474 
ACT1N0PTERYGII. 
College of Surgeons, which were subsequently named Dictyodus 
destructor, Owen (Catal. Foss, llept. & Pisces Mus. Roy. Coll. Sing. 
1854, p. 1(51). These specimens exhibit large, low and broad teeth, 
much laterally compressed, and vertically striated at the base, and 
are too imperfect for satisfactory determination. The following 
specimen may perhaps belong to this genus and species : — 
36166. Imperfect jaws, each exhibiting a single scries of the 
characteristic large teeth flanked externally with a row 
of very small but similar teeth ; London Clay, Shoppoy- 
Purchased, i860. 
Genus SCOMBRAMPHODON, novum. 
Syn. Amphodon, 11. Storms (non Amphodus, Peters, 1872), Ann. Soe. 
G6ol. Belg. vol. xiii. 1887, Mlira. p. 265. 
An extinct genus known only by portions of skull, dentition, 
and vertebrie. Marginal teeth large and conical, not laterally 
compressed, in single series on premaxilla, in less regular series on 
dentary, which bears a supplementary external row of compara- 
tively small teeth ; minute clustered teeth on palatine. Dontary 
bone rapidly deepening behind the contracted but thickened 
symphysis. Vertebral centra not longer than deep, with two 
lateral pits. 
Scombramphodon benedeni. Storms. 
1887. Amphodon benedeni, R. Storms, Ann. Soc. Gtiol. Belg. vol. xWo 
M<5m. p. 205, pi. iv. 
Type. Associated portions of skull and vertebrae. 
The type species, with mandible probably about 0T5 in lengt • 
Large teeth strongly plicated at base, not much incurved at ape x » 
those of dentary in a regular series, firmly fixed in rather deep 
sockets. 
Form. <$• Loc. Middle Oligocene (Rupelian) : Rupclmondc, 
Belgium. 
Not represented in the Collection. 
Scombramphodon curvidens, Storms. 
1887. Amphodon curvidens, It. Storms, Ann. Soc. Gcol. Belg. vol. xiii., 
Mi$m. p. 266, pi. v. 
Type. Associated portions of dontary and premaxilla. 
Large teeth of dentary more incurved than in the typo species 
