22 



The striae have their edges serrated with small conical tubercles, of which 

 there are six or seven in the length of one line. Length of the specimen 

 19 lines ; width at the larger extremity 18 lines ; thickness 8 Unes ; width 

 of the smaller extremity 7 hnes ; thickness 4^^ lines. Near the smaller 

 extremity there are nine transverse ridges and grooves, in two lines, but 

 at the larger there are twelve in the same space. Macasty Bay ; H. R. 

 T. C. Weston. 



Genus Pterotheca, Salter. 



P. TRANSVERSA, Emmons. Macasty Bay ; H. R. Also Gamache Bay ; 

 Div. 1, A. G. 



CEPHALOPODA. 



Genus Orthoceras, Breynius. 



0. ANTICOSTIENSE, B., Rep. 1857, p. 316. — Charleton Point and various 

 localities at the westerly end of the Island ; H. R. This species also occurs 

 abundantly at Lake St. John on the River Saguenay ; H. R. 



0. FORMOSUM, B., op. cit., p. 317. — English Head; H. R. Also at 

 Junction Cliff; Div. 1, A. G., and on the island of Montreal in the Tren- 

 ton limestone. 



0. xiPHiAS, B., op. cit., p. 318. — CHffs east of English E[ead ; H. R. 

 Also at the City of Ottawa in the Trenton hmestone. 



0. CALTEATUM, B., op. cit., p. 318. — English Head ; H. R. 



0. FULGDR.= 0. propm^Mwm, B., op. cit., p. 320. — I have ascertained 

 that Eichwald had described a species under the name of 0. propinquum 

 previously to 1857, and therefore, it is now proposed to name this as above. 

 Charleton Point ; H. R. 



0. Lyelli, B., op. cit., p. 320. — Cliff east of Salmon River ; H. R. 



0. Sedgwicki, B., op. cit., p. 320. — West-end; H. R. Also at 

 Gamache Bay ; Div. 1, A. G. 



0. Crocus.^ 0. perannulatum, B., op. cit., p. 319. — This latter name 

 was proposed for an Orthoceras in 1843, by Portlock. I therefore beg to 

 make the above alteration. West-end ; H. R. 



0. FERUM, n. sp. — Annulated, apparently tapering at the rate of one 

 and a-half lines to the inch ; section circular or nearly so ; septa distant 

 from each other about one-third of the diameter. The annulations ' are 

 wide, gently convex, separated from each other by concave spaces equal 

 to themselves (to the annulations) in width. The distance between the 



