L'04 MKKISTIC VARIATION. [PART I. 



lint whether the nbliijuu tooth, or the tooth between it and 

 tin- ri^ht /', should I).- rather consiflered supernumerary cannot 

 be deel.uvd \vith certainty. Probably this is one of the cases, of 

 \\hieh more will be said hereafter, in which both teeth replace the 

 normally single i l . C. S. M. 21, A. 



txtru ti'ftli. A lower jaw in the Museum of the Odontological 



. ty "hav in;.- two supernumerary teeth embedded in the bone beneath the coro- 

 ; -moid IK. tdi. Originally only a small nodule of enamel was 



le nn tli.. inner surface nf the right ascending ramus, just external to the upper 

 extremity of tlif inf.-ri.ir dental canal. On cutting away the bone this nodule was 

 fiMiii'l i } a portion of a supernumerary tooth having a conical crown and a 



le taper. Lying above it, another supernumerary tooth was discovered, 



of which there had previously been no sign whatever. This was likewise exposed 

 iy removing the superjarent bone, and found to be a larger tooth with a conical 



.11 iiii'l three Ion;,- narrow roots. The teeth were lying parallel to each other, 

 with their crown- pointing upwards and backwards, so that they could hardly under 

 uny ( in iuii-[:tiK e- h;i\r been erupted in the alveolar arch." Trans. Odont. Soc., 

 L887, nx. p. -'.;. ;ig. 



Sp. einien having fragment of a tooth imbedded in bone between left lower canine 

 and p 1 ; perhaps a fragment of a milk-tooth P.M., A, 500. 



[Two specimen-; in the stores of the P.M. shew great irregularities in the 

 arrangement of the teeth; but in both cases so many teeth had been lost during 

 life that u satisfactory description of the abnormalities cannot now be given.] 



Hylobates (Cibbons). 



Normal specimens seen, 51. No abnormal case known to me. 



OLD \Ynuu> MONKKVS other than Anthropoid Apes. 



Of tin- in 'in T;I tii'iiiitujn'tJieciis, Colobus, Nasalis, Cercopithecus, 



Oercocebus, Mm-ur,/* arid Cynocephalus ; 41!) normal specimens 

 examined. Only two had definite supernumerary teeth, but in one 

 >ther case it was possible that extra molars had been present. 



N >/<//< unwary molars. 



Cynocephalus porcarius, having large extra molar behind 

 and in series in each upper jaw. The two teeth are of the same 

 pattern precisely. I n lower jaw there is on each side a large 

 behind /// ', but there is no tooth in it. O. M., 2011, b. 



1!M). Macacus rhesus, old male, having a fourth molar in place in 

 ri^ht luin-r jaw. The tooth does not stand up fully from the 

 bone. On the same side in the iij>/n'r jaw there is also a fourth 

 molar, but was entirely enclosed in bone and was only found by 

 eiittinir a\\av the side of the maxilla bv way of exploration. B.M., 

 30, c. 



191. Macacus radlatus, basing small and fairly definite depression behind > :t in 

 aeli jaw. These depressions seem to tie peihaps the alveoli of teeth but it cannot 

 be p" iti'.eU atated that extra molars have been present. C.S.M., 145. 



I|i2. .tl-iinriiiiil (irr,n\<ii-M<-nt. Only one case of considerable irregularity of arrange- 

 ment seen, vi/.., Ccrcopitbccus lalandii (C. S. M. 1 l.li, case in which lower canines 

 are recurved and pass l>,-himl the upper ones, bee Cut. Jl/x. Coll. S 



