i84 REPORT OF NEW JERSEY STATE MUSEUM. 



pharyngeal enlarged, and fourth wanting or united to third. 

 Stomach siphonal, without pyloric appendages. Air-vessel sim- 

 ple, often wanting. Basis cranii simple. Sexes usually unlike, 

 fins largest in males, but in some species females are much larger 

 in size. Many are ovoviviparous, the young well developed at 

 time of birth. In these species sexes are very unlike, the anal 

 fin of male developed as an intromittent organ. Body covered 

 with rather large cycloid scales, which are adherent and regularly 

 arranged. Head scaly, at least above. Lateral line wanting or 

 represented by a few imperfect pores. Dorsal fin single, inserted 

 posteriorly, of soft rays only or rarely with a single spine or 

 rudimentary spinous dorsal. No adipose fin. Caudal not forked. 

 Pectorals inserted low. Ventrals abdominal, rarely wanting. 



Mostly fresh-water fishes of small size, though some occur in 

 the arms of the sea in warm regions, and difficult of determina- 

 tion. 



Key to the genera. 



a. FuNDUUN^. Teeth all pointed, none compressed, bicuspid or tricuspid. 

 h. Teeth in villiform bands or in at least one or more series. 



c. Origin of dorsal before that of anal, radii ii to 17. fundulus 



cc. Origin of dorsal behind that of anal, radii 7 to 11. zyconectes 



hh. Teeth uniserial ; origin of dorsal before that of anal ; mouth oblique. 



LUCANIA 



aa. Cyprinodontin^. Teeth incisor-like, notched, bicuspid or tricuspid. 



CYPRINODON 



Genus Fundulus Lacepede. 

 The Killi Fishes. ^ 



Key to' the species. 



a. Scales large, 31 to 38 in a lengthwise series. 



b. Female with 2 or 3 black horizontal stripes; male with about 12 

 dark cross-bars and a dorsal ocellus ; branchiostegals 6. majalis 



hh. Females nearly plain; males with many pearly spots, and dorsal 

 ocellus faint or wanting; branchiostegals 5. 



HETEROCLITUS MACROLEPIDOTUS 



aa. Scales small, 44 to 60 in lateral line. diaphanus 



