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OLIGOPLETJRID.®. 
493 
deeper than long, the others mostly as long as deep. Pelvic fins 
arising midway between the pectorals and the anal; dorsal fin 
scarcely larger than the anal, and arising slightly in advance of the 
latter. 
Form. Sf Loc. Lower Kimmeridgian (Lithographic Stone) : Cirin, 
Ain, Prance. 
Not repres^^rl in fihA Pnllection. 
Oligopleurus vectensis, A. S. Woodward. 
1890. Oligopleurus vectensis, A. S. Woodward, Proc. Zool. Soc. p. 346, 
pi. xxviii. fig. 1 (F pi. xxviii. figs. 2-4, pi. xxix. figs. 1-3). 
Type. Skull with anterior vertebrae ; British Museum. 
A species attaining a size at least twice as large as the type, 
known only by the head and anterior vertebrae. The vertebrae are 
much deeper in proportion to their length than those of 0 . esocinus. 
Form. Sf Loc. Wealden : Isle of Wight. (?) Purbeckian : Dorset¬ 
shire. 
42013. Type specimen, described and figured loc. cit. ; Wealden, 
Isle of Wight. 
Purchased , 1870. 
42014. Fragmentary portions of head and anterior vertebrae in 
sandstone, noticed loc. cit. ; Wealden, Isle of Wight. 
Purchased, 1870. 
The undermentioned specimens from the Purbeck Beds of Swanage 
are only provisionally assigned to this species. The large dentary 
hone (No. 36083) seems to be comparatively shorter and stouter 
than that of the type specimen of O. vectensis; otherwise it is 
difficult to recognize any mark of specific distinction between the 
Wealden aud Purbeckian fossils. 
40433. Immature fish 0*2 in length, described and figured loc. cit. 
p. 349, pi. xxix. fig. 3. The length of the head with 
opercular apparatus is contained slightly more than four 
times, and the depth of the trunk at the pectoral arch 
nearly seven times in the total length of the fish. The 
origin of the dorsal fin appears to be exactly opposite to 
that of the anal, and these two fins are about equal in 
size. The caudal pedicle seems to have been relatively 
more slender than in O. esocinus. Cunnington Coll. (?). 
P. 4219. Imperfect head and anterior vertebrae, described and 
figured as Lepidotus minor by Agassiz, Poiss. Poss. vol. ii. 
pt. i. p. 269, pi. xxix c. fig. 12, assigned to Oligopleurus 
vectensis by the present writer, loc. cit. p. 346, pi. xxviii. 
