CARPS. 835 
J. Teeth in the main row 4-4. & 
g. Maxillary without barbel. 
h. Teeth 4-4 or 1, 4 4, 1 or 0. 
4. Bones of head without cavernous chambers; lips thin; teeth with grind- 
ing surface, 
k. Lateral line complete. 5 3 6 6 : HUDSONIUS. 31. 
kk. Lateral line incomplete. . : : : ° . CHRIOPE. 32. 
hh. Teeth 2, 4-4, 2. 
%, Teeth without grinding surface; lateral line complete ; anal basis rather 
long. ° : : ° : 5 MINNILUS. 33. 
W. Teeth with grinding surface; lateral line complete. 
m. Dorsal fin inserted well behind ventrals; anal basis long (rays 10 
to 13). : ° : ; LYTHRURUS. 34. 
mm. Dorsal fin inserted over or a little behind ventral; anal basis short 
(rays 7 to 9). : : ° ° : ° . Luxiuus. 35. 
ié. Suborbital, interopercle and dentary bones much dilated, cavernous, 
crossed by mucous channels (readily seen by looking at the head of 
the fish from below ; teeth 1, 4-4, 0, : : ERICYMBA. 36. 
été. Lips thick, fleshy, the lower enlarged behind; mouth small, inferior; 
teeth 4-4, without grinding surface. . . PHENACOBIUS. 37. 
gg. Maxillary with a small barbel at or near its extremity (sometimes minute 
in Rkinichthys). 
n. Upper jawnot protractile; scalessmall; dorsal behind ventrals. 
RHINICHTHYS, 38, 
an. Upper jaw protractile. 
o. ‘Teeth 1,4-4, 1 or 4-4. 
p Teeth with grinding surface, 4-4; body elongate. . ErRimystTax. 39. 
pp. Teeth without grinding surface. . : . CKRATICHTHYS. 40. 
oo. Teeth 2, 4-4, 2, without grinding surface. ° » Coursius. 41, 
Sf. Teeth 2, 5-4, 2 or 1, or 2, 5-5, 2, without grinding surface. 
q. Maxillary with a minute, lateral barbel (ebscure or invisible in young speci- 
mens); scales moderate or large. ° ° : - SEMOTILUS. 42, 
.qq Maxillary without barbel; scales small. 
ry, Lateral line complete. : : : : TELESTES. 43. 
rr. Lateral line incomplete. : 5 ° : PHOXINUS. 44, 
tt Abdomen behind ventral fin compressed to an edge ; anal basis elongated. 
s. Teeth 5-5, with grinding surface; lateral line complete; anal rays 10 to 18. 
NOTEMIGONUS. 45. 
**Species introduced from Asia through Europe, with long dorsal fin preceded by a 
serrated spine. 
t. Barbels none. : : : : : 
tt. Barbels four. : 6 : - 
: CaARASsius. 46, 
: CYPRINUS. 47, 
GENUS 25. CAMPOSTOMA. Agassiz. 
Campostoma, AGASSIZ, Am. Journ. Sci. Arts, 1855, 219. 
Type, Rutilus anomalus, Rafinesque. 
Etymology, xampe, curve; stoma, mouth. 
