THE CYPRINODONTS. 117 
behind the origin of the latter; fins similar in the sexes. Caudal very con- 
vex or pointed. Intestine short. 
This genus is so closely allied to Fundulus that separation is difficult. 
The most noticeable distinctive feature obtains in the backward position 
and the smaller size of the dorsal fin, smaller than the anal. From Haplo- 
chilus the genus is distinguished by lack of the expansion and production of 
the intermaxillaries and by the opposition of dorsal and anal. Zygonectes and 
Haplochilus have been thrown together by some authorities ; but a consist- 
ent adherence to such an estimate of the actual affinities would necessitate 
uniting both with Fundulus. 
North American. 
Zygonectes olivaceus. 
Plate I. Fig. 14, teeth; Plate X, Fig. 10-13. 
Pecilia olivacea Stor., 1845, P. B. N. H. Soe., II, 51, — 1846, Syn., 178, —Mem. Am. Ac., IT, 430. 
Fundulus tencllus B. & G., 1853, P. Phil. Ac., 389. 
Zygonectes tencllus Grd., 1859, P. Phil. Ac., 60; Blk., 1860, Cypr., 485. 
Zygonectes olivaceus Ag., 1854, Am. Jour., XVII, 353, — Fish Tenn. Riv., 15; Blk., 1860, Cypr., 485. 
Zygonectes zonatus Ag., 1854, Am. Jour., XVII, 353, — Fish. Tenn. Riv., 15. 
Zygonectes lateralis Ag., 1854, Am. Jour., XVII, 353, — Fish. Tenn. Riv., 15; Blk., 1860, Cypr., 485. 
Zygonectes pulchellus Grd., 1859, P. Phil. Ac., 113; Blk., 1860, Cypr., 485; Jor., 1874, Fish. 
Indiana, 32. 
Haplochilus pulchellus Gth., 1866, Cat., VI, 314. 
Zygonectes notatus Nels., 1876, B. Ill. Lab., I, 42; Jor. & C., 1877, B. Buf. Soc., ITT, 142; Jor., 1877, 
B. 9 U. S. Mus., 47, — 1878, B. Ill. Lab., I, No. 2, p. 52, —1878, Man. Vert., 264, — 1878, B. U.S. G. 
Surv., [V, 411, 433, — 1887, R. U.S. F. Com., 837; Jor. & B., 1878, B.12 U. S. Mus., 62, 77; Forb., 
1878, B. 2 Ill. Lab., 78, 85, — 1883, B. 6 Ill. Lab., 71, 93, — 1890, B. Ill. Lab., II, 499; Cope, 1880, B. 
20 U. S. Mus., 34; Hay, 1881, P. U. S. Mus., II, 501,— 1883, B. U. S. F. Com., 66, 74; Bean, 1882, 
B. U.S. F. Com., I, 206; Jor. & G., 1882, B. 16 U. S. Mus., 339, — 1887, P. U.S, Mus., IX, 5, 8, 19, 14, 
16, 17, 19, 21; Everm. & F., 1855, P. Phil. Ac., 412; Hensh., 1888, Cin. Soc. N. H., 79; Everm. & J., 
1859, P. U. S. Mus., XI, $3, 53, 56; Gilb., 1889, P. U. S., Mus., XT, 609, — 1891, B. U. S. F. Com., IX, 
150, 155 ; Garm., 1890, B. Ill, Lab., III, 141, — 1894, B. Ess. Inst., XX VI, ext. p. 47; Bollm., 1890, B. U. 
S. F. Com., VIII, 223; Meek, 1891, B. U.S. F. Com., IX, 119, 125, 130, 134, 139, 140; Woolm., 1899, 
B. U. S. F. Com., 251, 258, 261, 263, 271, 273, 274; Everm. & K., 1894, B. U. S. F. Com., 1892, pp. 78, 
§1, 83, 92, 107, pl. 24, fig. 4; Eig. 1894, R. Ind. Biol. Surv., 94. 
Fradulas aurens Cope, 1865, P. Phil. Ac., 78. 
Haplochilus aureus Gth., 1866, Cat., VI, 315. 
B. 5; D. 10-8; A. 12-10; V. 6; P. 14-15; LI. 33-87; Ltr. 11-10; 
Vert. 17+ 18. 
Body subfusiform in horizontal outline, depressed and flattened on head 
and nape, compressed from the head backward, deepest above the ventrals, 
moderately deep in the caudal pedicel. Head equal depth, one fourth of the 
length to the base of the caudal, depressed, as wide as deep. Snout wide, 
not deep, broadly rounded, little longer than the eye. Mouth wide ; man- 
