﻿270 8IRENOIDEI. 



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. Paheontogr. 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 guilielmi, 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, O. Schlumberger (err ore), Bull. Soc. geol. 



France, [2] vol. xix. p. 707, pi. xvii. 

 (?) 1878. Ceratodus Icevissimus, L. C. Miall, Monogr. Siren. & Crossopt. 



Ganoids (Mon. Paleeontogr. Soc), p. 32, pi. v. fig. 2. [Dental 



plate ; British Museum.] 

 1886. Ceratodus kaupi, K. A. von Zittel, Sitzungsb. k. bay. Akad. Wiss. 



niath.-phys. 01. 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 flat. 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. Sf Loc. Upper Muschelkalk : Thuringia. Lettenkohle : 

 Wiirtemberg. (?) Upper Keuper : Worcestershire, England. 



Except when otherwise stated, the following specimens were 

 obtained from the Lettenkohle of Hoheneck, near Ludwigsburg, 

 Wiirtemberg. 



