116 
ACTIXOPTERYGII. 
4078. Three caudal verlebrse erroneously referred to Tetrapterus 
minor by L. Agassiz, Poiss. Foss. vol. v. (1837-44), pt. i. 
p. 92, pi. lx a. figs. 11-13 ; Chalk, Lewes. See Part III. 
p. 406. Mantell Coll, 
25838. Three associated caudal vertebrae named Tetraptemis minor, 
Ag., by F. Dixon, Geol. Sussex (1850), p. xiii, pi. xxxi. 
fig. 16; Chalk, Sussex. Dixon Coll. 
The following imperfectly known genera and species may also 
perhaps be referred to the Chirocentridae, but there are no examples 
in the Collection:— >\ 
Andreiopleura vetustissima, 0. G. Costa, Atti P. Accad. Sci<v'^_^V 
Napoli, vol. ii. (1865), no. 16, p. 27, pi. ii. (quoted as ' 
A. esimia on p. 10).—Upper Cretaceous; Pietraroja, 
Prov. Benevento, Italy. [Imperfect trunk; Geological 
Museum, University of Naples.] 
^A^Coel/)gaster anolis, L. Agassiz, Neues Jahrb. 1835, p. 304 (name 
only).—Upper Eocene ; Monte Bolca, near Yerona. 
Pnjmnetes longiventer, E. D, Cope, Proc. Amer. Phil. Soc. vol. xii. 
(1871), p. 52.—Cretaceous or Tertiary; Tuxtla Chiapas, 
Mexico. [Nearly complete fish ; National Museum, 
Y^ashington.] 
The caudal region of a fish from the Cretaceous of Lesina, 
Dalmatia, which also seems to belong to the Chirocentridae, is 
described by F. Bassani, Denkschr. k. Akad. Wiss., math.-naturw. 
Cl. vol. xlv. (1882), p. 212, pi. xvi. 
INCERT^ SEDIS (? efiiitOeENTPTD.E). 
Genus TOMOGNATHUS, Dixon. 
[Geol. Sussex, 1850, p. 376.] 
A genus known only by the head, which is short and deep and 
much laterally compressed, with excessively shortened rostral region. 
Skull with a delicate median occipital crest extending as far for¬ 
wards as the back of the large orbit; cleft of the mouth horizontal, 
also terminating at a point opposite the hinder border of the orbit; 
dentigerous half of mandible slender, its hinder half deepened. 
Teeth hollow and conical, enamelled only in their distal half, and 
directly fused with the jaw, not implanted in sockets ; those of the 
premaxilla and the symphysial end of the dentary much enlarged, 
while those of the maxilla are relatively small, decreasing in size 
