RY C. W. DE VIS. 99 



ExampJes — -Jive. 



Mandibular. — A left ramus with all the cheek-teeth in place; 

 incimibent folds on m.'* distinct, on the other teeth almost 

 obliterated by old age (10607); vascular foramen large — A left 

 ramus with all the cheek-teeth (10726); distinct relics of the folds 

 on the posterior molars; vascular orifice large; aging — A right 

 ramus with the first three molars, sockets of p.* and m."^; folds 

 distinct on all the teeth (8831); vascular orifice large; adolescent 

 — A left ramus vvith all the cheek-teeth but the last; the rising 

 premolar exposed (10233); vascular orifice moderate; young — A 

 fragment of a left ramus with the anterior portion of the milk 

 premolar. 



Key to fossil Halmaturi. 



AVidth of m."' 7 '6 and upwards. 



P."*^ with a large intero-posterior dilatation; lobes 



with folds vincPAis 



P. ^ with no large intero-posterior dilatation 



Crown of p.* with an anterior lobe partially 



divided off thor 



Crown of p. ^ without anterior lobe partially 

 divided off 

 Size larger; length of m.^, m.-, m.'^ 32*0 or up- 

 wards aiiak 



Size smaller; length of m. ^, m. ^, m.^ 23 '5 



Intero-anterior surfaces of lobes smooth dnjas 



Intero-anterior surfaces of lobes with ac- 

 cessory processes odia 



Width of m."^ 6*5 or less. 



P. ^ with a large intero-posterior cusp; crests of 



molars straight indra 



V.^ with a smaller intero-posterior cusp; fore 

 valley of anterior molars with an accessory 

 link siva 



