270 
SIKENOIDEI. 
Not represented in the Collection, unless the dental plate men¬ 
tioned below be a much abraded example from the lower jaw :— 
11164. Much abraded left lower dental plate, doubtfully ascribed to 
this species by L. C. Miall, Siren. & Crossopt. Ganoids 
(Mon. Palaeontogr. Soc. 1878), p. 32, pi. v. fig. 13; one of 
a series of sixty fossils entered “ from the Stonesfield Slate, 
Cornbrash,'and Forest Marble.” Mantell Coll. 
Ceratodus kaupi, Agassiz. 
1838. Ceratodus kaupii, L. Agassiz, Poiss. Foss. vol. iii. p. 131, pi. xviii. 
figs. 3, 4. 
1844. Ceratodus guiliehni , T. Plieninger, in Meyer & Plieninger’s Pal. 
Wiirttembergs, p. 86, pi. x. figs. 7, 8, 13. [Dental plates; Stutt¬ 
gart Museum.] 
1844. Ceratodus palmatus, T. Plieninger, ibid. p. 87, pi. x. fig. 9. 
[Ditto.] 
1844. Ceratodus kurrii, T. Plieninger, ibid. p. 87, pi. x. figs. 10, 11. 
[Ditto.] 
1844. Ceratodus weissmanni, T. Plieninger, ibid. p. 87, pi. xi. fig. 10. 
[Ditto.] 
1850. Ceratodus kaupii , E. Beyrich, Zeitschr. deutsch. geol. Ges. vol. ii. 
p. 160, pi. vi. figs. 1, 2. 
1852. Ceratodus kaupii , F. A. Quenstedt, Handb. Petrefakt. p. 187, 
pi. xiv. fig. 12. 
1862. Ceratodus runcinaius , C. Schlumberger ( errore ), Bull. Soc. geol. 
France, [2] vol. xix. p. 707, pi. xvii. 
(P) 1878. Ceratodus Icevissimus, L. C. Miall, Monogr. Siren. & Crossopt. 
Ganoids (Mon. Palseontogr. Soc.), p. 32, pi. v. fig. 2. [Dental 
plate; British Museum.] 
1886. Ceratodus kaupi, K. A. von Zittel, Sitzungsb. k. bay. Akad. Wiss. 
matli.-phys. Cl. p. 258, figs. 1-4. 
Type. Upper dental plate ; Stuttgart Museum. 
Dental plates thin, attaining a maximum length of about 0’055, 
triangular in shape; angulation of inner margin acute and often 
mesially placed, the two moieties of this margin being usually some¬ 
what arched ; coronal surface gently sinuous or fiat. Denticles four 
in the mandibular dental plates, five in the palatine, the ridges being 
low, sharply rounded, ending obtusely and separated by very deep 
notches at the outer margin, and extending at least halfway to the 
inner angulation. 
Form. Log. Upper Muschelkalk ; Thuringia. Lettenkohle : 
M urtemberg. (?) Upper Keuper: Worcestershire, England. 
Except when otherwise stated, the following specimens were 
obtained from the Lettenkohle of Hoheneck, near Ludwigsburg, 
Wiirtemberg. 
