218 



MERISTIC VARIATION. 



[part I. 



noticeable on both sides, and this tooth is present as a large tooth 

 with apparently three roots. In the lower jaw there is no extra 

 tooth, but the molars are considerably larger than those of a 



Fig. -13. Canis azarce. I. and II. Right upper and lower jaws of the specimen 

 described in No. 248, shewing the extra upper molar and the correlated enlarge- 

 ment of w 2 and m-\ III. and IV. are taken from a normal specimen of slightly 

 larger size. C, carnassial teeth. 



This figure was kindly drawn for me by Mr J. J. Lister. 



normal specimen (Fig. 43). In the figure, side by side with the 

 teeth of the abnormal form, are shewn the teeth of a normal skull 

 which was slightly larger than the abnormal one, for comparison. 

 Leyden Mus. ' 



250. C. magellanicus : specimen having Ji? on both sides. B. M., 46. 

 11. 3. 9 (mentioned by Huxley, I. c). 

 *251. C. cancrivorus. The only skulls of this species seen by me are 

 those in B. M. Of these one skull with lower jaw, one skull without 

 lower jaw, and one lower jaw without skull, have numerically the 

 normal dentition of Canis, but of these, one has right m;* much larger 

 than corresponding left tooth. The following were abnormal : small 

 tubercular m~+ on both sides, upper series normal, B. M., 1033, b, and 

 also B. M., 1033, c, (Fig. 44, II.) mentioned by Huxley, I. c. 

 252. Specimen having upper series and left lower series normal. On 

 inner side of right m? and as it were growing out from this tooth is a 



1 This is no doubt the skull described by van der Hoeven, Verh. k. Ak. Wet., 

 Aim-t., iii. 1856, PI. See Huxley, P. Z. S., 1880, p. 268. 



