37G CONTRIBU'flONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
183.— IIE:TIIUIIA:TIPIIUS Cuvier. 
llalf-heal:s. 
(Cuvier, R^>^uc Auim. ii, 1817 : typo Ilemirhamphits commersoni Cuvier.) 
I5o(ly elongate, compressed, the dorsal outline i)arallel with that 
of the belly. Upper jatv short 5 lower jaw prolonged into a slender 
beak, bordered with membrane; iiremaxillaries forming a triangular 
plate, the teeth of which fit against the toothed portion of the man- 
dible; maxillaries joined to i)remaxillaries. Teeth feeble, sometimes 
tricusi)id. Gill-rakers rather long. Head covered above with large, 
shield-like scales. Scales large, deciduous. No tinlets; caudal fin 
more or less forked, the lower lobe the longer; dorsal and anal similar, 
not modihed in the males. Oviparous. Air-bladder large. No pyloric 
cuica. Young with the lower jaw short. Species numerous, in all warm 
seas, going in large schools. Size comparatively small, half ; 
beak.) 
a. Pectoral fills short; ventrals moderate. (Ilemirhannihus.) 
003. IB. iiaiaTnsciatits Rauzaui. * 
Greenish, sides with a well-defined silvery band, narrower than the 
eye, about as broad as a scale. Tip of lower jaw red. Lower jaw (from 
end of upjter jaw) 4.|-5.J in total length from its tip to base of caudal. 
Head (without mandible) 4^ in length from tip of upper jaw. Pre- 
maxillaries broader than long. Eye about equal to interorbital space, 
§ postorbital i)art of head. Ventrals nearly midway between eye and 
base of caudal. Dorsal and anal scaly. Caudal moderately forked, the 
middle rays being longer than the eye. P>ack not compressed. Head 
(with lower jaw) 2^-3; depth 74. D. 14; A. 15; Lat. 1. 54. L. 12 
inches. Cape Cod to Panama and Indian Ocean ; common on our 
South Atlantic coast. 
(Rauzaui, Nov. Comm. Acad. Sci. Inst. Bonou. 1842, v, 326, tab. 25; Guuther, vi, 
262: lleinirltamphus richardi Cuv. et Val. xix, 26. ) 
601. II. rosa; Jordan »S: Gilbert. 
Green, with a silvery lateral band, rather broader than a scale. A 
triple vertebral streak. Lower jaw dark reddish brown. Lower jaw 
(from tip of upper) 44 in length from its tip to base of caudal. Head 
without mandible 3* in length from tip of upper jaw. Premaxillaries 
about as broad as long. Eye less than interorbital space, about half 
pystorbital part of head. Ventrals rather nearer tip of caudal than 
eye, midway between base of caudal and gill-opening. Dorsal and anal 
