203 



" Locality. — Point Levis ; band of limestone A 3, referred to in Sir W. 

 E. Logan's ' Remarks on the Fauna of the Quebec group of rocks and 

 the Primordial Zone of Canada,' addressed to Mr. J. Barrande, dated 

 Montreal, 31st December, 1860, and printed in the Canada Naturalist 

 and Geologist of that year. ' I have in the mean time referred this 

 species to Olenus, although at one time inclined to refer it to Cononcepha- 

 lites QSub-genus). Should it be found necessary to institute an interme- 

 diate generic form, whatever place naturalists may assign it in the 

 animal kingdom, I propose that it be named Z/oganellus Quebecensis.^ 



" Dedicated to Sir W. E. Logan, F.R.S., &c., &c., Director of the 

 Canadian Geological Survey." 



Menocephalus Salteri. (Devine.) 



Mbnocephalus Salteri. (Devine.) Can. Nat. and Geo., vol. viii, p. 210, June, 1863. 



Fig 187. — Menocephalus Salteri. (Devine.) A specimen perfect with the exception of 

 the moveable cheeks. Enlarged two diameters. 



Description. — " Form oblong-oval. Entire length three lines, and 

 width at posterior margin of the head one and one-fifth line ; front of head 

 and posterior margin of tail, broadly rounded; sides parallel. 



" Head semi- circular, two-fifths of the entire length, strongly convex, 

 posterior margin marked by a well-defined furrow, which curves round the 

 lateral angles anteriorly. 



" Glabella ovate, narrow at the base, and broadly rounded in front, 

 extending anteriorly beyond the fixed cheeks, prominently convex with a 

 very narrow flat rim forming an arch round the front. 



" Thoracic segments six or seven, flat, lying close to each other, with a 

 broad deep groove extending outwards to the tips, which are bent down. 



" Axis — tapering regularly from the front of the head to the posterior 

 margin of the tail, convex, as wide as the pleurse in front and less poste- 

 riorly ; the rings of the axis run into the grooves of the pleurae, marked 

 by a deep grove. 



" Tail semi-circular, the lateral lobes marked by two or three ribs with 

 a deep groove as in the pleurae, owing to which and the smallness of the 



