214 MERISTIC VARIATION. [part i. 



5 5 



234. Dog: large skull, having p~ -, all the normal teeth being 



o — o 



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

 O. M., 1780. 



235. Dogs. In 345 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 5 " of his notation, i.e. a tooth between p x and canine. Hensel, 

 Morph. Jahrb., 1879, v. p. 516. Out of 650 skulls, including Hensel's 

 345, 18 had two anterior premolars as described, on both sides in upper 

 jaw. Nehring, Sitzb. naturf. Fr. Berl., 1882, p. 66. 



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

 an extra tooth ('?). B. M., 166, j. 



236. Deerhound : two alveoli where y^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 p 2 . 



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. O. M., 1787 (compare C. 

 viverrinus, No. 227). 



Absence of Premolars. 

 A. Wild Canid.e. 



238. C. corsac : p l absent on both sides without trace. Giebel, 

 Bronn's Kl. u. Orel., Mamm. p. 196, Note. 



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



240. C. vulpes : in 112 skulls : 



p 1 absent from both sides 1 case, 



Hensel, Morph. Jdltrb., 1879, p. 518. A doubtful case of absence of 

 left pi. B. M., 175, c. 



