31. CYPEINID^. 147 



E. Lateral line incomplete. 



HEMITREMIA, 83. 



RE. Lateral line complete CLIOLA, 84. 



PP. Teeth 2, 4-4, 2. 



S. Lateral line complete.. MINNILUS, 85. 



SS. Lateral liiie incomplete ; scales 



small.PROTOPORUS, 86. 



OO. Mandible, iuteropercle, and suborbital with 



conspicuous, externally 

 visible, cavernous cham- 

 bers; teeth 1, 4-4, 0. 



ERICYMBA, 87. 



NN. Lower jaw with the lip developed as a fleshy 



lobe on each side ; teeth 

 4-4 ; dorsal anterior. 



PlIENACOBIUS, 88. 



LL. Maxillary with a small barbel at its extremity. 



U. Premaxillaries not protractile ; 



teeth 2, 4-4, 2; scales 



small ; dorsal posterior. 



EHINICHTHYS, 89. 



UU. Premaxillaries protractile. 



V. Teeth 4-4, or 1, 4-4, 1, or 1, 4-4, 0. 



W. Scales very small ; dorsal 



posterior. 

 X. Lateral line complete. 



AGOSIA, 90. 



XX. Lateral line incomplete. 

 APOCOPE, 91. 



WW. Scales large; dorsal me- 

 dian; lateral line com- 

 plete. 



CERATICHTHYS, 92. 

 VV. Teeth 2, 4-4, 2. 



Y. Head convex above ; 

 teeth without griudiug 

 surface ..COUESIUS, 93. 

 YY. Head flattened above ; 

 teeth with grinding sur- 

 face.. .PLATYGOBIO, 94. 

 KK. Teeth in the main row 5-5 or 4-5. 



Z. Maxillary with a bar- 

 bel ; preniaxillaries pro- 

 tractile. 



a. Teeth hooked, none of them molar ; teeth in the lesser row 2. 

 b. Caudal fin symmetrical, its rudimentary basal rays not greatly developed. 



c. Barbel- minute, lateral; teeth without grinding surface SEMOTILUS, 95. 



cc. Barbel terminal ; teeth with grinding surface S YMMETRURUS, 96. 



6&. Caudal fin unsymmetrical, the upper lobe much the longer, the basal caudal 



rays greatly developed POGONICHTHYS, 97. 



art. Teeth partly molar, much enlarged, obtusely truncate, lesser row with 2 teeth ; 



scales small MYLOCHILUS, 98. 



ZZ. Maxillary without 



barbel. 



d. Upper jaw not protractile; 2 or 3 teeth modified, molar ; teeth 2, 5-5, 2, or 2, 



5-4, 2 MYLOPHARODON, 99. 



