CESTRACIONTIDjE. 
295 
P. 5867. Small spine, 0-33 in total length, with traces of moderately- 
sized denticles, perhaps correctly placed here. 
Acrodus leiodus, A. S. Woodward. 
1844. Acrodus leiodus, L. Agassiz, Poiss. Foss. vol, i. p. xxxviii (name 
only). 
1871. Acrodus, J. Phillips, Geol. Oxford, diagr. xxxvii. p. 177, fig. 10. 
1887. Acrodus leiodus, A. S. Woodward, Geol. Mag. [3] vol. iv= p. 101, 
woodc. 
Type. Detached teeth: British Museum. 
Principal teeth not attaining to a greater length than O’Ol. 
Coronal contour gently rounded, with an obtuse median longitudinal 
keel, and very little elevated even in the anterior teeth. Super¬ 
ficial ridges large and rounded, disposed in the usual manner ; traces 
of lateral prominences in the anterior teeth indistinct. 
Form. § Log. Bathonian : Wiltshire, Oxfordshire, and Gloucester¬ 
shire. 
P. 5873. Type specimen, figured, of twice the natural size, in 
PI. XIII. fig. 6 : Great Oolite, Minchinhampton, Glou¬ 
cestershire. Byne Coll. 
P. 5874. Six teeth, five abraded and broken, the sixth from the 
symphysial region, and shown, of twice the natural size, 
in PI. XIII. fig. 5 ; Great Oolite, Minchinhampton. 
Byne Coll. 
36583, 41316. Three teeth ; Stonesfield Slate, Stonesfield, Oxford¬ 
shire. Purchased , 1862, 1869. 
P. 2134. Three abraded and broken teeth bearing Agassiz’s MS. 
label; Stonesfield Slate, Stonesfield. Egerton Coll. 
P. 2753. Four teeth, one shown, of thrice the natural size,in PI. XIII. 
fig. 7 ; Stonesfield Slate, Stonesfield. Enniskillen Coll. 
30559. Tooth ; Forest Marble, Atford, near Bath. 
Purchased , 1856. 
Acrodus leiopleurus* Agassiz. 
1839. Acrodus leiopleurus, L. Agassiz, Poiss. Foss. vol. iii. p. 145, 
pi. xxii. fig. 5. 
1887. Acrodus leiopleurus, A. S. Woodward, Geol. Mag. [3] vol. iv. 
p. 102. 
Type. Detached tooth ; Bristol Museum. 
A small, imperfectly known species, characterized by the con- 
