$2 CLASS IV. ORDER Ii. 
ened, directed upwards, retractile towards the 
head by means of a membrane; mouth without 
teeth ? branchiz three pair beneath the throat : 
fins, pectoral small, dorsal the length of the back, 
caudal short with spiny rays ; body very long, 
compressed. 
Tricuivurvs, (needle-tail,) head stretched for- 
ward, with lateral gill-covers; teeth ensiform and 
semisagittate at the tips ; gill-membrane 7-rayed ; 
body ensiform, compressed, with subulate, finless 
tail. 
Awnarcuicuas, (wolf-fish,) head rather obtuse ; 
fore-teeth, both above and below, conical, diverg- 
ent, strong, 6 or more in number ; erinders i in the 
lower j jaw and palate rounded ; gill-membrane 6- 
rayed ; body roundish ; tail-fin distinct. 
Xipaias, (sword- -fish,) head with the upper 
yaw terminating in a sword-form snout ; mouth 
without teeth ; gill-membrane 8-rayed ; body 
roundish, without scales. 
SrromatTeus, (stromat,) head compressed ;: 
teeth both in jaws and palate; body rhombic- 
ovate, compressed, lubriceus. 
STERNOPTRIX, (amber-fish, ) head obtuse ; mouth. 
abrupt ; teeth very minute; gill-membrane none ; 
body compressed, without visible scales ; breast 
carinate, folded both ways; abdomen pellucid. — 
ORDER 2. JUGULARES. 
Gill-membranes with bony rays ; ventral fins 
hefore the pectoral. 
_ Caxuionymus, (dragonet,) eyes vertical, ap- 
proximated ; gill-covers shut, with a small aper- 
ture on each side the neck ; ; gill- -membrane 6-ray: 
ed; body uaked ; ventral fins very remote.. 
