NO. 5 CAMBRIAN TRILOBITES 323 



Formation and locality. — Lower Cambrian : Billings gives I'Anse 

 au Loup on the north shore of the Straits of Belle Isle (Labrador) 

 as the type locality. 



Collections made for the United States National Museum contain 

 specimens of the species from five localities, as follows : 



(41 1) Bonne Bay, east shore of East Arm, west coast of New- 

 foundland ; (2 o) limestone boulders in conglomerate on shore line 

 at east entrance to harbor at Bic, Rimouski County, Quebec, both in 

 Canada. 



(49W) Limestone in railroad cut, 0.25 mile (0.4 km.) south of 

 Emigsville, York County, Pennsylvania. 



(6id) Mount Whyte formation ; southwest slope of Mount Shaffer 

 on Canyon side, on trail to Lake McArthur, 8.5 miles (13.6 km.) south 

 of Hector Station, on Canadian Pacific Railroad, British Columbia, 

 Canada. 



Also from (i6g) : Hard arenaceous shales; Paymaster Mining 

 Camp, 0.25 mile (0.4 km.) west of Esmeralda, Esmeralda County, 

 Nevada. 



CORYNEXOCHUS SPINULOSUS Angelin 

 Plate 55, figs. I, la-b 

 Corynexochiis spinulosus Angelin [1852, 1854], 1878, Pal. Scandinavica, 3d 

 ed., Holmiae, p. 59, pi. 2>2„ figs. 9, ii ?. (Described and figured as a new 

 species.) 

 Corynexochus spinulosus Gronwall, 1902, Danmarks Geol. Unders., Vol. 2, 

 No. 13, p. 139, pi. 4, figs. 2>o-b, 4. (Describes and illustrates type speci- 

 mens.) 



Dr. Karl A. Gronwall studied the type specimens of this species 

 which are in the Museum at Stockholm, and in substance wrote the 

 following description : 



" Head without margin, anteriorly strongly curved. Length 

 greater than breadth. Front narrow or club-form, delimited with 

 deep, similar dorsal grooves. Lateral grooves, 3 pairs, short and flat ; 

 the most posterior pair of grooves are directed backward, nearly 

 enclosing a pair of basal lobes. Eyes small, cheeks narrow, occipital 

 ring moderately broad with a spine. The surface of the cranidium, 

 with densely impressed fine points. 



" Considering the pygidial shield, I am in great uncertainty. Ange- 

 lin illustrates one with spines in margin, which does not show much 

 resemblance to that of C. bornholmiensis. Professor Holm told me 

 that he had not succeeded in finding a pygidium for C. spinulosus in 

 the Stockholm Museum. Among the heads there was, however, a 



