172 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



lower jaw. The bones are dirty brownish on the surface, yellowish- 

 white to dull ocher-yellow on break, and in spots somewhat cor- 

 roded or scaled; they are largely devoid of animal matter, but are 

 not chalky or mineralized. 



The skull is that of a male, of perhaps 00 years of age, the coronal 

 and lambdoid sutures showing- advanced synostosis. It is neither 

 artificially nor accidentally deformed, and what is left of it shows no 

 artefacts or disease. It was of moderate, but perhaps not subaverage 

 Indian, internal capacity; the only external measurement bearing 

 on its size that can be approximated is the length, which was near 

 1!> cm. In shape the skull was dolichocephalic, or somewhere near 

 the boundary of dolicho- and mesocephaly. Its walls are thicker 

 than usual, the right parietal measuring above and along the squa- 

 mous suture from to 8 mm. There are signs of strong but not ex- 

 cessively developed muscularity. The ventral surface shows a dearth 

 of brain impressions. 



The principal features of interest about the specimen are its promi- 

 nent supraorbital arcs, or crests, and a low forehead. The arcs 

 extended over the whole distance from the glabella to the external 

 angular process of the frontal bone on each side, though they are 

 most pronounced over the median two-thirds of the supraorbital bor- 

 der, the space corresponding to the frontal sinuses. The more distal 

 parts appear as if drawn forward through the development of the 

 proximal ; they doubtless expanded in consequence of the growth of the 

 ridge- proper. The frontal sinuses were, it is seen from the remnant 

 of the one on the right, of large dimensions; about 1.5 cm. from the 

 median line the right cavity measures 1.1 cm. antero-posteriorly by 

 1.8 cm. in length, and its original length was near 3 em. The shallow 

 depression which usually exists between the supraorbital ridges and 

 the frontal bend is exaggerated. A dull low ridge extends over the 

 middle third of the forehead in the median line — an external nietopic 

 crest seen often in varying grade in the dolichocephalic Indian- The 

 ventral metopic crest is of moderate dimensions. 



The prominent supraorbital ridges and the depression above them 

 accentuate and to not a small extent create the appearance of lowness 

 and slope of the forehead in this skull; without these features the 

 Tore part of the frontal bone could hardly be termed exceptional, 

 when compared with average, dolichocephalic, Indian crania. When 

 i he skull is examined ventrally, a fair and uniform concavity, cor- 

 responding to quite well-developed frontal lobes of the brain and 

 standing in no visible relation with the external protrusion is found. 

 All this leads to the conclusion that this particular skull represents 

 a type of a distinct class of crania with apparently low or sloping 

 foreheads, a class of cases due in the main to an extraordinary deveL 

 opment of the frontal sinuses. 



