-L'O MKKISTIC VARIATION. [PART I. 



^ide. ( '. S. M.. lii'S). ,"^5 was observed to be absent in the following : C. 

 lagopus, t'roin Kaintschatka, absent on both sides in two cases 

 ed in same consignment with I normal skulls. B. J/., S8. '2. 20. 

 and |U; another case from Norway. Lcyl. Mux. C. zerda : on left 

 (.'. S. M., (171. C. vulpes : ditto, '1 cases. |5. M., 177, a ami 

 17."), /.. C. viverrinus : on right side. LeyJ. Mus. C. procyonoi- 

 des : ditto. /.-///. .'/">. HKXSEL, I.e., gives the following: C. vulpes: 

 1 12 skulls; ,< al)sent on both sides, 5 cases; on left side, 3 cases. C. 

 lupus : m> absent on left side, 2 cases; on right side, 1 case. 



ICTICYOX AND OTOCYOX. 



* It is remarkable that in each of the two genera Icticyon and 



<>(,,< I/mi, whieh are especially distinguished from Canis by the 

 possession <>t unusual dental formula-, numerical Variation in the 

 T h has been recorded, though the number of skulls of these 

 forms in Museums is very small. The two forms, besides, differ 

 fr<>ni Canis m opposite ways, the one having a tooth less in each 

 jaw \\hile the other has in each jaw a tooth more, so that the 

 pi* -ei ice of extra teeth in the two species is all the more im- 

 portant. 



255, Icticyon venaticus : according to the authorities has p, m^, 

 vix. a nn .lar less than the Dog in each jaw. The following skulls are 

 all that T have seen. The carnassials did not vary appreciably in tin- 

 tlm-r skulls. Kai-li --kull differs from the others, as follows. 



//;. ///'. 15. .M.. 185, a. 

 pi, m, \, IJ. M., 185, I,. 



j>\. ///:. e 1 . s. M., :>:;:i (See FLOWEK, /'. Z. S., 1880, p. 71.) 



25li. Otocyon megalotis [^ /nf<!n<l!i and en for]: the usual formula 

 isy[, />< y. that i-. niir molar more than the Dog in each jaw. It occurs 

 in I >kulls at I!. .M . and in 2 at C. S. M. One specimen has in addi- 



4. __ 4 

 tion an extra molar of good size in each upper jaw, giving m - 



In this case '"' i- enlarged also on both sides. C. S. M., 675 (see Cat. 

 .]/<>. <',,//. >///</.. ifec.). Three specimens having ni mentioned by 

 hoMi/. >;/-./,. nativrf. /'/. /;///,/, 1,^72, p. ~>\. 



B. DnMKSTIC ])o(;s. 



Supernumerary Molars. 



2">7. Dogs. In :H") skulls the following i'S ,- ;lS es occurred, chiefly in 

 large breeds : 



on Lith sides and m 4 on one side, 1 case. 



'" ; on both sides 2 cases. 



in 1 on one side 9 cases. 



' ; and / on one side only 2 cases. 



,,,4 on both sides G cases. 



m 4 on one side only > cases. 

 Ih.N-r.i., .l/o/-/.//. ././/.//,., i>7'.'. \. ]>. 538. 



