18 THE CYPRINODONTS. 
back, and the body cavity is rather short and deep. The head and body are 
covered with scales. The mouth is anterior, its upper margin is formed by 
the intermaxillaries, and its cleft varies from vertical to horizontal in the dif- 
ferent genera. The eyes are lateral. Teeth are borne on mandibles and 
intermaxillaries, in one to many series, and in cardiform groups on the upper 
and lower pharyngeals. A single dorsal, on the hinder portion of the body. 
Air bladder simple in the females, membranous, without ossicula. Alimen- 
tary tract short to long. No blind sac on the stomach. No pyloric append- 
ages. No adipose fin. No barbels. But few species possess pseudobranchie 
or vomerine teeth. 
The descriptions of a number of species lack the details of most impor- 
tance in comparisons ; in consequence it is not possible to satisfactorily place 
such forms in synopses. 
Teeth compressed ; 
anal not modified on the male; Pace 
jaws firmly joined; teeth fixed; CyPRINODONTINS 19 
cusps three ; 
series of teeth on each jaw one; 
body deep; intestine long Cyprinodon 19 
body elongate; intestine medium Lebias 29 
ventrals absent ; Tellia 35 
cusps two; body elongate ; 
series of teeth several Characodon 35 
intestine short; D. and A. long Girardinichthys 38 
series of teeth two Neolebias 39 
anal modified, without a tube; teeth chisel or 
oar-shaped, hooked Pecinz 40 
anal process long ; 
teeth chisel shaped, broad ; 
jaws firmly joined, teeth fixed Glaridodon 40 
jaws loosely joined 
teeth movable Girardinus 45 
anal process short 
jaws loosely joined ; teeth movable 
series of teeth on each jaw one Platypecilus 48 
series of teeth several 
D. long; body short Mollienisia 49 
D. short; body short Pecilia 52 
caudal of male sword-shaped Aiphophorus 67 
anal modified, with a tube; 
pupil entire ; pelvis entire JENYNSIINE 69 
males rights and lefts Jenynsia 69 
Teeth conical, in bands ; 
anal modified, with a tube ; 
pupil divided; pelvis divided ANABLEPINE 70 
males and females rights and lefts ’ Anableps 70 
