CESTRACIONTIDJS. 
283 
Type. Detached teeth; Bristol Museum. 
A small species, the principal teeth not measuring more than 
0*01 in length. Longitudinal keel moderately developed in all the 
teeth, a median transverse keel also in manv ; minute lateral denticles 
often present; superficial wrinkles large, occasionally feeble, some¬ 
times bifurcated. 
Form. 6)' Loc. Keuper : Saxe-TVeimar, Wiirtemberg, and Hanover. 
Bhaetic : SM . EnglaDd, and (?) Elgin, Scotland, /^/CTnrCj 
S Tlnrj ukfc « 
23153. Two portions of bone-bed, with numerous teeth; Bhaetic, 
Aust Cliff, near Bristol. Purchased , 1849. 
P. 2155. About one hundred teeth from the Bhaetic fissure at Hol- 
well, near Eronie, Somersetshire 1 . Egerton CoJl. 
P. 2135. Twenty teeth ; Bhaetic, Axmouth, Devonshire. 
Egerton Coll. 
P. 2130. Slab with several teeth; Axmouth. Egerton Coll. 
P. 2759. Twelve teeth; Axmouth. Enniskillen Coll. 
\ 
P. 2136. Twelve teeth, supjDosed to have been obtained from the 
Bhaetic of Linksfield, Elgin. Egerton Coll. 
P. 2150. Two small teeth, probably of this species, received from 
Count Munster under the MS. name of A. angustus , 
Miinst.; Hildesheim, Hanover. Egerton Coll. 
Acrodus nobilis, Agassiz. 
1837. Acrodus nobilis, W. Buckland, Geol. & Min. 2nd edit. vol. ii. 
p. 47, pi. 27 e (name and fig. only). 
1838. Acrodus nobilis, L. Agassiz, Poiss. Foss. vol. iii. p. 140, pi. xxi. 
1839. Acrodus latus , L. Agassiz, tom. cit. p. 144. 
1839. Acrodus gibberulus, L. Agassiz, tom. cit. p. 144, pi. xxii. figs. 1-3. 
1840. Acrodus nobilis, B. Owen, Odontography, vol. i. p. 54, vol. ii. 
pis. xiv., xv. 
1858. Acrodus arietis , F. A. Quenstedt, Jura, p. 90, pi. viii. fig. 10. 
Tyjpe. Incomplete dentition; Bristol Museum. 
The type species, of very large size, the principal teeth often 
measuring 0 1 045 in length. Coronal contour gently rounded, 
covered by very fine wrinkles, frequently branching and reticulate; 
longitudinal crest undeveloped, and only indicated by the divisional 
line of the ornament. Anterior teeth short and broad, without 
1 See Charles Moore, Quart. Jonrn. Geol. Soc. vol. xxiii. (1867), p. 483. 
