152 REPORT—1874. 
M. GicanTEus, Jager (M. Jégers, Alberti). 
Interorbital space much less than transverse diameter of orbit. Parietal foramen 
round, in the middle of the parietal suture. Choana roundish. Palatine foramen 
bluntly angulated at its anterior extremity. Teeth regularly conical, slightly 
curved, striate, except at the apex, an additional series of alternate and equal striz 
being intercalated towards the base. 
The largest known Labyrinthodont. 
Measurements. (From a fragment figured by Von Meyer, ‘ Saurier des Muschel- 
kalkes,’ t. lviii.) 
in. 
Widthiof,palatine-foramen cercetioncemeetncs te ace see ae © ae ere 4:8 
Least distance between palatine foramina..................0005 2°56 
Extent of mandibular’ symphysis \ jncnritdih eis. Jee». oe ne eo ie 3 
Greatest length of palato-vomerine tusks..... Sonera Sabie (about) 4 
Diameter of largest palato-vomerine tusk..............0000enee 15 
(From the Gaildorf specimen in the Stuttgard Museum.) 
Motalslenophyons alleee ras crheteis sts leiei Gi agle’ + sje 'o ss oKeloretetets atateeds 30°5 
ength of skulllvalonp middle Liners. vic oie ci. « epee oh « emis ioeenes 23°625 
(Chnpatie st Drend Lan Otys Hath ceacawe tes ajeteata sts) «fs, o> fole/niw’ «lolol heumtele ol akeaale 22°75 
Breath ai Ab CAVES OfsOL DUDS aye ajo.s satrase.o \s\aveve cielovnlayel ebehols thereto ten 19°5 
From centre of occiput to posterior end of orbit ..............-. 6 
From tip of snout to anterior end of orbit. ......... 2.00. ee eee es 13°5 
[Daisey Ord. 016 Onis pioneaegocionictiner ASIBIO id tidib crn iW Oiuoicicta oOo rt 6:25 
VAG COON eas An ceo OcOn COB Satay OntaD SOT Cc soso Dob © 4 
Least width. of, interorbital space, + sj). eres ogee ww ieperew ams ote aS tae 
Meng th’ of palatine SOAIMOM «etre vie aves oe e's vele) aie vale e/viaivle (about) 14 
Width: of palatine foramen! sammie sergiss «cies cs owe wei slce ec sieeiens 4:75 
Least distance between palatine foramina..............eeeeeeee 
Extent of mandibular ‘symip byes oor. oc wy bya Be os owes ore es cincrele 2 
Length of postarticular process of mandible.............. (about) 4 
Locality. Lettenkohle, Gaildorf, Wiirttemberg; Keuper Sandstone, Guy’s Cliff, 
Warwick; Rheetic, Aust Cliff (near niet Muschelkalk of Schwenningen? 
References. Jiiger, Fossile Reptilien welche in Wiirttemberg aufgefunden worden 
sind, pp. 35, 38, t. iv. figs. 4, 5, 6, t. v. [1828 ].—Von Meyer, Palologica, p. 107 
[1832 }.—Jd. Bullet. der Geol. Soc. in Frankreich, vol. iii. pp. 86-89. Jia- 
ger here unites the two genera Mastodonsaurus and Salamandrovdes | 1833 ].— 
Alberti, Beitrag zu einer Monographie des Bunten Sandsteins, Muschel- 
kalks, und Keupers, &c, p. 120 Boe gl aah ee Meyer and Plieninger, Palion- 
tologie Wiirttembergs, Ep 6, 21, 57, &c., tt. ili—vi. fig. 1, t. vil. fig. 1, t. xii. 
fiz. 14 [1844].—Owen, Trans. Geol. Soc. 2nd ser. vol. vi. p. 537, t. xlvii. 
[1842].—Jd. Odontography, p. 195 &e., t. Ixiii. fig. 1, tt. Lxiv., Ixy. [1840-5]. 
—Von Meyer, Saurier des Muschelkalkes, pp. 93, 144, &e. tt. lviii., 1x1. 
figs. 4-9, t. lxiv. figs. 1, 2, 15 Fa 1 seers Ueberblick iiber die 
Trias, &e., p. 255 [1864].—Miall, Q. J. Geol. Soc. vol. xxx. p. 480, &e., 
fig. 2 is74) 
M. PACHYGNATHUS, Owen. 
Numerous fragments have occurred in the Keuper Sandstone of Warwick, which 
indicate a species of Mastodonsaurus considerably smaller than M. giganteus. The 
mandibular teeth are less conical than in the last-mentioned species ; they preserve 
much of their thickness to near the apex, when they taper rapidly. Though some 
arts of the fossils attributed to this species throw light upon the structure of the 
abyrinthodont skull, their zoological value is hitherto small, and the species can- 
not be regarded as thoroughly established. 
References. Owen, Trans. Geol. Soc. 2nd ser. vol. vi. p. 526 &c., t. xliii. figs. 4-11, 
t. xliv. figs. 1-3, t. xlvi. figs. 6, 7 [1842].—Von Meyer & Plieninger, Pali- 
ontologie Wiirttembergs, p. 36 [1844].—Jd. Saurier des Muschelkalkes, 
p. 159.—Owen, Odontography, p. 205, &c., t. xiv. B. figs. 1, 2 [1840-5].— 
