4 Dl?. A. SMITH WOODWAED OX A . [vol. Ixxili, 



line of the iiiterfrontal suture, which, however, judging from 

 the appearance of the broken surface, cannot have been persistent. 

 It shows a complete septum (a.) between the air-sinuses of the 

 right and left sides, and indicates the total thickness of the bone 

 at the frontal ci-est. 



The following are some measurements of thickness of the new 

 fossil, in millimetres : — 



Supero-lateral angle 10 



Thinnest part of lateral edge 8 



Sharp supraorbital border (fig. Id) 12 



Upper end of sagittal crest 13 



Lower end of sagittal crest 19 



With these may be compared the following measurements of 

 thickness of the original specimen of Eoantliroj)iis : — 



Left frontal at the nearest point of api^roacli to the 



part represented b}^ the new fossil 11 



Thinnest part of frontal above the left orbit 9 



The second fragment of human skull is the middle part of an 

 occipital bone, whicli is also well fossilized, but seems to have been 

 weathered since it was derived from the gravel (PL I, figs. 2ff-2c). 

 Though still stout, it is thinner than the coi'responding bone of 

 JEoanthropiis from Piltdown, and differs from the latter in at least 

 one important respect. The outer face of the fossil (fig. 2 a) ex- 

 tends upwards just be3"ond the superior curved line (s.c.l.) which 

 passes along a gentle transverse prominence ; while the lower edge 

 of the fragment is a little below the inferior curved line (/.c./.). 

 The inner face (fig. 2/;) shows the internal occipital crest (i.o.c.), 

 with its protuberance, displaced somewhat to the right of the 

 median line, the fossa for the left cerebral hemisphere (cer.) being 

 relatively' wide. The broad transverse grooves for the lateral sinus 

 (l.sL), however, are at the same level' on the right and left sides, 

 and the upwardly turned groove at the torcular Herophili (f.) of 

 the longitudinal sinus is large and conspicuous on the right. The 

 fossai for the cerebellum (ch.) indicate very little asymmeby. 

 The brain must thus have been much more nearly symmetrical 

 than that of the original specimen of Eoantliropus — a diiference 

 that is to be regarded as merely an individual variation. When, 

 however, a vertical section of the bone is made along the external 

 occipital crest (fig. 2 a, e.o.c.) which marks the median plane 

 (fig. 2 c), an essential difference is observable between this and 

 the previously' -described specimen. The superior curved line of 

 the outer face and (by inference) the inion, or external occipital 

 protuberance, are distinctly above the level of the upi)er edge of 

 the lateral sinus which denotes the limit of the tentorimii covering 

 the cerebellum ; whereas, in the first specimen, the same external 



