450 
ACTIXOPTERYGII. 
Head larger and trunk more slender ; dor¬ 
sal opposite pelvic fins; six deepened 
series of flank-scales, with fine serra¬ 
tions . hartmanni (p. 466). 
Length of head slightly less than maxi¬ 
mum depth of trunk, which is con¬ 
tained four times in total length; 
dorsal opposite pelvic fins; scales very 
finely pectinated and serrated, with 
inconspicuous lateral line . macrocephalus (p.467). 
Smaller and more slender, with smaller 
head. similis (p. 470). 
Maximum depth of trunk equalling one- 
third of total length ; dorsal opposite 
pelvic fins; scales very finely pectinated 
and serrated, with inconspicuous lat¬ 
eral line... gramdatus (p. 470). 
Smaller and probably more slender . ovatus (p. 471). 
Length of head much less than maximum 
depth of trunk, which is contained 
four times in total length ; dorsal 
opposite pelvic fins; scales coarsely 
pectinated, and lateral line a ridge on 
caudal region ... ornatus (p. 471). 
Smaller and more slender. micronyx (p. 473). 
III. Incertae Sedis, the dorsal fin opposed in great 
part to anal fin. 
Length of head equalling maximum depth 
of trunk and contained 4| times in 
total length ; four deepened series of 
flank-scales . greganus (p. 474). 
Smaller head; maximum depth of trunk 
one-third total length ; three deepened 
series of flank-scales . dubius (p. 474). 
Pholidophorus bechei, Agassiz. 
[Plate XII. figs. 1, 2.] 
1822. “ Fossil Fish,” H. T. De la Beche, Trans. Geol. Soc. [2] vol. i. 
p. 45, pi. vii. fig. 1. 
1844. Pholidophorus bechei , L. Agassiz, Poiss. Foss. vol. ii. pt. i. 
p. 272, pi. xxxix. figs. 1-4. 
1844. Pholidophorus onychius , L. Agassiz, ibid. p. 274, pi. xxxix. 
figs. 5-7. [Nearly complete fish ; Oxford Museum.] 
Type. Nearly complete fishes. 
The type species, attaining a length of about 0*2. Length of 
head with opercular apparatus somewhat less than the maximum 
