56 



Sbkpulitbs dissolutus. (N. sp.) 



Description. — This species is usually from 2 to 3 inches in length, and 

 from li to 3 lines in width at the larger extremity. The form is elongate, 

 slender, taperiag to an acute pomt, generally pressed quite flat, often 

 showing on each side an elevated wire-like margin, running the whole 

 length, as if two of the opposite sides of the tube were thicker and stronger 

 than the other two. In such specimens there is an irregular depression 

 ilong the middle, between the two thickened margins. Colour, jet black, 

 shining ; surface apparently smooth. 



The best preserved specimen that I have seen is 2i inches in length, and 

 If lines in width at the larger extremity. Another specimen with a por- 

 tion of the smaller extremity broken off is 1% inches in length ; 3i lines 

 wide at the larger and 1 hne wide at the smaller (broken) extremity. 

 This specimen, when perfect, must have been a little more than three 

 inches in length. 



This species is often found in slender, hair-hke, jet-black, shining frag- 

 ments, consisting of the separated thickened sides of the tube. No per- 

 fectly entire specimens have been collected. 



Locality and Formation. — Montreal, Ottawa, Lachine, Naquareau. 

 Trenton limestone. 



Collectors. — Sir W. E. Logan, J. Eichardson, E. BiUings. 



Bathyurxjs Smithii. (N. sp.) 



Description. — The specimen upon which this species is founded consists 

 of the glabella and the greater part of the fixed cheeks of a minute trilo- 

 bite, discovered by Mr. J. P. Smith, of Toronto, two or three years ago, 

 in the neighborhood of Peterborough, CW. The glabella is obtusely conical, 

 strongly convex, most elevated in the middle, separated from the cheeks 

 by a deep dorsal furrow, which runs aU round ; front margm obtusely 

 rounded ; sides gently convex ; neck furrow extending all across. Cheeks 

 moderately tumid. Eyes at about the mid-length of the head, and distant 

 about half the width of the glabella from the dor saf furrow. 

 ^ Length of glabella, 1 hne ; width of the same, a little more than half a 

 Ime ; length of eye, apparently about i of a line. 



On account of the rather great convexity of the glabella, this species 

 resembles a Menocephalus. I refer it to Bathyurus, provisionally. 



Locality and #ormafo'o?i.— Peterborough. Black River limestone. 



Qollector.—Mx. J. E. Smith. 



