CYrEINID-S. 
305 
Genus LEUCISCUS (Klein), Cuvier. 
[liegne Animal, vol. ii. 1817, p. 194.] 
I'remaxilHn protractile. Pharyngeal teeth smooth, conical or 
compressed, in a single or double series. No barbels. Pseudo- 
hranehiae present. Dorsal tin short, in middle of back, without 
^°ny spine ; anal fin short, behind the dorsal ; caudal fin forked. 
Scales large or of moderate size ; lateral line low on the flank, 
extending along the middle of the side of the tail. 
Leuciscus oeningensis, Agassiz. 
1708. Capita, J. J. Scheuchzer, Piscium Querelae et Vindiche, pi. iii. 
1755. Figure bv d’Argenville, Hist. Nat. eclaircie . . . Ory ctologie, 
pl. xviii. fig. 2. 
1818. Cyprinus jeses, II. D. de Blainville, Nouv. Diet. d'Hist. Aat. 
vol. x.vvii. p. 377 (errore). 
1832. Leuciscus oeningensis, L. Agassiz, Neues Jahrb. p. .. 
1835-39. Leuciscus oeningensis, L. Agassiz, l’oiss. Foss, vo . v. p . u. 
p. 24, pl. lvii. figs. 4, 5, pl. lviii. 
1839-44. Leuciscus laliasculus, L. Agassiz, ibid. p. 28, P • la - S i ' > 
[Distorted fish ; British Museum.] . 
1861. Leuciscus helveticus, T. C. Winkler, Descript. 1 oiss. Foss. 
d’Oeningen (Natuurk. Verhandl. Holland. Maatsch. [-] >° • xlv, '> 
p. 19, pl. iii. figs. 7, 9 (? fig. 6). [Imperfect fish ; Teyler Museum, 
Haarlem.] 
1861. Leuciscus oeningensis, T. C. IV inkier, ibid. p. -0, pl. in. g* 
Type. Imperfect fish ; olim Lavater Coll., Zurich. 
species attaining a length of about 0’18. Length of head wit 
opercular apparatus somewhat less than the maximum depth ot the 
trunk, which is contained three times or slightly more in the tota 
length to the base of the caudal fin. Vertebra 18 or 19 in the 
abdominal, 16 in the caudal region ; 13 pairs of ribs, the hinder- 
most comparatively small. Pelvic fins, with about 9 rays, arising 
6l ‘ghtly in advance of the dorsal, which also comprises 9 rays, the 
foremost being a short spine, tho second articulated,^ the others 
I’oth articulated and divided distally ; anal fin with 12 rays, like 
those of dorsal ; caudal fin moderately forked. 
f'he differences in proportions noted l>y Agassiz between .oemn 
'jensis and the so-called L. latiuscvlus seem to be due to accidental 
distortion ; while the absenoc of the small hindermost pair of ribs 
in the former probably results from defective preservation. 
Form. Loc. Upper Miocene ; Oeningen, Baden. 
®I15. Very large distorted specimen. 
I 1 ART xv. 
X 
