206 REPORT OF STATE GEOLOGIST. 



h. Teeth usually 4-4. lutrensis, p. 210, 



hh. Teeth, 1, 4-4, 1. Dor.sal just behind ventrals. 



ivhipplei, p. 210. 

 aa. Teeth of main row, four ; of the inner row, two. 

 i. Anal rays, seven to nine. Dorsal over ventrals. 



j. Head short, five in length ; teeth with or without grinding 

 surface. hudsonius, p. 209. 



jj. Head in length, about four and one-third ; teeth with grind- 

 ing surfiice ; scales with exposed edges very narrow in 

 adults. megalops, p. 211. 



ijj. Head in length, four; teeth with or without griudiuH- sur- 

 face ; scales with exposed edges not so narrow. 

 k. Eye, three to four in length of head. 



heterodon, p. 207 ; jfjuniis, p, 208, 

 kk. Eye, two and two-thirds in length of head. 



ariomvius, p. 211. 

 ii. Anal rays, ten to eleven. Dorsal somewhat behind the ventrals. 

 1. Twenty to thirty scales in front of dorsal ; col 'rs often bril- 

 liant, ardens, p. 212. 

 11. About fifteen scales in front of dorsal; c ilors plain; sides 

 silvery, 

 m. Depth in length, less than five. rubrifrons, p. 213, 

 mm. Depth in length, more than five. atherinoides, p. 213. 



NOTROPIS MICROSTOMUS* ( Raf ). 



Gliola deliciosa, Jordan and Gilbert, 18H2, 8, 175; C straminea, op. 

 ciL, 167, Jordan, 1891, 4, 16. 



A minnow of small size (two and one-half inches) and usually of pale 

 color. The form is slender, the depth being c(mtained about five times 

 in the length. The mouth is spaall, nearly horizontal, and inferior, 

 being overpassed by the blunt snout. Teeth 4-4, with hook and 

 grinding surface. Eye in head about three. Lateral Hue coruplefe. 

 Scales, thirty-three to thirty-eight; twelve to fifteen rows in front of the 



"NoTROPis SCYLLA (N. PHENACOBTUS Forbes). Occurs from the Illinois River to the 

 Rocky Mountains. It resembles N. niirroitomus, but is said to have a stouter body and 

 shorter, bluntf-r head. Scales, 31-33 ; 14-15 in front of the dorsal. (Jordan ,',,1891, 16). Its 

 occurrence in Indiana is possible. 



NoTROPis Fretknsis (Cope) {Cliola freteusis, Jordan and Gilbert, 1882, 5, 167), has been 

 described by Prof. Cope from the Detroit River. It is stated to 5ccur rarely in Illinois. In 

 this species the body is slender, the depth being contained about five times in the length. 

 The mouth is terminal and oblique. There are thirty-five scales along the lateral line, and 

 seventeen in front of the dorsal. Head in length four, eye in head three and one-half. 

 The color is olive, with a leaden lateral streak ending on the tail in a dark spot. 



J 



