38 PROCEEDINGS OF THE ACADEMY OP [1897. 



Burmeister does not acknowledge the marginal pads to be present, 

 but describes three unequal elliptical pads which answer in part to 

 the free basal segment ; the middle corresponds to " den beiden ersten 

 Zehen " (second and third digits), the third, the smallest but longest 

 on the outer (fibular) border of the " zwei letzten Zehen " (fourth 

 and fifth digits). Thus no statement is made of the extent to which 

 the pollical pad overlies the first inter-digital space, as is seen in the 

 Academy's specimen, and of the third pad lying to the outer side of 

 the last two toes. In the Academy's specimen it is distinctly inter- 

 digital. 



THE SKULL. 



The skull of T. fuscus differs from that of T. tarsius in the tym- 

 panic and petrous portions of the temporal bone being greatly in- 

 flated, in the orbital border of the malar bone being notched in- 

 stead of perforated, and the orbital plate of the frontal bone being 

 smooth instead of furnished with a tuberosity over the inner border 

 of the optic foramen. A skull of T. tarsius in the possession of the 

 Academy of Natural Sciences of Philadelphia is older than that of 

 T. fuscus, yet the position of the para-conules and the meta-conules 

 is cleanly defined. . 



The infra-orbital canal is minute; the post-glenoid foramen is 

 conspicuous. The union of the external pterygoid plate with the 

 petrous portion of the temporal bone is met with in some short faced 

 types in Chiroptera. The interesting comment is made that in those 

 human crania in which the external pterygoid plate unites with the 

 spinous process, which in its turn joins the squama and lies directly 

 against the petrous portion of the temporal bone, the essential 

 features of Tarsius are repeated. 



THE TEETH. 



The Lower Teeth. — I have lately concluded that anatomical de- 

 scriptions should be framed when practicable on the basis of etiology. 

 Assuming that the shapes of the upper teeth are results of dynamic 

 forces acting through and by means of the lower teeth, the last 

 named teeth should be described first. The incisors are conical, aci- 

 cular, and do not touch in the median line ; the canines are larger 

 than the incisors and slightly inclined forward. The premolars are 

 contiguous and gradually increase in size from the first to the third. 

 In the molar series the small paraconid and larger protoconid are 

 opposed and merge so as to form a trenchant transverse ridge on the 



