248 MKIM.-TM- VARIATION. [I'AKT 1. 



5 skulls without Imver jaws, and 1 lower jaw without skull; ab- 

 normal- '2. as follows : 



*3GG. A ynung skull having in the upper jaw on the left side 

 i Fu. M! l.i two teeth, l)-th apparently in place of left j^, making 



*3(i7. A specimen having four incisors in the right lower jaw, the 

 1. ft IH in- normal. IVrhaps the two hindmost of the four repre- 

 - nt thi' thud lower incisor of the left side in the way suggested 

 In the dotted lines iii the figure (Fig. 62, II.). B. M., 314, b. 



PIIAI.AM.I I.ID.K : incisors (neglecting "intermediate" teeth of 

 lower jaw) normally ; this seen in 209 skulls of various genera and 

 spec 



3(J8. Fhalanger orlentalis, Solomon Islands : left f as an imperfectly double tooth, 

 Laving two sub-cylindrical crowns and only one root (Fig. 63). The two crowns 



FK;. 63. Phalun'tn- uricntulis. No. 368. 



incisors and canines. The separate figure shews the left i 3 extracted. 



stand in the same transverse plane, the one being internal to the other and rather 

 smaller than it. Lower jaw missing. 13. M., 1936, c. [Two other skulls from same 

 locality normal.] 



369. maculatus, Port Moresby: only tico incisors on each side in the upper jaw. 

 The centrals, ^, of each side, are in place; externally to them there is on each side 

 an alveolus for a tooth, which, judging from the size of the alveolus, was probably F- 

 Immediately behind these alveoli the canines follow on each side. In this case it 

 uiav In- s.iM that the missing teeth are ^ in all probability. Lower jaw normal. 

 B. M., T'.i. :',. :,. H. 



370. Specimen having "in each upper jaw two incisors instead of three," [also has 

 no left /_>! see No. 377]. /<<//'/. 3/u*., 55. JEXTIXK, F. A., Xvti's Lei/d. Jl/i (.-., 1885, 

 vii. p. '.(). Two specimens, Li'ijd. .1/i/x. , .')(') and 61 are without ^ of rij. r bt upper 

 jasv, ibid., p. 111. Specimen in which "five of the upper incisors are wanting [only 

 one " intermediate " tcn.ili in left lower jaw, see No. 377]. Leyd. Mtis., 63, ibi<l., p. yi. 



371. Paeudocliirus forbesi: of this species only a single skull known; it has no 

 upper >2 [and no upper first premolar, see No. 379]. B. M., 1943. THOMAS, 0.. < 'nt. 



!. Hi-it. Mn*., 1H88, p. 183. 



(2) Premolars, and the " fnteriin-il/ute" teeth (in the lower jaw) of 



PHALANOERID^E. 



The evidence here offered relates to the following genera: 

 J'/Hi/niiifcr. Triclinxiiriis, J'xcui/ocliirus, Petauroides, Dactylopsila 

 and rcfinn-ii*. I'.efmv sjieaking of the variations seen, a few 

 words are needed in explanation of the nomenclature adopted. 



