Jordan and Evennann. — Fishes of North America. 3157 
aa. The eye a vestige, not functional; vitreous body and lens mere vestiges, the eye col- 
lapsed, the inner faces of the retina in contact. Maximum diameter of eye 
about 200/i. 
d. Xo scleral cartilages, no pigment in the pigment epithelium; a minute vitreal 
cavity; hyaloid membrane with bloodvessels; puijil not closed; outer nuclear^ 
outer reticular, inner nuclear, inner reticular, ganglionic, and pigment epi- 
thelial layers ditferentiated ; cones probably none ; no eye muscles. Maximum 
diameter of eye 180, u. Eye probably connected with brain throughout life. 
Typhlichthys, 322. 
Ad. Scleral cartilages present ; ijigment in the pigment epithelium; vitreal cavity 
obliterated, no hyaloid membrane; pupil closed; some of the eye muscles 
developed; no outer reticular layer; outer and inner nuclear layers merged 
into one. Eye in adult not connected with the brain, 
e. Pigment epithelium well developed; cones well developed; ganglionic cells 
forming a funnel-shaped mass through the center of tlie eye; pigmented 
epithelium over the front of the eye without pigment. Maximum diameter 
of eye about 200(u.. Ventral fins present. Amblyopsis, 323. 
ee. Pigment epithelium developed over the distal face of the eye, rarely over the 
sides and hack; no cones; nuclear layers mere vestiges; the ganglionic 
layer restricted to the anterior face of the eye, just within the pigmented 
epithelium. Maximum diameter of the ej'e about 85g. 2so ventral fins. 
Troglichthys, 322 (a). 
Page 744. To the syuouymy of Eucalia inconstans (Kirtland), acid the 
following : 
Gasterostens gymnetes, Dawson, Canadian Naturalist, Vol. iv, No. 5, October, 1859, 321- 
324, figs. 1-3, Montreal, Canada. (Coll. Prof. J. W. Dawson.) 
Page 789. Recent inve.stigations made by Dr. Jordan in certain fresh- 
water streams and lakes of Mexico resulted in the discovery of several new 
species of Atheriniche and new facts regarding other species : 
1157. ESLOPSARUM JORDAM (Wooliuan). 
Locality, Rio Verde, Aguas Calientes, Mexico. 
Two specimens of EsJopsarum jordani were collected, together with 
numerous individuals of E. arge. Chirosfoma hrere, Steindachner, is probably 
identical with E. jordani, as already supposed by ns. 
An examination of a number of species of Eslopsarum and of Chirosfoma 
shows that the number of vertebrte, in addition to the character of the 
scales, furnishes a distinguishing generic feature. 
• .Species. 
Vertebrse. 
Eslopsarum jordani 
38 
urge 
37 
Chirostoma humhohHianum 
44 
chajiaUe 
45 
promelas 
45 
diazi 
44 
crystalliiium 
44 
lermto 
44 
ocvtlane 
44 
Chirosfoma contains two verj' marked types of species. The one repre- 
sented by the typical species, Chirosfoma hinnboldfiaiiiim, has the flesh Arm 
