CLUPEID^. 
147 
Head and trunk much laterally compressed and abdomen com¬ 
pressed to an edge. Maxilla robust and arched, with two supra- 
maxillary bones; mandible a little prominent, and gape not extending 
beyond the hinder border of the orbit; teeth rudimentary or 
absent. Preoperculum only slightly expanded; operculum and 
suboperculum deep and narrow; branchiostegal rays about 6 or 8 in 
number. Yertebree from 45 to 60 in number, the centra much 
constricted and strengther^ed with few longitudinal ridges. Paired 
fins of moderate or small size; dorsal fin small and short-based, 
opposed to the pelvic pair ; anal fin with less than 30 rays; caudal 
fin deeply forked; no fin-rays excessively elongated. Scales of 
moderate or large size, not pectinated; a series of thickened 
ridge-scales, with ascending lateral wings, extending along the 
ventral border from the pectoral arch to the origin of the anal fin ; 
no dorsal ridge-scales; lateral line inconspicuous. 
Clupea scheuchzeri, Blainville. 
1708. Figure by J. J. Scbeuchzer, Querelse Pisciiim, pi. ii. 
1755. Figures by G. W. Knorr, Samml. Merkwiirdigk. Natur, pi. xxi. 
figs. 2, 3. 
1818. Clupea scheuchzeri, H. D. de Blainville, Noiiv. Diet. d’Hist. Nat. 
vol. xxvii. p. 315. 
1818. Clupea megaptera, H. D. de Blainville, ihid. p. 315. 
1886. Meletta scheuchzeri, A. Wettstein, Fischfauna Tertiaer. Glarner- 
schief. (Denkschr. schweiz. Palaeont. Ges. vol. xiii.), p. 52, pi. i. 
fig. 4, pi. iii. figs. 6, 8, 10, (?) pi. viii. fig. 6. 
Type. Imperfect fish; Paris Museum of Natural History. 
A species of slender proportions, attaining a length of about 0'25, 
but not satisfactorily definable on account of imperfect preservation. 
Abdominal vertebrae about 22, caudals 24 in number. Length of 
head with opercular apparatus somewhat exceeding the maximum 
depth of the trunk and equalling one quarter of the total length to 
the base of the caudal fin. Dorsal fin with about 12 rays, not 
extending behind quite so far as the middle point between the 
occiput and the base of the caudal fin ; pelvic fins arising opposite 
the middle of the dorsal, midway between the pectorals and the 
anal; the latter fin relatively small. 
If the specimens labelled Clupea megaptera by Agassiz are 
correctly determined, the type specimen described by de Blainville 
under this name must have been somewhat distorted and with 
incomplete dorsal fin. 
Form. Log: Oligocene : Canton Glarus, Switzerland. 
P. 3832. Fine specimen about 0‘13 in length, labelled Clupea 
L 2 
