2-2-2 MKKI.STIC VARIATION. [PART i. 



l.robiibly both of the same strain, C. M. O'U, F and G; and Fox Terrier, C. M.. 

 .nl. .' .ut on left side, 2 cases. Irish Wolf-dog, B. M. *_>. 11. 11. 1; Fox 



', A \ ,,,3 absent on right side, 1 case, Bloodhound, B. M., HJi'-. f. 

 ibtful cases. 



Inca dogs : for evidence as to absence of molars, see No. 244-. 



FELID.E. 



Th.' follow ing evidence relates to the genera Felis and Cyn- 

 celurus. 'I'll" usual formula is ,, cj, ;?f, w{. Of wild species, 

 27 s - adult skulls having no extra teeth were seen, and s eases 

 ..f extra teeth (nearly 3 per cent.): of domestic Cats, 35 adults 

 \\ithout, and 3 cases with extra teeth (so far, about i) per cent.). 

 A- in Canida- su in Felidw, there is a remarkable group of cases 

 ot' \ariation in the anterior premolars. In the normal a small 

 anterior pivmolar stands in the upper jaw, and commonly it is 

 one-rooted, sometimes two-rooted (cases given); but there is no 

 <mall anterior juvniolar in the lower jaw. 



Cases ot variation consisting in the presence of tw<> small 

 pr.-molar- ab..ve are common 1 , just as there are often two small 

 anterior preniolai> in the Dog. There are besides a few cases 

 nf tin- pre-enee nf a small anterior premolar in the lower jaw, 

 Inn they are rather rare, and curiously enough there seems to 

 he IK. case of the e, .1 1 icideuce of these two variations in the same 

 3 kull. 



A- already Dialed, in describing cases, the small anterior pre- 

 inolar in the upper jaw will be here spoken of as /^, though no 

 suggestion that it is the hoiuologue of the Dog's ^ is meant. 



In a few speeies /> l is UK.-) commonly absent (cases given). 

 There are some rurious cases ,,f i/n^h'n/tes of large premolars (Cat) 

 and one of tl'ijJ/i'iite cmiim- (Tigei 1 ), also a few of supernumerary 

 molar. TliMii-h BO small, and liitin- mi no tuoth of the lower 

 jav. - nearly always in place even in old skulls (HEXSEL). 



Vnrititi',11 in I in-ixnrs. 



NI. quite satisfactory case "f nunicrical variation in incisors of Felicia known to 

 inc. The t'olluwiii -lii.iiM liDWi-vcr l.c i.'.ciitiniicil. 



2\\:\. P. lynx: t\\u c\ti:i t.-dh in ]>rcni;ixill;c. lli^'lit incisors normal; sockets f..r let't 

 iiiH-ui'- iHirniiil. Ont^i.lc 1,-tt and dose to canine is an extra tooth of good size, 

 and in -aim- place on ri^ht i- a .-ocket for a similar tooth. Since they are in pre- 

 ma\ill:c the-e ti'cth ale yj/-ii///i/// nut jicrsisti-iit milk-canines. Lower canines Lite in 

 fri,t of th. tli. 11. M.. 1 1 .".C.. a. 



absent. 



F. pardalis: '' and ,i ul.seiit on left side. A- i.-ards the lower jaw the tooth 

 ;;//// have t.eeii jircx-nt. and I., en lost, but left /' has probably never been present. 

 It is e-|.i cially notable that let't '' is larger than ri^-ht ^, but there is no indication 

 that i' 1 is coni|.ounded \\itli it. II. M., lOt'.s, ,/. 



F. chate [? = ;K/-(/I//I>-|: doulitful if i' 1 has been present on either side. B. M., 



.'..". r_'. _".. ITS. 



->i;- Cync-rlurus jubatus : no trace of ik'ht P; same skull has no )^; lower jaw 



iioimal. 1'.. M., 1 :'">./'. 



1 i ission of such cases see Chapter x. Section 5. 



