214 MERISTIC VARIATION. [part i. 



5 5 



234. Dog : large skull, having^ =--, all the normal teeth being 



o — o 



in place, of proper form and size, standing evenly without crowding. 

 O. M, 1780. 



235. Dogs. In 3 t5 skulls were 1 1 cases of supernumerary premolar in 

 the upper jaw. viz. 



on both sides, 1 case, 

 on right side, 7 cases, 

 on left side, 3 cases. 



These were all cases described by Hensel as instances of the presence 

 of "p b " of his notation, i.e. a tooth between p ] and canine. Hensel, 

 Morph. Jahrb.f 1879, v. p. 546. Out of 650 skulls, including Hensel's 

 ."U">, 18 had two anterior premolars as described, on both sides in upjDer 

 jaw. Nehring, Sitzb. naturf. Fr. BerL, 1882, p. 6Q. 



English Spaniel: outside and anterior to right & is a worn stump, probably of 

 an extra tooth (?). B. M., KJG, j. 



236. Deerhound : tiro alveoli where p~i should be; probably two distinct teeth stood 

 here, but it is possible that the two alveoli were for distinct roots of a single tooth. 

 C. M., 991, B. 



Division of r p~. 



237. Sledge-dog, Greenland : all teeth normal except left upper 

 p 2 . This tooth normally of course has two roots. Here it is 

 represented by two distinct teeth, each having one root. The 

 anterior has a fairly sharp cusp, but the posterior has a rounded 

 crown. The teeth are in perfectly good condition and do not 

 look worn. They are separated from each other by a considerable 

 diastema. It appears clear that instead of the normal p* } two 

 distinct teeth have been formed. 0. M., 1787 (compare C. 

 viverrinus, No. 227). 



Absence of Premolars. 



A. Wild Canid.e. 



236. C corsac : fi absent on both sides without trace. Giebel, 

 Jirouits Kl. u. Orel., Mamm. p. 196, Xote. 



239. c. occidentalis : p absent on both sides. C. S. M., 629. 



240. C. vulpes : in 142 skulls : 



P^ absent from both sides 1 case, 

 do. „ „ left „ 1 „ 

 do. „ ,, right „ 1 ,, 

 p 1 » „ both „ 1 „ 



do. „ „ left „ 2 „ 



do. „ ,, right „ 2 „ 



Hensel, Morph. Jahrb., 1879, p. 548. A doubtful case of absence of 

 left p. B. M., 175, c. 



