40 PROCEEDINGS OF THE ACADEMY OF [1897. 



The protoconids andparaconids are received in interdental spaces 

 of the upper jaw. The hypoconids occupy the valleys of the upper 

 molars. The valleys of the lower molars embrace the protocones. 

 The interdental spaces of the lower jaw are occupied by the meta- 

 cones. The minute cusps on the ridges connecting the paracone and 

 mesocone with the protocone are met with also in Lemur. The dis- 

 position is an ancient one, since it is seen in Chriacus of the Puerco 

 beds. In Anaptomorphus and Pelyeodus it is less marked, if indeed 

 indubitably present. Theo. N. Gill 6 and Max Schlosser 7 place Tar- 

 sius in a group distinct from the Lemuroidea, but closely related 

 thereto. C. E. Hubrecht 8 removes the form absolutely from prox- 

 imity to the lemurs, and gives it a place in the phyllum of the 

 monkeys and men. C. Earle 9 considers Tarsius to be an annectant 

 type between the apes and lemurs. 



The wear is first on the ridges between the protoconids and para- 

 conids and the anterior of the two ridges of the molars, and between 

 the hypoconid and the posterior of the two ridges. 10 



THE RUG^E. 



The palatal ruga? are nine in number. The first five lie between 

 the premolar and canine teeth ; they answer to the abruptly nar- 

 rowed part of the hard palate, and while composed of right and 

 left parts are irregular and crowded. The remaining four are regu- 

 lar and undivided. Directly back of the incisors is a median part 

 with two minute depressions. 



THE BRAIN. 



The cerebrum is without sulcus on the spheno-temporal lobe. The 

 olfactory lobe is much larger in Burmeister's figure than in the 

 Academy's specimen. The flocculus is large and is received in a 

 deep recess on the temporal bone. Burmeister states that the floc- 

 culus is present in T. tarsius, as we would expect ; but according to 

 his figure it must have had an absolutely different form from that 

 seen in T.fuscus. 



6 Arrang. Fam. Mam., Smith. Inst. 1872, 54. 



7 Beitragzur Paliiontolog. Osterreich-Ungarn, 1888, 54. 



8 Hubrecht's position is elaborately given in Gegenbaur's Festschrift 1896, 

 163. The teeth are compared and figured but not described. The conules of 

 the upper molars are not defined and thus one of the characters distinguish- 

 ing Tarsius from Anaptomorphus is not given. 



9 Science, 1897, 60. 



10 The superior upper incisor, lateral incisor and premolar in a specimen in 

 the American Museum of Natural History are exactly as in that of the Acad- 

 emy. 



