418 Proceedings of Eoyal Society of Edinhurgli. [sess. 
somewhat deformed and elongated lesser wings of the sphenoid 
bone, (&) anteriorly by the frontal bone, and (c) posteriorly by the 
sella turcica of the sphenoid bone. The post-sphenoid bone and 
the greater wdngs were almost normal. The sutures in front of the 
two petrous portions of the temporal bone formed almost a straight 
line across the skull. Apparently this was the result of the 
greater wings of the sphenoid being abnormally approximated to 
each other. The position of the sutures of the remaining bones 
entering into the floor of the cranial cavity is, as shown by fig. 10, 
quite normal, with the exception of that between the two frontal 
bones which was absent posteriorly. There was a minute foramen 
in the floor of the sella turcica, which probably represented the 
remains of Eathke’s canal. 
II. The anterior aspect of the hones of the face (fig. 11). — In 
the place of the two orbits and nasal bones was a large median cavity, 
nearly elliptical in shape, measuring transversly ~ in., and vertically 
about ~ in. This was bounded above by the frontal bone, and 
laterally by the malar and a small portion of the superior maxillary 
bone. There was no trace of the ethmoid, vomer, nasal, or 
lachrymal bones, or of the nasal process of the superior maxillary 
bones. The median cavity between the lesser wings of the sphenoid 
and the two sphenoidal fissures are seen in the diagram. On the 
floor of the cavity there projected backwards from the superior 
maxillae, over the distance of about half an inch, a flat plate of bone 
J in. broad. This apparently represented the orbital plates of the 
superior maxillary bones which had become fused in the middle 
line owing to the absence of the bony structures which normally 
intervene. The frontal bones presented a boss-like projection 
about ^ in. above the orbit, from which the lateral parts of the bone 
sloped somewhat rapidly backwards and outwards. Above this pro- 
jection a slight trace of median suture was seen. On the internal 
aspect of the bone the orbital plates were not horizontal, but sloped 
gradually upwards into the more vertical portion of the bone. In 
the superior maxillae the two infra-orbital foramina were within 
■jQ in. of each other. There were no pre-maxillary bones. The 
malar bones seemed normal in form and in their articulations, 
but their anterior extremities were abnormally approximated, owing 
to the defective development of the superior maxillae. The lower 
