272 
) . 
7 
SIRENOIDEI, 
rA^ 
Ceratodus runcinatus, Plieninger. 
]844. Ceratodus runcinatus , T. Plieninger, in Meyer & Plienino-er's 
Pal. Wiirttembergs, p. 86, pi. xi. fig. 8. 
1850. Ceratodus serratus , E. Beyrich, Zeitschr. deutscfi. geol. Ges. 
yol. ii. p. 163, pi. yi. figs. 3, 4. 
1852. Ceratodus runcinatus , F. A. Quensteclt, Handb. Petrefakt. p. 187. 
1871. Ceratodus runcinatus , A. Gunther, Phil. Trans, pi. xxxi. fm. 10 
pi. xxxiii. figs. 4-6. 
1890. Hemictenodus intermedins , 0. Jaekel, Sitzungsb. Ges. naturf. 
Freunde, pp. 4, 6, woodcut. [Dental plate ; Berlin Museum.] 
Type. Lower dental plate ; Stuttgart Museum. 
Dental plates thick and robust, attaining a maximum length of 
about 0*065, triangular in shape ; angulation of inner margin acute, 
placed close to the posterior extremity. Denticles fixe in the man¬ 
dibular dental plates, five and a small or rudimentary sixth in the 
palatine, ''very prominent and acute, much laterally compressed, 
separated by deep notches at the outer margin, and continuous with 
ridges extending almost or quite to the inner angulation. 
Form. Sf Log. Lettenkolile : Wiirtemberg. 
All the following specimens were obtained from Hoheneck, near 
Ludwigsburg:— 
(i.) Upper dental plates. 
28450. Specimen wanting first denticle. Purchased, 1853. 
38681. Two dental plates attached to bone, and six isolated ex¬ 
amples. 
40321. Broken specimen in matrix. 
P. 765 . Fine dental plate in matrix. 
Purchased, 1864. 
Purchased, 1867. 
Egerton Coll. 
(ii.) Lower denial plates. 
21228 e. Fine specimen figured by Gunther, loc. cit. pi. xxxi. fig. 10. 
Purchased, 4847. 
21228 d. Dental plate of which microscopical sections are figured 
by Gunther, loc. cit. pi. xxxii. figs. 4-6. Purchased, 1847. 
21228 c. Four specimens. Purchased, 1847. 
28450 a. Abraded specimen. Purchased , 1853. 
38661 a. Small abraded specimen, and a 
abraded. 
42846. Broken specimen in matrix. 
large dental plate less 
Purchased, 1864. 
Fan Breda Coll. 
