76 OS SUPEENFMEEAEY BONES IN THE SKULLS OF MAMMALS, [Feb. 7, 



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

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

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



Literature. 



(1) Denikeb, J. — " Eecherches anatomiques et embryologiques 



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

 1885. 



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



Akad. Munchen, yii. (1877) p. 96. 



(3) Bboca. — "Etude sur leCerveauduGorille." Eev. d'Anthrop. 



(2) i. 1878, p. 108. 



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



(5) Geatiolet.- — Comptes Eendus, i860, p. 801. 



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



(7) T. BiscHOFF. — " Die Mitte oder untere- Hirnwindung . . . des 



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



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



Proc. Acad. Nat. Sci. Philad. 1892, p. 203. 



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



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



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



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



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



(12) MoELLEE. — ' Beitriige zur Kenntniss des Anthropoid-Gehirns.' 



Berlin, 1891. 



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



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



Cerebral Hemispheres," Cunningham Memoirs, Eoy. Irish 

 Acad. 1892. 



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



Quart. Journ. Mier. Sci. xxsvii. p. 47. 



(16) Beddaed. — " 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 in 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. 



[Eeceived 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. 99C. 



