316 TERTIAET VERTEBEATA OP THE FAYtTM. 



pectoral spines are still articulated with the shoulder-girdle ; so far as can be seen the 

 ornamentation was similar to that o£ the dorsal spine ; the length o£ these spines must 

 have been about 17 cm., their width at the base 3'5 cm. 



P. 10258. Large imperfect skull, wanting the posterior portion ; the greatest width of its anterior 

 end is about 23 cm. Presented hy the Egyptian Government, 1904. 



The following specimens belong to various Siluroid fishes, but cannot be more definitely 

 determined : — 



P. 10252. Anterior complex vertebra of a particularly long and slender form. Its length is 

 16'4 cm. ; the depth of the anterior face of the centrum about 6 cm. 



Presented hy Baron Nopcsa, 1905. 



P. 10253. Three anterior complex vertebrae, similar in form but of smaller size than last. 



Presented hy Baron Nopcsa, 1905. 



P. 10251. A number of anterior dorsal vertebrae with short disc-like centra. One of these measures 

 1*7 cm. in length at its ventral edge, while its height and width are about 5'3 cm. 



Presented hy Baron Nopcsa, 1905. 



P. 10255. Vertebrae, probably from further back in the column. The centra are much larger than 

 those just described. They are in most cases deeply biconcave^ and laterally are 

 excavated by a pair of dorso-lateral depressions and a pair of ventro-lateral depressions. 



Presented hy Baron Nopcsa, 1905. 



P. 10241. Anterior complex vertebrae and the three succeeding disc-like vertebrje of an individual of 

 large size. The length of the complex vertebra is 16'5 cm., the height of its anterior 

 face about 6 cm. Presented hy the Egyptian Government, 1904. 



P. 10242. A series of united dorsal vertebrae with very short centra. The processes are well 

 preserved in some part of this column. Presented hy the Egyptian Government, 1904. 



P. 10246. Two very large and massively constructed vertebrae. One of these bears well-developed 

 zygapophyses, such as may be seen in the vertebral column of Bagrus. The peculiarity 

 of these processes is that the articular surfaces of the anterior zygapophyses look outwards 

 and downwards, those of the posterior, here sessile on the centrum, upwards and a little 

 inwards, the opposite to what usually occurs in the higher Vertebrates. 



C. 10201. Long and slender anterior complex vertebra, similar to P. 10252. Length 16 cm. 



C. 10200. Much smaller and especially shorter complex vertebra. Length 9 cm. 



C. 10052. Series of six dorsal vertebrae with disc-like centra. 



C. 10049. Large, deeply biconcave vertebrae similar to P. 10255. 



P. 10257. Imperfect pectoral spine. The anterior edge bears a row of transversely elongated 

 tubercles near the tip ; the sides of the spine also are tuberculate. Length so far as 

 preserved 16'4 cm. 



