SKULLS OF CYNODONT REPTILES. 925 



Owen, R. — On tlie Skull and Dentition of aTriassic Mammal [Tritylodnn longcevns 

 Owen) from South Africa. Quart. Journ. Geol. Soc. Lond., Vol. xl, 

 1884, p. 146. 



On the Skull and Dentition of a Triassic Saurian {Galesaurus planiceps 



Ow.). Quart. Jouni. Geol. Soc. Lond., Vol. xliii, 1887, p. 1. 

 Seeley, H. G.- — Researches on the Structure, Organisation, and Classification of 



the Fossil Reptilia. VI. On the Anomodont Reptilia and their Allies. 



Phil. Trans., Vol. clxxx (1889) B, p. 215. 

 • Idem. IX. Sect. 1. On the Therosuchia. Phil. Trans., Vol. clxxxv (1894) 



B, p. 987. 



Idem. IX. Sect. 2. The Reputed Mammals from the Karroo Formation 



of Cape Colony.— Part IX. Sect. 3. On JJiademodon. Phil. Trans., 

 Vol. clxxxv (1894) B, p. 1019. 



Idem. IX.Sect.4. OntheGomphodontia. Phil. Trans., Vol. clxxxvi (1895) 



B, p. ]. 



Idem. IX. Sect. 5. On the Skeleton in New Cynodontia from the Karroo 



Rocks. Phil. Trans., Vol. clxxxvi (1895) B, p. 59. 

 • On the Dentition of the Palate in the South Afi-ican Fossil Reptile Genus 



Gi/nognatlms. Geol. Mag-., 1908, p. 486. 

 Thyxg, F. W. — Squamosal Bone in Tetrapodous Vertebrata. Proc. Bost. Soc. Nat. 



Hist., Vol. xxxii. No. 11, p. 387, 1906. 

 Veesluts, J. — Ein grosses Parasphenoid bei Dermoclieli/s coriacea Linn. Zool. 



Jahrb., Bd. xxviii, Anat., 1909, p. 283. 

 ■ Bemerkungeu zum Parasphenoid \o\\ Dermoclielys. Anat. Anz., Bd. xxxvi, 



1910, p. 487. 

 WiiLiSTON, S. W.— The Temporal Arches of the Reptilia. Biol. Bull., Vol. vii, 1904, 



p. 175. 

 Wilson, .J. T.— On the Skeleton of the Snout of the Mammary Foetus of Mono- 



tremes. Proc. Linn. Soc. N.S.W., 1901, pt. 4, p. 717. 

 Woodward, A. S. — Outlines of Vertebrate Palseontology for Students of Zoo- 

 logy. Cambridge, 1898. 



Explanation of lettering in the Plate and Text-Jigitres. 



Ancj. Angular; Art. Articular; Aud.gr. Auditory groove; B.O. Basioccipital ; 

 B.S. Basisphenoid; Dent. Dentary; i'.O. Exoccipital ; E.v.st. Extrastapedial ; 

 J'r. Frontal; Ju. Jugal ; I.P. Interparietal; La. Lachrymal; 3Iall. Malleus; 

 Me7i. Meniscus ; 3£x. Maxilla ; Na. Nasal ; 0.0. Opisthotic ; Pa. Parietal ; 

 Pal. Palatine; Pm.v. Premaxilla; Po.O. Postorbital; Pt-.F. Prefrontal; Pt. 

 Pterygoid ; P. Vn. Prevomer ; Qu. Quadrate ; S.Ang. Surangular ; Sm.r. Septo- 

 maxillary ; S.O. Supraoccipital ; Sq. Squamosal ; Tj/m. Tympanic ; Vo. Vomer. 



EXPLANATION OF PLATE XLVI. 



Fig. 1. Side view of the cranial wall of Cynognathus herryi. Half nat. size. 



2. Occiput of Cy iiognatlms berryi. Half nat. size. 



3. Side view of the skull of Meiinodon simus. Nat. size. This represents the 



type and only known specimen. It is so badly crushed that it is 

 impossible to restore it with any confidence. Six molars of the right side 

 are preserved, and the axes of two molar series make with each other an 

 angle of about 60°. The frontal region is certainly narrow, and as the teeth 

 are ^■ery similar to those of Sesamodon it is probable that the skull is also 

 somewhat similar, but probably the snout is shorter in dielinodon and the 

 skull relatively broader. 



4. The molar teeth of the left side of Sesamodon browni as preserved. X IJ. 



5. Base of the skull of Sesamodon, browni as preserved. X 1^. 



6. Quadrate and part of the squamosal of Bauria cynops, as seen from the 



front. Nearly twice nat. size. 



7. Base of skull of Bauria cynops, viewed partly from the side to show the 



deep keel of the basisphenoid. 



8. Occiput and base of skull of Bauria cynops, viewed from behind and parti}' 



from below. Slightly restored. About two-thirds nat. size. 



9. Median section of skull of Biademodon. All parts in unbroken line are 



from the specimen in the South African Museum. The prevomer and septo- 

 maxillavy as restored are founded partly on the British Museum specimen 

 of Gomphognathus and are partly hypothetical, the inner part of neither 

 bone bemg known in any specimen. About half nat. size. 



