456 
Analysis of species 
a. Carencheli. Premaxillary and maxillary distinct- 
ly developed; gill openings 2 well separated in¬ 
ferior slits on pharynx. -- Derichthyidae. 
2 - - - -' r — rrr --- 
a * Premaxillaries and maxillaries not distinctly de¬ 
veloped. 
bl« Skin covered with rudimentary embedded scales, 
usually of linear form, arrahged in small 
groups obliquily at right angles to those of 
neighboring groups; tongue with free edges; 
hind nostrils before eyes; pectorals and ver¬ 
tical fins well formed, latter confluent 
t 
around tail. 
cl. Gill openings well separated; branchiostegals 
long, bent upward behind. 
d~. Gill openings lateral; snout conic; jaws not 
very robust; mouth cleft longitudinal; lips 
thick; teeth in villiform bands in jaws and 
on vomer. ------ Muraenidae. 
d2. Gill opening horizontal, inferior. 
el. Snout very blunt; jaws very strong; gape 
transverse; lips obsolete; teeth blunt, 
uni serial in jaws. ------Simenchelyidae. 
p 
e . Snout conic, slender; jaws moderately 
strong; gape lateral; lips obsolete; teeth 
acute, in bands in jaws and on vomer. 
Ilyophidae. 
