NO. 5 CAMBRIAN TRILOBITES 319 



Formation and locality. — Middle Cambrian: (i52d) Calcareous 

 shales ; Cambrian section of Coulouma, " Montagne Noire," Herault, 

 France. 



CORYNEXOCHUS MINOR (Walcott) 



Plate 55, hgs. 6, 6a-d 



Karlia minor Walcott, 1889, Proc. U. S. Nat. Mus. for 1888, Vol. 11, p. 445. 



(Description of species.) 

 Karlia minor Walcott, 1916, Smithsonian Misc. Coll., Vol. 64, No. 3, p. 224, 

 pi. 36, figs. 7, ja-c. (Description and illustration of species.) 



The description of this species may be found on page 224 of this 

 volume. It is illustrated in this paper in order to afford direct com- 

 parison with the other species referred to Corynexochus. 



Formation and locality. — Middle Cambrian: (i) Manuels forma- 

 tion ; Manuels Brook, Conception Bay, Newfoundland. 



CORYNEXOCHUS SENECTUS (Billings) 



Plate 55, figs. 7, /a-c; plate 56, figs, i, la-g 



Bathyiirus senecius Billings, 1861, Geol. Surv., Canada, Pal. Foss., Vol. I, 

 p. 15, text figs. 19, 20. (Describes and illustrates a cranidium and asso- 

 ciated pygidium.) 



Bathyurus scnectus Billings, 1862, Geol. Vermont, Vol. 2, p. 953, text figs. 

 359> 360. (Same as above.) 



Bathyurus senectus Billings, 1862, Rept. Economic Geol. Vermont, Hager, 

 p. 22s, text figs. 359, 360. (Same as above.) 



Bathyurus senectus Billings, 1863, Geol. Canada, Geol. Surv., Canada, p. 

 286, text fig. 298 (fig. only). (Same figures as above.) 



Bathyuriscus senectus MATTHEVk^, 1897, Trans. Royal Soc. Canada, 2d ser., 

 Vol. 3, Sec. 4, p. 196, pi. 4, fig. 4. (Describes and illustrates the supposed 

 type specimen and refers the species to Bathyuriscus and compares it 

 with Paradoxidcs.) 



Original description. — " Glabella subcylindrical, clavate, strongly 

 convex, one-fourth wider at the front margin than at the neck seg- 

 ment, sides nearly straight, front obtusely rounded and presenting a 

 strong convex elevation, neck furrow extending all across, three pairs 

 of glabella furrows represented by small but distinct and obtuse 

 indentations in the sides. Fixed cheeks rather strongly convex. 

 Eyes of moderate size, semicircular ; a line drawn across the head at 

 about one-third the length of the glabella from behind would pass 

 through them, and they are distant from the side of the glabella about 

 the width of the neck segment. The front of the head is surrounded 



