40 aQtJAMIPlN>'E3. 



protuberance above each orbit, none on the neck. The upper sur- 

 face of the snout and a band between the orbits black. Body with 

 two broad black bands : the anterior from the firet four doraal spines, 

 touching the hind margin of the operculum, across the root of the 

 pectorals to the belly, including the ventrals, which are deep black. 

 The posterior band from the fifth, sixth and seventh dorsal spines 

 descending obliquely backwards, and occupj-ing the posterior half of 

 the anal fin ; the anterior half is black-edged. 



From the Mauritius thi'ough all the East Indian Seas to the N.W. 

 coast of Austraha. 



a. Large specimen : skin : not good state. Ceylon. From Dr. E. 



F. Kelaart's Collection. 

 h, c. Fine specimens. Amboyna. Purchased of Mr. Frank. 



d. Adult: skin. Port Essington. From Mr. Macgillivray's Col- 



lection. 



e. Half-gTown : not good state. Australia. 

 /. Adult. Purchased of Mr. Frank, 



g. Large specimen. Purchased of Mr. Frank. 



h. Adult. From the Haslar Collection. 



{. Adult. From the Haslar Collection. 



k-m. Adult. From the Collection of the Zoological Society. 



n. Adult : skeleton. From the Collection of the Zoological Society. 



0. Adult : skeleton. From Dr. A. Giinther's Collection. 



p. Half- grown : bad state : stuffed. 



q. Young : bad state. From the Haslar Collection. 



Skeleton. — The structure of the jaw-bones appeal's to be very 

 similar to that in Chcetodon. The limbs of the praeoperculum are 

 very indistinctly denticulated, and fonn together a somewhat obtuse 

 angle ; the interior ridge is slightly elevated, and has a distinct 

 muciferous channel posteriorly. The operculum is irregularly qua- 

 drangular, 2| as high as wide. The pra)orbital is oblong, the re- 

 mainder of the infraorbital ring very narrow, and not joined to the 

 praeoperculum ; the turbinal tubiform, of moderate length. The 

 anterior frontal bones are rather small. Each principal frontal has 

 an obtuse longitudinal ridge, exteriorly with a small groove ; there 

 is another larger cavity between the two ridges. The crown of the 

 skull is elevated, with a high and broad occipital crest, which, how- 

 ever, does not reach to the spurious intemeural spines. There are 

 two other crests on the side of the crown, on the inner of which is 

 suspended the suprascapula, the outer one being transformed into a 

 muciferous channel. The humeral is well developed and sword- 

 shaped : the radius and the coracoid form a very deep cavity. The 

 pubic bones are separated from each other by a narrow interspace, 

 and each is composed of four lamellae. 



There are ten* abdominal and fourteen caudal vertebrce, the first 

 being much compressed in its longitudinal diameter, so as to be 

 easily overlooked. The greater portion of the three anterior haemal 



* Cuvier states eight only. 



