. The Canadian field-naturalist. Natural history. 1918] The Ottawa Naturalist 27 ON THE REMAINS OF A SELACHIAN FROM THE EDMONTON CRETACEOUS OF ALBERTA.* By Lawrence M. Lambe, , Vertebrate Pal/eontologist, Geological Survey of Canada. The subject of the following remarks con- sists of the caudal and hinder abdominal regions of a selachian tentatively referred to the genus Palaeospinax of the family Cestraciontidae. The specimen (field No. 5) is included in the Geological Survey collection of 1915 from the Edmonton formation on Red Deer river, Alberta, and was obtained on the east side of
. The Canadian field-naturalist. Natural history. 1918] The Ottawa Naturalist 27 ON THE REMAINS OF A SELACHIAN FROM THE EDMONTON CRETACEOUS OF ALBERTA.* By Lawrence M. Lambe, , Vertebrate Pal/eontologist, Geological Survey of Canada. The subject of the following remarks con- sists of the caudal and hinder abdominal regions of a selachian tentatively referred to the genus Palaeospinax of the family Cestraciontidae. The specimen (field No. 5) is included in the Geological Survey collection of 1915 from the Edmonton formation on Red Deer river, Alberta, and was obtained on the east side of the river, three miles north of Tolman, at about 350 feet above the river level. Its discovery was made by Mr. George F. Sternberg in charge of the Vertebrate Palaeonto- logical field party working in the beds of the above formation during the season of 1915. These remains of a small shark occur on the It continues forward to near the anterior end of the specimen where it is lost. Above it is clearly in- dicated at intervals in the caudal region and for some distance in advance of it, but is not seen farther forward. The tail occupied about one-half the length of the specimen and was preceded closely by the anal fin of which the outline is clearly shown. At the extreme anterior end of the specimen inferiorly there are obscure indications of the pelvic fins and certain fragments that may be the remains of claspers, but they are too indefinite to allow of a satisfactory conclusion bemg reached as to their nature. INTERIOR X 5 EXTERIOR X 5 INTERIOR X )0 E^^TERIOR XIO. ^~T. Ceniral figure.—Outline of type of Palaeospinax ejuncidus from the Edmonton formation of Alberta. One-half natural size. Upper figures.—Shagreen granules; Interior and exterior surfaces. Five and ten times natural size. Lower figure.—Restoration of three vertebrae from front half of specimen to shew general proportions only. Twice natural size. weathered surface of a thick layer of hard grey sandstone. Ab
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