134 



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 ; pseudobranchise well- 

 developed. 



" Herbivorous fishes, inhabiting the tropical seas 

 of the East Indian region, and the western parts of 

 the Pacific." 



Several TeutMs are found in the Australian seas, but I have 

 not yet been able to procure any. 



ACEONURIim 



"Body compressed, oblong or elevated, covered 

 with minute scales. Lateral line continuous ; tail 

 generally armed with one or more bony 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. Pseudobranchise 

 well developed ; air-bladder present, forked poste- 

 riorly. Intestines with more or less numerous cir- 

 cumvolutions. 



" Seas between the tropics. Herbivorous fishes." 



Nota. — Acautliurus 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 Yictorian Sea. 



