546 
ACTIN' OPTERY GIT . 
Eocene ; Cuis. [Upper pharyngeal ; University of 
Lille.] 
Labrodon trigonella : Diaphyodus trigonella, Iv. E. Schafhautl, 
Sud-bayerns Letb. Geogn. (1863), p. 246, pi. lxv c. 
fig. 15. — Upper Eocene; Bavaria. [The type species of 
Diaphyodus. Uppor pharyngeal dentition.] 
Ihe tooth from the Upper Eocene of Bavaria named Diaphyodus 
ovalis by Schafhautl (op. tit. p. 247, pi. Ixiv. fig. 3), seems to belong 
to Phjllodus. 
Genus PHYLLODUS, Agassiz '. 
[Poiss. Eoss. vol. ii. pt. ii. 1844, p. 238.] 
An extinct genus, known only by the pharyngeal dentition, which 
is compact, tritoral, and leaf-shaped, and exhibits a pile of 
successional teeth beneath each functional tooth ; middle teeth 
much larger than marginal teeth. Uppor pharyngeal bones 
apparently fused together like the lower pharyngeals. 
Phyllodus toliapicus, Agassiz. 
1839-44. Phyllodus toliapicus, L. Agassiz, Poiss. Foss. vol. ii. pt. »• 
p. 239, pi. Ixix a. figs. 1-3. 
1841. Phyllodus toliapicus, It. Owen, Odontogr. p. 138, pi. xliv. fig- -■ 
1866. Phyllodus toliapicus, 1. Cocchi, Ann. R. Mus. Fis. Firenze [2] 
vol. i. p. 104, pi. ii. figs. 8, 9, 15. 
Type. Convex (upper) pharyngeal plate ; Oxford Museum. 
The typo species, with pharyngeal dental plate attaining an 
antero-postcrior length of about 0-045. Four principal median 
teeth not much broader than long; surrounding teeth small and 
numerous. 
Form, t)" Loc. Lower Eocene (London Clay) : London Basin. 
21618. Fine convex (upper) plate ; Sheppey. Purchased, 1850. 
38815. More imperfect specimen, noticed by Cocchi, loc. tit. p. 105 ; 
Sheppey. Bowerbanlc Coll- 
P. 3981-62. Four imperfect specimens, one (of concave or lower 
plate) described and figured by Cocchi, loc. tit. p. 106, 
pi. ii. fig. 9 ; Sheppey. Ennisldllen Coll . 
1 The subgeneric name Paraphyllodus has been proposed for those pharyngeal 
plates of this genus in which the rather small median teeth are surrounded by 
numerous rows of lateral teeth (H. E. Sauvage, Bull. Soc. Gfeol. France [3] 
vol. iii. 1875, p. 615). 
