OSSIFEROUS CAVERN AT DOVEHOLES. 



119 



Vol. 59.] 



The true molars of Mastodon from Doveholes consist of two frag- 

 ments of molar 1 of the lower jaw, and a perfect true molar 2. 

 Their measurements are recorded in the accompanying table, along 

 with those of other teeth of the same species with which they have 

 been compared. The crowns of all these teeth present the same 

 strong development of bosses of enamel which block up the inter- 

 spaces between the ridges, the ridges themselves being formed of 

 alternating cusps. The specimen figured (PI. XI, fig. 2) is an unworn 

 crown covered with cement, with the four ridges and the usual 

 talons of the second true molar m2. 



The measurements of the true molars are as follows : — 



True molars of Mastodon arvemensis. 

 (Measurements in millimetres.) 



Ml. 



M2. 

 M3. 



M3. 

 Ml. 

 Ml. 

 Ml. 

 M2. 

 [MS. 

 M3. 



Upper right, Norwich Crag, Thorpe. Jermyn 

 Street 



Upper left, Red Crag, Suffolk. Manch. Mus.... 



Upper right, Red Crag, Woodbridge. Brit. 

 Mus 



Lower left, Red Crag. Felixstowe. Brit. Mus, 

 Lower, Doveholes. Salt Coll., Buxton 



95 



104 



182 



175 

 111 



Lower left, Doveholes. Manch. Mus 124 



Lower left, Red Crag, Felixstowe. Brit. Mus. ... 186 

 Lower right, Red Crag, Foxhall. Brit. Mus. ...I 235 



8 ; 6 



9 i 'r& 



54 58 



52 58 

 72 



72 



74 



46 



54 



46 



49 



44 



44 



52 



58 



82 



82 



86 



89 



52 



57 



47 



54 

 54 



56 

 51 



There are among the fragments of bones many which are assign- 

 able to Mastodon, such as an ulna and radius, and probably also a 

 gnawed humerus (PI. XI, fig. 3), all belonging to calves. 



(d) Elephas meridionalis , Nesti. 



A much-worn fragment of molar consisting of the base of the 

 anterior portion of a tooth, with one nearly perfect and portions of 

 the two adjacent plates (PI. X, fig. 4), belongs to Elephas meridionalis. 

 It has the thick rugose plicated enamel («), and the broad plates of 

 dentine (b) characteristic of that species, agreeing in these respects 

 with several specimens, worn to the same extent, in the British 

 Museum (Natural History). In this figure c represents the 

 cement. 



(e) Rhinoceros etruscus, Falconer. 



The genus Rhinoceros is represented by two fragments of water- 

 worn molars. One of these, consisting of the external lamina of 



