546 
ACTIXOPTERYGII. 
^ S‘c^CLfUj»l 
y/ Eocene ; Ciiis. [Epper pharyngeal ; Eniversity of 
/' ( Lille.] 
jLahrodon trigoneHa : Diaphyodus trigonella, E. E. Schafliautl, 
Siid-bayerns Lett. Geogn. (1863), p. 246, pi. Ixv c. 
fig. 15.—Lp per ^ Eo cene; Bavaria. [The type species of 
j. The tooth from the Epper Eocene of Bavaria named Diajdiyodus 
H' ovalis by Schafhautl {op. cit. p. 247, pi. ixiv. fig. 3), seems to belong 
^ to Phyllodvs. 
\ 
\V~* 
Diaphyodus. Epper pharyngeal dentition.] 
Genns PHYLLODUS, Agassiz h 
i/ [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. Epper pharyngeal bones 
apparently fused together like the lower pharyngeals. 
Phyllodns toliapicus, Agassiz. 
1839-44. Phyllodus toliapicus, L. Agassiz, Poiss. Foss, vol, ii. pt, ii. 
p. 239, pi. Ixix a. figs. 1-3. 
1841. Phyllodus toliapicus, R. Owen, Odontogr. p. 138, pi. xliv. fig. 2. 
1866. Phyllodus toliapicus, I. 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 type species, with pharyngeal dental plate attaining an 
antero-posterior length of about 0*045. Four principal median 
teeth not much broader than long; surrounding teeth small and 
numerous. 
Form. Loc. Lower Eocene (London Clay): London Basin. 
21618. Fine convex (upper) plate; Sheppey. Purchased, 1850. 
38815. More imperfect specimen, noticed by Cocchi, loc. cit. p. 105 ; 
Sheppey. Boiverhank Coll. 
P. 3931-62. Four imperfect specimens, one (of concave or lower 
plate) described and figured by Cocchi, loc. cit. p. 106, 
pi. ii. fig. 9 ; Sheppey. EnnisTcillen Coll. 
The subgeneric name Paraphyllod,ush?iS, been proposed for those pharyngeal 
plates of this genus in which the rather small median teeth are surrounded bv 
numerous rows of lateral teeth (H. E. Sauvage, Bull. Soc. Geol. France [3] 
Tol. iii. 1875, p. 615). 
