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single series of trenchant incisors in the jaws ; 
palate smooth. One dorsal fin, the spinous portion 
being the more developed ; anal with seven spines. 
Ventral fins thoracic ; pseudohranchise well- 
developed. 
“ Herhivorons fishes, inhabiting the tropical seas 
of the East Indian region, and the western parts of 
the Pacific.” 
Several Teutliis are found in the Australian seas, but I have 
not yet been able to procure any. 
ACEONUEIM. 
" Body compressed, ohlong or elevated, covered 
with minute scales. Lateral line continuous ; tail 
generally armed with one or more hony plates or 
spines, which are more developed with age, and 
frequently absent in very young individuals. Eye 
lateral, of moderate size. Mouth small ; a single 
series of more or less compressed, sometimes denti- 
culated, sometimes tapering, incisors in each jaw ; 
palate smooth. One dorsal fin, the spinous portion 
being less developed; anal with two or three 
spines ; ventral fins thoracic. Pseudohranchise 
well developed ; air-bladder present, forked poste- 
riorly. Intestines with more or less numerous cir- 
cumvolutions. 
“ Seas between the tropics. Herbivorous fishes.” 
Nota . — Acauthurus presents several sorts, particularly on the 
northern coasts of Australia, but it is not likely that any -will be 
found extending their habitat so far south as the Victorian Sea. 
