432 W. K. GREGORY NOTHARCTUS AND LEMUROIDEA 



arrangement leading to that of the higher Primates, while the Chiro- 

 galeinse of the Lemuriformes and the Lorisidse of the Lorisiformes have 

 independently acquired an aberrant arrangement by which the main 

 branch of the internal carotid avoids the bulla entirely and enters through 

 a foramen lacerum medium. 



A CLASSIFICATION OF THE LEMUROIDEA 



Order PRIMATES 

 Suborder Lemuroidea 



Series lemuriformes 



1. Malar touching lacrj^mal. 



3. Orbits widely opening into temporal fossse. 



3. Lacrymal foramen primitively within orbit, often secondarily in front 



of orbit. Lacrymal often extended in front of orbit. 



4. Nasals often retracted, rostrum more or less truncate, rarely (Chiro- 



galeina?) produced. 



5. Auditory bullae usually of moderate size. 



6. Ectotympanic inclosed within bulla, forming a ring or horseshoe. 



7. Stapedial branch of internal carotid artery typically large. 



8. Main branch of internal carotid typically of small size, running in 



carotid canal over the cochlea and piercing the basisphenoid. 

 Exceptionally entering in front of bulla (Chirogaleinte). 



9. Placenta diffuse, adeciduous. 



10. Digit IV of manus the longest. 



11. Digit II of manus sometimes inore or less reduced. 



Family Adajjidse 



Dental formula: I—' C— ' P—' M— • 

 2 14 3 



Medial upper and lower incisors broad-edged and spatulate ; medial lower 

 incisors more or less erect (that is, not markedly procumbent). 



Lower canines caniniform; lower p, not caniniform, not opposing upper 

 canine. 



Lacrymal not expanded on face, but lying within the orl)it; lacrymal 

 foramen marginal. 



Brain-case but little expanded. 



Sagittal and lambdoidal crests high. 



Fundamental architecture of skull identical in the two subfamilies. 



