154 REPORT—1874. 
anterior and posterior cutting-edges, which disappear with age; base transversely 
oval, or even oblong-rectangular, adherent to the alveolar parapet, where there is 
one; no central pulp-cavity visible in the adult tooth; dentine much complicated, 
as in Mastodonsaurus. Mandibular articulation. (C. robustus) Postarticular pro- 
cess well developed ; a strong internal articular buttress ; glenoid cavity transversely 
extended, and bounded in front by a broad recurved flange, which receives the ante- 
rior edge of a horizontal plate (formed apparently by the quadrate and pterygoid 
jointly), so as to prevent dislocation of the mandible backwards. In C. arena- 
ceus the postarticular process is similar; the other details cannot be made out. 
Cranial sculpture. Each ossification strongly pitted towards the centre, and radiately 
grooved towards the circumference. Thoracic plates. (C. robustus) Median plate 
rhomboidal, with rounded entering angles; lateral plate not produced backwards, 
with strong reflected process ; radiately sculptured. Vertebre. Not certainly iden- 
tified ; those attributed to Capitosawrus robustus are discoidal, biconcave, very short 
in the antero-posterior direction. 
C. ARENACEUS, Minster. 
Orbits roundish. Parietal foramen transversely oval. The only skull known is 
smaller than any example of C. robustus. 
Locality. Keuper of Benk, Franconia; Bunter Sandstone of Bernburg ? 
References. Miinster, Jahrbuch fiir Mineralogie, 1836, p. 580.—Von Meyer, 
Paliontologie Wiirttembergs, p. 10 [1844].—Jd. Saurier des Muschelkalkes, 
p. 141, 152, t. lix. figs. 3-5 [1847-55].—Burmeister, Trematosaurus, p. 3 
1849}. 
Measurements (from Von Meyer's figure). pee 
Greatest breadth of Skil op... 5. sysyerstevnscloie ose. of6 ele) sjeca.efeye elm 9s ain lees 11? 
From tip of snout to anterior end of orbit ...........+6. (about) 14 
Tenet ioionbl bite ope opc:cfetsiststa tis she plaiaje,di> uolbie wo fao pie) a vie aieopemeaae 3 
AVAL EIEGIIO LONER tu. tereihegts bsteatagsys otis es oie el Gieleitic hale ae Senator (about) 2 
Least width of interorbital space ........... Sqaban soc (about) °75 
Greatest'\depth of mandible... 2. bis... elise eee wean 2°5 
Average length of mandibular teeth ........... essences ereree 625 
C. nopustus, Von Meyer. 
Orbits oval. Parietal foramen round. 
Locality. Keuper Sandstone of Wirttemberg. 
References. Von Meyer & Plieninger, Paliontologie Wiirttembergs, pp. 6, 21, 75, 
76, 77, &c., t. ix. figs. 1, 2,3, 7 [1844].—Quenstedt, Die Mastodonsaurier im 
Griinen Keupersandsteine Wiirttembergs &c. passim, t. i. figs. 1, 3, 4, 6, t. il, 
t. iii. figs. 4, 11?, 13, 15, 16, 17, 18, t. iv. (the shields and cranial bones in 
this plate cannot as yet be accurately determined) [1850].—Von Meyer, 
Saurier des Muschelkalkes, p. 146, t. lxi. fig. 10 [1847-55]. 
Measurements (from Quenstedt’s Plates). 
in. 
Tineil Temes alll ooh coude Gado dosodn 5 5 on OU nmGOpe eo ou or 23°5 
Greatestibrendih Of sks otras. epistve ase peseis’s «+ 0 > ose e vels ne 21 
Breadth at middle of orbits.............+4. Para nisle.a'« (eran eee 15 
From centre of occiput to posterior end of orbit ............000s 55 
From tip of snout to anterior end of orbit...............ee ee ees 14:2 
eneth wo on iets atte aetes ete uuetsl cise a ne ese ’e +c 6 oh ets othe em 2°5 
eWiidth of orbotterences teaver ttet en rctcae eects chet es ale's a la'w ss te felblatte 3 
‘Least width of interorbital paver” Toshio ees eee clenen 3°875 
Distance between external nasal foramina.........0 se sees ecco 24 
From tip of snout to external nasal foramen ............ (about) 2:2 
Lenptlvom palatinetoramiean tay strate tates aetse's o'r) = c's e's sete. cite aval 12:25 
Wridth of palatine foramen’ .).)0). ic. epeetateetayels(o's ie 'Fs (ss siesta ie wials 4:25 
Least distance between palatine foramina................60. joel SOs 
Greatest'depth of mandible.) oss iieteewles ss sieeieiciv velveteen olele 4:5 
