208 REPORT OF NEW JERSEY STATE MUSEUM. 
Gill-rakers long. Third upper pharyngeal on each side much 
enlarged, solidly united with its fellow to form an oval plate with 
slightly convex surface and covered with blunt tricuspid teeth. 
This about as large as united lower pharyngeals and fits into 
concavity of latter. Fourth upper pharyngeal wanting or grown 
fast to third. Lower pharyngeal large, thick, triangular and with 
concave surface. Air-vessel large, sometimes cellular. Vertebrz 
about 50. No finlets. Anal fin modified in viviparous species, 
unmodified in others, and usually similar to dorsal. Caudal fin 
rounded or forked, if forked lower lobe longer. 
Herbivorous fishes of warm seas, mostly along shore, though a 
few pelagic. Their food is mostly green alge, and like related 
forms swim at the surface, occasionally leaping into the air. Size 
rather small, usually about a foot in length. 
Key to the genera. 
a. Body moderately compressed; pectorals moderate; shore fishes. 
HYPORHAMPHUS. 
aa. Body very slender and compressed, more or less band-like; pectorals very 
long; pelagic fishes. EULEPTORHAMPHUS. 
Genus HyporHAMPHUS Gill. 
The Half Beaks. 
Hyporhamphus unifasciatus (Ranzani). 

Half Beak. Hyporhamphus unifasciatus (Ranzani). 
Head 2%; depth 8; D. m, 133 A.-111, 13; scales 53 an latenak 
series to base of caudal and 3 more on latter; 8 scales between 
origins of dorsal and anal; snout 234 in head measured from tip 
of upper jaw; eye 4; gape of mouth 4% ; interorbital space 4; pec- 
toral 124; base of dorsal 1%; base of anal 1% ; ventral 23; least 
depth of caudal peduncle 4. Body elongate, moderately com- 
