31. CYPEINIDJE. 
147 
R. Lateral lino incomxilete. 
Hemitremia, 83. 
ER. Lateral line comx)lete Cliola, 84. 
PP. Teeth 2, 4-4, 2. 
S. Lateral line comxilete..MiNNiLUS, 85. 
SS. Lateral line incomi)lete ; scales 
siuall-PROTOPORUS, 86. 
00. Mandible, interopercle, and snborbital with 
conspicuous, externally 
visible, cavernous cham- 
bers; teeth 1, 4-4, 0. 
Ericymba, 87. 
NN. Lower jaw with the lij) develoi^ed as a fleshy 
lobe on each side ; teeth 
4-4 ; dorsal anterior. 
Phexacobius, 88. 
LL. Maxillary with a small barbel at its extremity. 
U. Premaxillaries not jirotractile ; 
teeth 2, 4-4, 2; scales 
small ; dorsal posterior. 
Ehinichthys, 89. 
UU. Premaxillaries ijrotractile. 
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 incomi)lete. 
Apocope, 91. 
WW. Scales large; dorsal me- 
dian; lateral line com- 
X)lete. 
Ceratichthys, 92. 
VV. Teeth 2, 4-4, 2. 
Y. Head convex above ; 
teeth without grinding 
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; premaxillaries pro- 
tractile. 
a. Teeth hooked, none of them molar ; teeth in thelesser row 2. 
h. Caudal fin symmetrical, its rudimentarj'^ basal rays not greatly develoxied. 
c. Barbel minute, lateral; teeth without grinding surface Semotilus, 95. 
cc. Barbel terminal ; teeth with grinding surface Syji jietrurus, 96. 
Z>5. Caudal fin unsymmetrical, the upper lobe much the longer, the basal caudal 
raj^s greatly developed Pogonichthys, 97. 
aa. Teeth partly molar, much enlarged, obtusely truncate, lesser row with 2 teeth ; 
scales small Mylochilcs, 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 Mylophakodon, 99. 
