454 
ACTINOPTERYGII. 
18510-11. Much-fractured specimen in counterpart; Upper Lias, 
Ohmden, Wiirtemberg. The head with opercular appa¬ 
ratus is contained more than four times, and the maximum 
depth of the trunk much less than four times in the total 
length, which measures about O'15. The cranial roof and 
mandibular ramus are shown to he coarsely rugose. The 
dorsal fin is opposed to the pelvic pair. The scales are 
all smooth, not serrated, while those of the flank are 
much deepened. Purchased, 1844. 
P. 7579. More imperfect specimen, wanting the head; Ohmden. 
Egerton Coll. 
Pholidophorus latiusculus, Agassiz. 
[Plate XIV. fig. 3.] 
1832. Pholidophorus latiusculus, L. Agassiz, Neues Jalirb. p. 145. 
1833-44. Pholidophorus latiusculus , L. Agassiz, Poiss. Foss. vol. ii. 
pt. i. pp. 9, 287. 
1844. Pholidophorus fusiformis , L. Agassiz, ibid. p. 288 (name only). 
[Fish ; British Museum.] 
1850. Semionotus curtulus, 0. G. Costa, Atti Accad. Pontan. vol. v. 
p. 294, pi. vii. fig. 6 , pi. viii. fig. 2 (non pi. vi. figs. 4, 5). 
1853. Semionotus curtulus , 0. G. Costa, loc. cit. vol. vii. p. 9, pi. i. 
fig. 5. 
1866-67. Pholidophorus latiusculus, R. Kner, Sitzungsb. k. Akad. Wiss., 
math.-naturw. Cl. vol. liv. pt. i. p. 328, pi. iii. figs. 2, 3, and ibid. 
vol. lvi. pt. i. p. 903, pi. ii. fig. 1. 
1892. Pholidophorus latiusculus , F. Bassani, Mem. Soc. Ital. Sci. [3] 
vol. ix. no. 3, p. 23. 
Type. Xearly complete fish. 
A small species, attaining a length of about 0*08. Length of 
head with opercular apparatus at least equalling the maximum 
depth of the trunk, and occupying about one-quarter of the total 
length of the fish. The rugose ornament of the head and opercular 
bones feeble ; maxilla longitudinally striated. Pelvic fins arising 
considerably in advance of the middle point of the trunk, opposite 
the origin of the dorsal fin. Scales large and smooth, the hinder 
margin very slightly convex and not serrated; several flank-series 
deeper than broad. 
The small specimens of Pholidophorus from the Lower Lias 
of Lyme Regis, Dorsetshire, ascribed to P. latiusculus by Agassiz 
(1844) are now catalogued as young individuals of P. bechei {supra, 
p. 450). It may also be added that in the two first drawings 
