118 



PROF. W. BOYD DAWKINS OX A PLIOCENE [May I903. 



of the crown, connecting the outer angle of the one ridge with the 

 inner of the succeeding ridge. This tooth is only slightly worn on 

 the surface of the two anterior ridges. The two fangs are imper- 

 fectly developed. 



The second specimen (PL X, fig. 2) shows the alternate distribution 

 of the cusps of the ridges in an older tooth, in which the enamel is 

 worn almost down to the gums. It has been implanted in the jaw 

 by two divergent short fangs, and has apparently been vertically 

 succeeded by a premolar. These characters are reproduced in two 

 other specimens worn down to the gums. 



The lower milk-molars from Doveholes sufficiently perfect to be 

 determined are 4 in number. The two-ridged milk-molar 2 is 

 too imperfect to be figured. It consists of portions of the front 

 talon and front ridge, and of the hind ridge supported by a long 

 fang. 



The next, or the penultimate lower milk-molar 3, has not yet 

 been found at Doveholes. It is in the Manchester Museum, Owens 

 College, and is reproduced here (PI. IX, fig. 5) because it has not 

 been figured before, and because it parsed through the hands of 

 Dr. Falconer. It consists of three ridges composed of diagonal cusps 

 and anterior and posterior talons. It came from the Norfolk Crag, 

 and was given to me by the Rev. S. W. King, of Saxlingham. 



Three worn crowns represent milk-molar 4. The most perfect of 

 these has the usual characteristic pattern and ridge-formula. The 

 figured specimen was discovered by Master Hick (PI. X, fig. 3). It 

 is distinguished from the corresponding upper milk-molar by its 

 narrowness. It is supported by two strong divergent fangs, the 

 anterior of which is broken away. The rest are more worn, and 

 deserve no further details. 



The following table embodies the measurements of the milk- 

 teeth from Doveholes, along with those of other specimens : — 



Milk-molars of Mastodon arvernensis. 

 (Measurements in millimetres.) 



Dm 2. Upper, Doveholes. Manchester Museum 



Dm 3. Upper, cast, Red Crag, Suffolk. Brit. Mus. ... 



Dm 4. Upper, Doveholes. Coll. Hick 



Dm 4. Upper, Doveholes. Man ch. Mus 



Dm 3. Lower left, Red Crag, Norfolk. Manch. Mus. 



Dm 4. Lower right, Doveholes. Coll. Hick 



Dm 4. Lower left, Doveholes. Manch . Mus 



Dm 4. Lower left, Bed Crag, Felixstowe. Brit. Mus. 



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