1868.] 



457 



[Wyman. 



V. From the Warren Museum, and supposed to be from a subject 

 about three years old, and is represented in Figs. 3 and 4. The milk 

 teeth are fully developed, but the crowns of the permanent incisors 

 are deeply buried in their alveoli. The sagittal suture is wholly ob- 

 literated; the median ridge and the vascular openings, with the 

 peculiar radiated appearance described in the preceding specimen, as 

 also the appearance of a median centre of ossification, exist here in a 

 marked degree. This cranium is remarkable for its great length, the 



Fig. 3. 



Fig- 4. 



index of breadth being only 62.6. The foramen magnum is central, 

 the increase in length having taken place equally tbrwards and back- 

 wards. This also appears from the equal protuberance of both fore- 

 head and occiput. The occipital region jiresents outwiirdly, as it were, 

 a cast of the cerebellum, two bulgings corresponding with the lateral 

 lobes, project downwards beyond the tips of the mastoid processes. 

 The hinder lobes of the cerebrum can also be traced in a similar way, 

 and form a third bulging in the outer surface of the occiput. 



VI. Cranium of a foetus from the Warren Museum, repre- 

 sented in Figs. 5 and 6, of a little less than one-half the natural size, 

 linear measurement. In the preparation of the skull the bones were 

 somewhat displaced in consequence of the extent to which decomjjo- 

 sition had taken place, but are drawn as if in their natural position. 

 Dr. J. B. S. Jackson, however, observed, when the head was still 

 recent, that the deformity similar to that of the preceding specimens 



