148 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY - IV. 



dd. Upper jaw protractile; teeth not molar. 

 e. Teeth two-rowed, 2 teeth in the lesser row. 

 /. Lateral line complete. 



g. Teeth subcouical, scarcely hooked, sharp-edged, wide apart, the long 

 limb of the pharyugeal bone elongate. 



PTYCHOCHILUS, 100. 

 gg. Teeth compressed, close-set, strongly hooked; the pharyngeal bone of 



the usual form. 



Ji. Caudal peduncle slender and elongate, the caudal fin widely forked, 

 its basal rudiments much developed; scales very .small ; 

 head depressed ............................. CII.A, 101. 



7i7i. Caudal peduncle stout; basal rudiments of caudal little developed. 



SQi'Ai.irs, 10-2. 

 ff. Lateral line incomplete ................................ Piioxixrs, 1U15. 



ee. Teeth one-rowed. 



- Lateral line complete. 



g. Mouth of moderate size ...... . .......................... LETJCO8, 104. 



gg. Mouth extremely small .......................... OPSOIMUUU s, 105. 



Lateral line incomplete; teeth serrate ............ TUYCII.KKHIHIX, 106. 



JJ. Abdomen behind ventral fins compressed to an edge, 

 the scales not passing over it ; anal basis usually elon- 

 gate ; dorsal posterior. 



i. Abdomen in front of vent rals rounded; anal basis rather long. 

 j. Teeth 5-5, with grinding surface and serrate edges. 



NOTKMICONTS, 107. 



jj. Teeth 2, 5-5, 2, entire, without grinding surface. Ai.Bntxrs, It is. 

 ** Dorsal (in short, posterior, with a strong spine, composed of two, the po>inior re- 



ceived into a longitudinal groove of the anterior; inner 

 border of the ventral tins adherent to the body; teeth 

 hooked, without grinding surface, in two rows. (1'ltnjo- 

 pterince.) 

 L Body with small scales ; teeth 2, 4-4, 2 ; no barbels. 



LEPIDOMKDA, 109. 

 II. Body scaleless. 

 m. Maxillary without barbel; teeth 1, 4-4, 1 ..... MI:DA, 110. 



mm. Maxillary with a barbel ; teeth 2, 5-4, 2. 



PLAGOPTKKTS, 111. 



** Dorsal fin elongate j dorsal and anal fins each preceded by a serrated spine; 



scales large; teeth molar; species introduced. (/'/- 

 priniiia}.) 

 TJ. Barbels 4 ; teeth 1, 1, :?-:?, 1, 1 ............... CYPKINTS. 



mi. Barbels none; teeth 4-4 .................. CAKASSIUS. 



71. CAITIPOSTOiTIA Agassi/. 



rollers. 



(Agas.si/, Amer. .loiirn. Sri. Arts, i -;,:,, v)]s : type L'ltlilu* i<aiii<iliix Raf.) 



I'.oily iii(Klcr;itfly cloii-atc, little compressed. Muiitli nnnii;il, the 

 j;iws with thick lips and rudiment of a hard sheath. Premaxilluries 

 protractile; no barbel. Teeth 4-4, or 1, 41, 0, with oblique grinding 

 .sin lace and but ;i slight hook on oiie or two teeth. Air-bladder sus- 



