61 

 Hemipsalodon grandis, Cope. 



Plate VII, figs. 7 and 8. 



■■a- 



Hemipsalodon grandis, Cope, 1885. The "White River beds of Swift-current river, North 

 West Territory, American Naturalist, vol. XIX, p. 163; and Geol. and Nat. Hist. Survey 

 of Canada, vol. I, new series, part C, 1885, appendix I, p. 80. 



Jlemipsalodon grandis, Cope, 1891. The species from the Oligocene or Lower Miocene beds 

 of the Cypress hills ; Geol. Survey of Canada, Contr. to Can. Pala?ont., vol. Ill (quarto), 

 pt. I, p. 6, pi. II. 



The material on which this genus and species were established consists of a right mandi- 

 bular ramus, a complete and well preserved right femur, and a left femur, of slightly smaller 

 size, from which the distal end is missing. Cope's full description, with figures, is given in 

 part I of this volume. 



Hemipsalodon is the representative, in North America, of the European Upper Eocene 

 Pterodon. It differs from the latter in the form of the enlarged posterior lower true molar. 



Among the characters of H. grandis, which is the largest of all known creodonts, are to 

 be noticed the great depth of the mandible,the length of the symphysis, and the immense size 

 of the canine, which so crowds the incisors that the second of these teeth is behind the other 

 two. The symphysis reaches back to a point nearly below the middle of the fourth premolar. 



Through an error, in printing probably, the length of the premolar series is given, in the 

 description on p. 6, of part I, of this volume, as 108 mm. This measurement should read 

 87 mm. 



In the 1904 collection from the typical locality is a large canine tooth, plate VII, figs. 7 

 and 8, that apparently belongs to this species. Its dimensions, at the point of greatest thick, 

 ness, agree with those of the canine in the type specimen. In this separate tooth the upper 

 part of the crown is broken oft', but the whole of the root is preserved, giving a length to the 

 specimen of 111 mm., with an estimated total length to the tooth, when perfect, of about 

 129 mm. 



Cykodictis lippincottianus (Cope). 



Plate VII, figs. 9-14. 



There are in the collection of 1904 four teeth that apparently belong to this species, of 

 which Cope was uncertain as to whether it was distinct from, or only a large variety of G. 

 gregarius (Cope), one of the commonest of the White River (Oligocene) carnivores described 

 from Colorado, Nebraska and South Dakota. 



The teeth from the Cypress hills were obtained separately, and agree in size most closely 

 with those described by Cope under the name Galecynus lippincottianus (see Cope's Tertiary 

 Vertebrata, vol. Ill, book I, 1884, p. 919, pi. LXVIIa). They are, a left lower third pre- 

 molar, a left lower fourth premolar, and a right lower first molar of which the anterior cusp 

 is missing. Another tooth, slightly damaged, from the left side, is apparently a lower fourth 

 premolar. 



