150 DR. W. G. RIDEWOOD ON THE [Jan. 19, 



BoviDiE (con.). 



Species: — Oryxheisa. F 3 



Oryx gazella. F 2 young specimens 



Addax nasomacidatus. F 1 



Saiga tatarica. lis 1 



Genns E quits. f 100 examined specially 



E. caballus. F 6' Pe I ^1 6^ < in addition to a very 



[ large series observed. 

 E. asiims (domestic) 'N Pjs I ... 20 



Mule. NPeI 20 



E. equuletis. F Pe I 5 



E. asinus somcdicus. F 1 



E. hemionitjS. F^I 2 



E. onager. 'E Al 2 



E. zebra. FC 2 



E. zebra hurcheUi. F ^ C 5 



E. zebra grevyi. F C 3 



E. quagga. F 1 



3. Some Observations on the Sknll of the Giraffe. By W. 

 G.IliDEWOOD, D.Sc, F.L.S., F.Z.S., Lecturer on Biology 

 at the Medical School of St. Mary's Hospital. 



[Eeceived November 30, 1903.] 



(Text-figures 4-10.) 



Since the time of Blumenbach * it has been known that the 

 paired horns of the Girafie are formed in the young as sepai^ate 

 bony columns or " epiphyses," which later fuse with the almost 

 smooth tipper surface of the cranium ; and shortly before the 

 publication of his memoir on the Okapi f Prof E. Ray Lank ester 

 learnt that a skin of the Okapi had arrived at Brussels with the 

 paired horns, or, as he proposes to call them, the " ossicusps," 

 separable from the skull +. A few weeks prior to the latter dis- 

 covery Prof. Lankester had caused a section to be made length- 

 wise down one of the horns of the skull of a well-grown male 

 Giraffe §, with the object of ascertaining to what extent the suture 

 between the bony pillar and the cranial roof might remain visible. 

 So far as the suture was concerned, the result was a little dis- 

 appointing, but the section showed that the great fronto-parietal 

 sinuses extend upwards into the bases of the horns (as described 



* Handb. d. vergl. Anatomie, Gottingen, 1805, p. 36, footnote. 



t Trans. Zool. Soc. xvi. 6, 1902. 



X The matter is referred to in an appendix, dated May 27th, to Prof. Lankester's 

 memoir, pp. 305 & 306. The ossicusps were described by Dr. Porsytli Major in 

 'La Belgique Coloniale,' Nov. 9th, 1902, p. 533, and are again alhided to in his paper 

 in the Proc. Zool. Soc. 1902, ii. p. 344. 



§ Brit. Mus. Register No. 1.8.9.48. Presented by Sir Harry Johnston, K.C.B. 

 Locality— Guas Ngishu Plateau, E, of Mt. Elgon, Brit. E. Africa. 



