(hi ufir J/eleroct'ni from Dulch Siir (inineii. li'J.J 



(lisljiini, York>>. This Hpeciincn is also in the MaiichcstiT 

 Museum, and the hiwcr jaws have the usual six treih. 



Coiupaiini; a uuuihcr of five-(o(»thiHl jaws with a like 

 mini her of six-toothctl jaws, there sionj.s to he a geiuTal 

 tendency for all the teeth in the latter form to bo soniowhat 

 smaller, as will be seen by the table on p. 294. 



It niij;ht here be mentioned thut there is nothing in tho 

 (ilastonbury bones and lower jaws to indicate thut more tlian 

 the one species is j)iesent, viz. llo$ lon</i/rons. 



llnfortunately in n^ost iinds the exact relation between the 

 upper and lower teeth cannot usually bo ascertained, owing 

 to the scattered and imperfect condition oi' the remains. It 

 might be of interest, tiierefore, to {)oint out that the asso- 

 ciutcil upper and lower jaws were found of the llaveibraek 

 specimen, and these sho\v the six teeth of the upper jaw 

 exactly opposed to the five lower teeth; so that, if [^ITii were 

 present, it would be quite functionless. 



The whole feature of the loss of j.m.a in some oxen jaws 

 seems to me to be a clear case of degeneration gradually 

 brought about by disuse of that particular tooth. 



Tiiough the absence of ,„„. ^ in ox jaws has been knqwn for 

 some time, tiie absence of this tooth from tlie jaws of ^lieep 

 does not appear to have been noted hitherto. On sorting the 

 sheep-remains from Qlastonbury, however, I came acrqss a 

 fair percentage of lower jaws with only two premolars and 

 three molars present in place of the usual six teeth. 



This feature, as in the ox, may be likewise due to disuse, 

 probably through change of food or habit under domestication. 



As a further instance of j^;S77;j being missing, I might men- 

 tion that both lower jaws of a specimen of Capra ibi'.c in the 

 Manchester Mi;seum possess only five teeth. 



XXIV. — Sew Sj>ecifs of Iltterocerafrom Dnti;h yew (juineu. 

 By J. J. Joici:v, b\L..S., F.E.S., and G. Talbot, F.E.S. 



[Plate XII.] 



The following species were all collected by Messrs. A. C. 

 and F. Pratt in the Arfak Mountains, Dutch New Guinea, 

 and the types are in the collection of floicey. We are 

 indebted to the Hon. W. Uothschild and iSir Geo. II. Kenriek 

 for the opportunity atfordeil of comparing sjieciniens in their 

 collections. 



2.)* 



