ADDENDA. 505 



Page 222. AMBASSIS. 



Add to the diagnosis : Scales deciduous, generally large ; in some 

 species very small. 



Page 255. Add a new genus of PERCIDJE : — 



54 a. LEMBUS*. 



Lateral line none. Branchiostegals six ; pseudobranchia? absent. 

 Eody subfusiform ; cleft of the mouth rather wide, with the lower jaw 

 longest. A band of villiforra teeth in the jaws and on the vomer ; 

 no canines or palatine teeth. Opercles neither serrated nor armed. 

 Two dorsals, the first with seven slender spines ; anal spines indi- 

 stinct. Scales rather small, ctenoid. Air-bladder present. 



Fresh waters of Ecuador. 



1. Lembus maculatus. 



B. 6. D. 7 I J. A. f. L. lat. 57. L. transv. 22. 



Yellowish, irregularly spotted witli blackish : back Avith five dark 

 cross-bars ; a black blotch behind the extremity of the operculum ; 

 three blackish streaks radiating from the eye ; the vertical fins dotted 

 with blackish. 



a. Andes of Ecuador. From Mr. Fraser's Collection. 



Description. — This fish is one of the most interesting additions 

 in the collections sent home by Mr. Fraser. It is a true repre- 

 sentative, in South America, of the Perches of the Arctic regions. It 

 offers, however, several modifications of the typical characters, the 

 most important of which appears to be the absence of the lateral 

 line. In general appearance it resembles Lucioperca, or some of the 

 other elongate Porches, its greatest height below the spinous dorsal 

 being one-fifth of the total length (without caudal f). The body is 

 rather thick, its greatest thickness between the opercles being five- 

 sixths of the height. The tail is compressed. The length of the 

 head is one-third of the total ; it is rather depressed, broad and flat 

 superioi'ly, the width between the orbits being 4| in the length 

 of the head, or 1|^ the diameter of the eye. The snout is pro- 

 duced, depressed, with the lower jaw longest, and with the cleft of 

 the mouth wide, the upper maxillary reaching nearly to below the 

 middle of the eye. There are two nostrils on each side, far apart 

 from each other : the posterior is near the upper angle of the orbit ; 

 the anterior is minute, and close to the upper extremity of the max- 

 illary bone. The eye is of moderate size, one-seventh the length of 

 the head, situated high up the sides, so that its margin interferes 



* Fi'om Xt;u/3os, a small, long, swift boat. 



t The eaudal fin is lost in the single specimen, which is otliorvvisc very well 

 preserved. 



