76 ON SUPERNUMEEARY BONES IN THE SKULLS OF MAMMALS. [Feb. 7, 



the brain illustrated in fig. 1 (p. 66) does away with this supposition, 

 since the fissure which evidently corresponds to F.jp.i. of fig. 6 is 

 clearly continuous with and a part of the sulcus frontalis superior. 



Literature. 



(1) Deniker, J. — " Eecherches auatomiques et embryologiques 



sur les Singes anthropoides." Arch, de Zool. Exp.(2)iii. bis, 

 1885. 



(2) T. BiscHOFE. — " Ueber das Gehirn eines Grorilla, &c." SB. 



Aiad. Miinchen, vii. (1877) p. 96. 



(3) Beoca. — " Etude sur le Cerveau du Grorille." Eev. d'Anthrop. 



(2) i. 1878, p. 108. 



(4) Owen. — Trans. Zool. Soc. vol. v. p. 267. 



(5) Gratiolet. — Comptes Eendus, 1860, p. 801. 



(6) V. BiscHOFF, in Morph. JB. 1878, p. 59. 



(7) T. BiscHOFF. — " Die Mitte oder uutere Hirnwiadung . . . des 



Gorilla.'"' Morph. JB. 1882, p. 312. 



(8) Chapman. — " Observations upon the Brain of the Gorilla." 



Proc. Acad. Nat. 8ci. Philad. 1892, p. 203. 



(9) Pansch. — " Ueber die Furchen und Windungen am Gehirn 



eines Gorilla." Abhandl. Geb. Nat. Hamb. 1876. 



(10) Pansch. — " Einige Bemerkungen iiber den Gorilla und sein 



Hirn." Schr. nat. Ver. Schlesw.-Holstein, 1878, p. 127. 



(11) Thane, in 'Nature,' xv. p. 142. 



(12) Moeller. — ' Beitrage zur Kenntniss des Anthropoid-Gehirus.' 



Berlin, 1891. 



(13) Keith, in ' Natural Science,' ix. p. 26. 



(14) Cunningham. — " Contribution to the surface Anatomy of the 



Cerebral Hemispheres.'"' Cunningham Memoirs, Eoy. Ii-ish 

 Acad. 1892. 



(15) Bbnham. — "A Description of the Cerebral Convolutions, &c." 



Quart. Journ. Micr. Sci. xxxvii. p. 47. 



(16) Beddard. — " Contributions to the Anatomy of the Anthro- 



poid Apes." Trans. Zool. Soc. xiii. p. 177. 



2. Note on the Presence of Supernumerary Bones occupying 

 the Place of Prefrontals iu the Skulls of certain 

 Mammals. By Robert O. Cunningham, M.D., D.Sc, 

 F.L.S., F.G.S., C.M.Z.S., Professor of Natural History, 

 Queen's College, Belfast. 



[Receiyed November 21, 1898.] 



About two years ago ^ I addressed a brief communication to the 

 Zoological Society on the occurrence of a pair of small bones in 

 the skull of a Lemur, occupying a corresponding position to the 

 prefrontals of a Eeptile. In that paper I referred to similar bones 

 having been previously recorded in the skull of a Hippopotamus. 



1 Cf. P. Z. S. 1896, p. 996. 



