lo miles 

 (16.1 km.) east-northeast of the summit of Robson Peak, northwest 

 of Yellowhead Pass, Robson Park, British Columbia, all in Canada. 



DOLICHOMETOPUS(?)DEOIS Walcott 



Plate 54, figs. I, la-m, 2 



Dolichotnetopus deois Walcott, 1905, Proc. U. S. Nat. Mus., Vol. 29, p. 94. 



(Described and discussed as a new species essentially as below.) 

 Bathyuriscus asiaticus Lorenz, 1906, Zeits. deuts. geol. Gesells., Vol. 58, Pt. 2, 



P- 73, pl- 5, figs. i-S- (Species characterized and illustrated) 

 Amplioton steinmanni Lorenz, 1906, Idem, Vol. 58, Pt. 2, p. 75, pl. 4, figs. 15- 



17. (Species characterized and illustrated.) 

 Dolichometopus deois Walcott, 1913, Research in China, Vol. 3, p. 216, pl. 21, 



figs. 13, i3a-d; pl. 22, figs, i, la-h, 2, 2a-b. (Species described as below 



and correlated with the two preceding species of synonymy.) 



T4iis species is represented by the central portions of the cephalon, 

 associated pygidia, hypostomse and thoracic segments. Glabella and 

 fixed cheeks moderately convex ; glabella prominent, moderately con- 

 vex, and marked by three pairs of rather short, very faintly impressed 

 furrows ; the sides of the glabella are subparallel for a short distance 

 near the base and then are gently inclined outward to the rounded 

 front margin ; occipital furrow shallow, rounded, and merging into 

 the strong occipital ring ; the latter is narrow at sides, broadening 

 rather rapidly to the base of a small, backward-sloping occipital 

 spine ; in front the glabella ctn-ves rather abruptly downward, giving 

 the anterior portion a convex appearance ; dorsal furrow shallow and 

 distinctly defined at sides of glabella. 



Fixed cheeks narrow, slightly convex, and sloping posteriorly 

 downward to an elongate postero-lateral limb ; in front of the pal- 

 pebral lobe the cheeks slope abruptly down to the frontal Hmb; 

 palpebral lobes a little longer than one-third the length of the cepha- 

 lon ; there does not appear to be any definite palpebral ridge ; the 

 elevated rim of the palpebral slope lobe approaches closely to the 

 dorsal furrow, where it is merged into the downward slope of the 

 fixed cheek ; frontal limb short and slightly convex. 



Surface apparently smooth under a strong lens in specimens from 

 some localities, while in others it is minutely punctate. This appears 

 to depend somewhat on the character of the matrix and condition of 

 preservation. 



On the anterior portion of a cast of a specimen of the glabella 

 there is indicated a very short fourth furrow close to the antero- 

 lateral angle ; the same specimen also shows what is the frontal limb 

 5 



