LEPIDOSIKENIDiE. 
269 
Dental plates robust, attaining a length of about (H32, irregularly 
triangular; inner border obtusely angulated at a point near its middle. 
Denticles four in the mandibular dental plates, five in the palatine, 
the ridges rounded, separated by deep notches at the outer border, 
terminating abruptly and extending more than halfway to the inner 
angulation. 
Form. § Loc. Upper Jurassic : Colorado. 
Not represented in the Collection. 
Ceratodus capensis, A. S. Woodward. 
1889. Ceratodus capensis, A. S. Woodward, Ann. Mag. Nat. Hist. [6] 
vol. iv. p. 243, pi. xiv. fig. 4. 
A /*• 
Type. Dental plate ; British Museum. 
Dental plates thin, attaining a length of not less than 0-023, 
triangular in shape ; angulation of inner margin acute and placed 
near the posterior extremity. Denticles five or six, the ridges being 
acute, well separated by deep and wide notches and valleys, extend¬ 
ing within a short space of the inner angulation, gradually sloping 
to a point at the outer border, and very faintly marked with coarse 
cr emulations. 
Form. Sf Log. Upper Karoo Formation (Stormberg Beds) : Orange 
Free State, South Africa. 
P. 4807. Type specimen, wanting one or perhaps two anterior denti¬ 
cles ; Smithfield. By exchange, 1884. 
Ceratodus phillipsi, Agassiz. 
1838. Ceratodus philippsii, L. Agassiz, Poiss. Foss. vol. iii. p. 135, 
ph xix. fig. 17. 
1877. Ceratodus phillipsi, A. Crane, Geol. Mag. [2] vol. iv. p. 211. 
1890. Ceratodus phillipsi, A. S. Woodward, Proc. Geol. Assoc, vol. xi. 
p. 292, pi. iii. fig. 5. 
Type. Dental plate; -unknnwrn y*<<( - * 1 . 
Dental plates thin, attaining a length of about 0*02, almost trian¬ 
gular in shape ; angulation of inner margin acute and placed near 
the posterior extremity. Denticles four or five (? or six), the ridges 
being sharply rounded, well separated by deep notches and valleys, 
extending nearly to the inner angulation and terminating abruptly 
at the outer border. 
Form. <J- Log. Bathonian: Oxfordshire (Stonesfield Slate) and 
Northamptonshire (Great Oolite). 
