SIXTY-TWO SPECIES OF FISHES FROM LAKE ERIE 
333 
1.4; depth behind vent, 1.0 millimeter. Myomeres, 21 to vent plus 16 behind. 
Dorsal concentration increased and position of anal evident; notochord turning 
upward and some caudal rays developed. 
Pigmentation. — A few large round chromatophores occur on top of head, and 
a broken double series on dorsal ridge. A lateral line series extends from above air 
bladder backward, and a ventral series from jugular region to caudal, becoming 
double behind vent. 
12.0-millimeter stage . — Total length, 12.0; standard length, 9.5; length to vent, 
7.0; length of head, 2.8; snout, 0.6; diameter of eye, 0.8; greatest depth before vent, 
Figure 37 . — Notropis deliciosus stramineus, 7.5 millimeters 
2.0; depth behind vent, 1.2; length to dorsal, 5.5; to anal, 7.2 millimeters. Myomeres, 
21 to vent plus 16 behind. Dorsal, 9; anal, 7; ventrals apparent immediately before 
first ray of dorsal (in N. atherinoides 4 myomeres before dorsal) ; caudal fully formed. 
Air bladder two chambered. 
Pigmentation. — Chromatophores are arranged generally as in the preceding stage, 
but they are larger and more conspicious. Chromatophores occur also on caudal. 
2S .6-millimeter stage. — Dorsal, 9; anal, 8; caudal deeply forked; ventrals inserted 
slightly before origin of dorsal. Total length, 28.6; standard length, 22.9; length to 
vent, 14.4; length of head, 6.4; greatest depth, 4.5; diameter of eye, 2.2 millimeters. 
Myomeres, 19 to vent plus 17 behind. Body little compressed; head rather broad, 
snout very obtuse ; mouth small, inferior, horizontal, lower jaw included. Character- 
ized by dusky lateral band, not continued forward definitely through eye. 
Pigmentation. — Heavy pigmentation occurs on upper jaw and over head, and is 
continued along dorsal aspect by 1 to 4 rows of round black chromatophores with small 
ones between. There is heavy marking around base of dorsal and behind dorsal. The 
chromatophores form a scalelike pattern to caudal. A few are evident on sides of 
head. The lateral line is marked irregularly by small light chromatophores to region 
of vent, then they become larger, blacker, and stellate. The ventral aspect is un- 
marked except for a double series of chromatophores posterior to vent. Pectorals, 
dorsal, and caudal are pigmented, but ventrals and anal are plain. 
