210 MERISTIC VARIATION. [part I. 



I. Variation in Incisors and Canines. 



A. Wild Caxid^e. 



No case of extra incisor known to me. 

 Two cases of absent incisor, viz. 



210. [Canis] Vulpes pennsylvanica, Brit. Columbia, having 

 ' \ o ' a PP aren tly i l has nut been present on either side. B. M., 



1402, b. 



211. Canis vulpes: only 5 incisors in lower jaw, with no trace 

 of alveolus for the sixth. Schaff, E., Zool, Gart, 1887, xxviil 

 p. 270. 



B. Dogs. 



212. Dog (resembling Bloodhound) : four incisors on each side in 

 upper jaw. The externals, i 3 , normal, but no evidence as to which 

 of the other teeth supernumerary. Leyclen Mus. 



213. Thibetan Mastiff, Nepal: sockets for four teeth on each side in 

 pmx. Teeth all gone. Alveoli of two sides nearly symmetrical. In 

 absence of the teeth it cannot be positively stated that this is not a case 

 of persistent milk-teeth, but this seemed unlikely. B. M., 166, g. 



214. Mastiff: four teeth on each side in front of canines; from form of 

 teeth probably case of persistent milk-canines. Lower jaw gone. O. M., 

 1749. 



215. Dog : on right, sockets for three teeth in addition to ? 3 which is in 

 place. These three sockets all smaller than the normal ones, and socket 

 for upper right canine also slightly reduced in size. Odont. Soc. Mus. 



216. Dog : small skull in my possession, has in place of right & two 

 alveoli, both at the same level, divided by a thin bony septum, the one 

 internal to the other: left &_ is in place and normal: lower jaw gone. 



217. Among 345 Dogs' skulls four had extra upper incisor on one 

 side, and one skull had perfectly formed fourth upper incisor 

 on both sides. This tooth smaller than third incisor. Hensel, 

 I. c, p. 534. Several cases of 7 or 8 incisors in upper jaw, teeth 

 being usually asymmetrical. Nehring, Sitzb. not. Fr. BerL, 1882, 

 p. 67. 



218 In lower jaw such cases much rarer. Supernum. lower in- 

 cisor on one side, one case [? in 650 skulls], Nehring, ibid. ; also 

 a Dog (cJiien chinois-japonais), 4 incisors in each lower jaw. 

 Magitot, An. syst. dent, p. 81. 



Case of divided incisor. 



219. Bulldog : right i~ with very wide crown; main cusp partially 

 bifid, as if intermediate between single and double condition. 

 Morph. Lab. Cambridge. 



Similar case kindly sent to me by Prof. G. B. Howes. 



