260 CONTEIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
reaching to beyond its middle. Caudal peduncle rather stouter than in 
II. tergisns, and the fin not so deeply forked. Back less arched and 
snout blunter than in the other species, the mouth larger and more 
oblique. Pectorals longer and ventrals shorter than in H. tergisns, 
Belly carinated both before and behind ventrals. Bluish; sides silvery, 
with golden lustre. Head 4J; depth 3i. D. 9; A. 32; scales 6-56-7. 
Ohio Eiver to the Saskatchawan ; common northward. 
{Amphiodon alosoides Raf. .lourn. Pliys. Paris, 1819, 421; Hyodon chrysopsis Richard- 
son, Fauna Bor.-Amer. iii, 232, 1836: Hyodon clirysopsis Jordun, Bull. U. S. Nat. Mas. x, 
68, 1877: Hyodon amphiodon Raf. Ichtb. Oh. 1820, 42.) 
* Belly in front of ventrals not carinated; dorsal fin with 11 or 12 developed rays, 
t Belly behind ventrals carinated. 
433. II. tergiSMS Le Sueur. — Moon Eye ; Toothed Herring. 
Body oblong, moderately compressed. Eye large, 3 in head, the max- 
illary barely reaching its middle. Pectoral fins not reaching ventrals, 
the latter just short of vent. Belly behind ventrals somewhat carinate. 
Color silvery, olive-shaded above. Head 4J; depth 3. D. 12; A. 28; 
scales 5-55-7. L. 12 inches. Great Lakes and Mississippi Valley; 
abundant in our larger streams. One of our handsomest fishes; not 
valued as food. 
(Lc SucAir, Jonrn. Acad. Nat. Sci. Phila. i, 364, 1818: Hiodon clodalus Le Sueur, 1. c. 
367; Cyprinns (Abramisf) smithi' Jiich. Fauna Bor.-Amer. iii, 110; Gunther, vii, 375; 
Jordan, Bull. U. S. Nat. Mus. x, 68, 1877.) 
it Belly nowhere carinated. 
134. H. selenops Jordan & Bean. 
Body more elongate, little compressed, not elevated. Belly nowhere 
carinate. Eye very large, 2^ in head. Pectorals not reaching nearly 
to ventrals. Clear silvery. Head 4^; depth 4. D. 12; A. 27; Lat. 1. 
50. Cumberland Eiver and southward. 
(Jordan & Bean, Bull. U. S. Nat. Mus. x, 68, 1877.) 
Family XXXVI.— ELOPID^. 
{The Big-eyed Herrings.) 
Body elongate, not much compressed, covered with cycloid scales. 
Head naked. Mouth broad, terminal, the lower jaw prominent. Pre- 
maxillaries not protractile, short, the maxillaries forming the lateral 
margins of the upper jaw. Maxillary composed of about three pieces, 
extending backward beyond the eye. An elongate bony plate between 
the branches of the lower jaw (like the gular plate in Amia). Bands 
