200 



DiKELOCEPHALUS PAUPER. (N. Sp.) 



Description. — Glabella small, truncato-conical, narrowed towards the 

 front, moderately convex, the outline on a side view nearly straight, 

 or gently convex for two-thirds the length, then abruptly curved down to 

 the front ; sides nearly straight, converging forwards ; front gently con- 

 vex, or nearly straight in the middle ; anterior angles narrowly rounded ; 

 neck furrow extending all across, the extremities turned forwards, but 

 scarcely touching the dorsal furrow ; anterior furrows represented by two 

 small obhque pits on each side ; neck segment wide, a little turned for- 

 wards at the ends. The margin of the head in front of the glabella, is 

 in width about one-sixth of the length of the glabella, and has a thickened 

 rim or border. 



Length of largest glabella seen 3 J lines ; width at the neck segment 

 8 lines ; width at the front 2i lines ; width of the margin, in front of the 

 glabella | of a line. 



This species is of the same type with D. Sesostris, but differs from it 

 in being always smaller, in having the glabella narrowed towards the front, 

 or truncato-conical instead of oblong, and in the form of the glabellar 

 furrows which do not extend across, but are small but distinct pits. It is 

 more common than Z>. Sesostris. 



Locality and Formation. — Point L^vis ; limestone. No. 1 ; Quebec 

 group. 



Collectors. — Sir W. E. Logan, T. Devine, Esq., J. Richardson, R. 

 Bell. 



Genus Loganellus. (Devine.) 



Generic Characters. — The trilobites, for which this genus was proposed, 

 are ovate, with a conical or sub-cylindrical glabella, having two or three 

 more or less distinctly marked, usually oblique furrows on each side ; 

 facial suture behind the eye curving outwards, and cutting the posterior 

 margin inside of the angle ; in front of the eye, also curving more or 

 less outward to the front margin. Thorax broad ; side lobes flat ; pleurae 

 about twelve ; pleural groove running along the middle, nearly to the 

 extremities. Pygidium with a well-defined axis ; side lobes depressed, 

 and with from four to six riba. 



The genus is allied to both Olenus and Bikelocephalus. It differs 

 from the former in being composed of larger species, and in having the 

 facial suture curving outwards in front of the eye. Angelin has described 

 the Swedish species of Olenus under eight sub-genera, and this might 



