part 1] SECOND SKULL FROM THE PILTDOWIf GEAYEL. 7 



EXPLANATION OF PLATE I. 



[All the fig-ures are of the natural size.] 



Fig". 1. Eoanthropus dawsoni A. S. Woodward. Inner supraorbital portion 

 of right frontal : outer view (1 a) ; inner view (1 b) ; section along" 

 sagittal crest (1 c) ; and section at outer edge (1 d). a.=air-sinus ; 

 o.=frontal crest ; 7i. = supraorbital notch ; s. = supraciliary ridge. 



2. Eoanthropus dawsoni. Middle portion of occipital : outer view (a) ; 

 ■ inner view (b) ; and vertical median section along external 



occipital crest (c). c&. = cerebellar fossa; cer. = cerebral fossa; 

 e.o.c. = external occipital crest; i.o.c.= internal occipital crest; 

 i.e. L= inferior curved line; i.si.=groove for lateral sinus; s.c.i.= 

 superior curved line ; i.=groove above torcular Herophili. 



3. Eoanthropus dawsoni. Vertical median section of the occipital bone 



of the type- specimen along the external occipital crest. Lettering 

 as in fig. 2, with addition of i.=inion. 



4. Eoanthropus daivsoni. Left first lower molar: crown (a); outer (b), 



iimer (c), posterior (d), and anterior (e) views. 



5. Eoanthropus dawsoni. Eight first lower molar of the type-specimen, 



anterior view. 



6. Left first lower molar of Melanesian : crown (a) ; outer (6), inner (c), 



posterior (c?), and anterior (e) views. 



7. Left first lower molar of Tasmanian : crown (a) ; outer (6), inner (c), 



and posterior [d) views. 



8. Left first lower molar of large Chimpanzee : crown (a) ; outer (6), 



inner (c), posterior (d), and anterior (e) views. 



Appendix. 



On the Form of the Frontal Pole of an Encloci'anial Cast of 

 Eoanthropus dawsoni. 



Bj Prof. a. Elliot Smith, M.A., M.D., F.P.S. 



Although the fragment of the right side. of the frontal bone 

 reveals the form of only a small area (little more than 5 cm. long 

 X 3 cm. broad) of the endocranial surface, which is devoid of 

 obtrusive features, it is of interest and importance because it sheds 

 some light upon a part of the endocranial cast of which nothing 

 was known before. Moreover, it is a part of the cast, the frontal 

 pole, the form of which is of peculiar significance in the study of 

 the features of earl}^ Man. 



In a communication dealing with the endocranial cast of the 

 Boskop skull, which I presented to the Manchester Literar}'' & 

 Philosophical Society last month,^ I called attention to the small 

 size and lack of roominess of the prefrontal region of the cranial 

 cavity in Neanderthal man, and made special use of the form, and 

 relative size of the prefrontal area of the Boskop cast to establish 



^ This will be published in the Transactions of the Royal Society of So uth. 

 Africa. 



