The Canadian naturalist and quarterly journal of science . on themethods of those who have preceded him. It may, like hisviews on the Quebec group, have the merit of simplicity, but wemust not allow ourselves to be influenced overmuch by the ad-vantages of this peculiarity. Instead of disparagement, suchefforts as those of Dr. Hunt merit our warmest thanks, and wemust wish him every success in his efforts to determine the valueof mineral fossils in crystalline rocks. As he himself very fitlyremarks, In no other way did William Smith prove, in Great Britain, the value of organic fossils, and th
The Canadian naturalist and quarterly journal of science . on themethods of those who have preceded him. It may, like hisviews on the Quebec group, have the merit of simplicity, but wemust not allow ourselves to be influenced overmuch by the ad-vantages of this peculiarity. Instead of disparagement, suchefforts as those of Dr. Hunt merit our warmest thanks, and wemust wish him every success in his efforts to determine the valueof mineral fossils in crystalline rocks. As he himself very fitlyremarks, In no other way did William Smith prove, in Great Britain, the value of organic fossils, and thus lay the foundations of palaeontological geology. (Read before the Natural History Society of Montreal, 28th April, 1879.) No. 2.] DAWSON—A CANADIAN PTERYGOTUS. 103 A CANADIAN PTERYGOTUS. (^Pterygotus Canadensis.) Among some specimens kindly presented to the museum ofthe University in the winter of 1877-8, by Grant ofHamilton, was a slab of Niagara limestone holding a well-pre-served ectognath or mandible of a large Pterygotus. (Fig. 1.). Fig. 1. Ectognath of Pterygotus Canadenftif, natural size. (The shadedportions represent the slaty character of the surface.) c. teeth enlarged. As the species seemed to be new, and I could not learn thatanything similar had been found in rocks of this age in Canada,a notice of it was communicated to the Natural History Societyof Montreal at its meeting of April 28, 1879, and was reportedas follows in the Daily Witness of the 30th : A very remarkable discovery recently made in the Niagaralimestone is that of some fragments of a gigantic Crustacean ofthe genus Pterygotus, comparable in size with the great PterygotusAnglicus of the Devonian of Scotland, though of much greatergeological age. Some small species of Pterygotus have been de-scribed by Hall from the Waterlime formation of New York, anda fragment of an undescribed species has been found by the samepalaeontologist in the Clinton ; but the present is, so far as known,the
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