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 Fimdulus 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. 



Pceeilia olivacea Stor., 18i5, P. B. N. H. Soc, II, 51, — 1846, Sjq., 178, — Mem. Am. Ac, II, 430. 



Fundulus ienellus B. & G., 1853, P. Pliil. Ac, 389. 



Zygonectes tenellus Grd., 1859, P. Phil. Ac, 60; Blk., 1860, Cypr., 485. 



Zygonectes olivaceus Ag., 1854, Am. Jour., XVII, 353, — Fish Tcan. lliv., 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. Teun. 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. 111. Lab., I, 42 ; Jor. & C, 1877, B. Buf. Soc, III, 142 ; Jor., 1877, 

 B. 9 U. S. Mas., 47, — 1878, B. 111. Lab., I, No. 2, p. 52,-1878, Man. Vert., 264, — 1878, B. U. S. G. 

 Surv., IV, 411, 433,-1887, R. U. S. F. Com., 837; Jor. & B., 1878, B. 12 U. S. Mas., 62, 77; Forb., 

 1878, B. 2 111. Lab., 78, 85,-1883, B. 6 111. Lab., 71, 93,-1890, B. 111. Lab., II, 499 ; Cope, 18S0, B. 

 20 U. S. Mus., 34; Hay, 1881, P. U. S. Mus., Ill, 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, 12, 14, 

 16, 17, 19, 21; Everm. & F., 1885, P. Phil. Ac, 412 ; Hensh., 1888, Cin. Soc. N. H., 79 ; Everm. & J., 

 1889, P. U. S. Mus., XI, 43, 53, 56 ; Gilb., 1889, P. U. S., Mus., XI, 609, — 1891, B. U. S. F. Com., IX, 

 150, 155 ; Garm., 1890, B. lU. Lab., Ill, 141, — 1894, B. Ess. Inst., XXVI, ext. p. 47 ; BoUm., 1890, B. U. 

 S. F. Com., VIII, 223; Meek, 1891, B. U. S. F. Com., IX, 119, 128, 130, 134, 139, 140; Woolm., 1892, 

 B. U. S. F. Com., 251, 258, 261, 263, 271, 273, 274; Everm. & K., 1894, B. U. S. F. Com., 1892, pp. 78, 

 81, 83, 92, 107, pi. 24, fig. 4; Eig., 1894, R. Ind. Biol. Surv., 94. 



Fundulus aureus 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. 33-37; 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- 



