LEPT0LEP1 DiE. 
509 
P. 937. More fragmentary specimen labelled “ Leptolepis costalis ” 
by Egerton. Egerton Coll. 
P. 4364. Three imperfect specimens, one indicating a very large 
fish. Enniskillen Coll. 
Leptolepis dubius (Blainville). 
[Plate XIY. figs. 6, 7.] 
1755. Figures by G. W. Knorr, Samml. Merkwiirdigk. Natur, pis. xxiv., 
xxvii. 
1818. Clupea dubia , H. D. de Blainville, Nouv. Diet. d’Hist. Nat. 
vol. xxvii. p. 331. 
1826. Ichtkyolithus esociformis, E. F. Germar, Keferstein’s Teutschland 
geogn. dargestellt, vol. iv. p. 96. 
(?) 1826. Lchthyolithus luciiformis, E. F. Germar, ibid. p. 96, pi. i. a. 
fig. 1. 
(?) 1826. Esox avit'ostris, E. F. Germar, ibid. p. 95, pi. i. a. fig. 2. 
1833-44. Leptolepis knorrii , L. Agassiz, Poiss. Foss. vol. ii. pt. i. p. 13; 
pt. ii. pp. 134, 294 (in part). 
1833-44. Leptolepis dubius , L. Agassiz, ibid. pt. i. p. 13 ; pt. ii. pp. 134, 
294. 
(?) 1848. Tharsis germari, C. G. Giebel, Fauna d. Vorw., Fische, p. 146. 
[Nearly complete fish ; Halle Museum.] 
(?) 1848. Tharsis elongatus, C. G. Giebel, ibid. p. 147. [Ditto.] 
(?) 1848. Tharsis intermedius, 0. G. Giebel, ibid. p. 147. [Ditto.] 
1861. Leptolepis clupeiformis, T. C. Winkler, Descript. Poiss. Foss. 
Solenhofen (Natuurk. Verhandl. Holland. Maatsch. [2] vol. xiv.), 
p. 9, fig. 1. [Nearly complete fish; Teyler Museum, Haarlem.] 
1863. Leptolepis knorrii, A. Wagner, Abh. k. bay. Akad. Wiss., 
math.-phvs. Cl. vol. ix. p. 740. 
1888. Leptolepis knorri , K. A. von Zittel, Handb. Palseont. vol. iii. 
p. 271, fig. 277. 
Type. Nearly complete fish ; Museum of Natural History, Paris. 
A large and robust species, attaining a length of about 0’3. 
Length of head with opercular apparatus about equal to the maxi¬ 
mum depth of the trunk and one-fifth of the total length of the 
fish ; caudal pedicle comparatively narrow, its depth not exceeding 
one-third the maximum depth of the abdominal region. Vertebrae 
about 50 in number, the centra at least as long as deep and 
slightly strengthened by the addition of small longitudinal ridges of 
secondary bone ; neural and haemal spines in caudal region much 
inclined. Pelvic fins arising much nearer to the anal than to the 
pectorals, and comprising not less than 12 rays; dorsal with about 
15 rays, arising slightly in advance of the pelvic pair and not ex¬ 
tending so far as a point opposite the comparatively small anal, 
which comprises only about 10 delicate and closely-arranged rays; 
