3. MYXus. 407 



Snout broad, approaching in form that of a true Magil, with the 

 lower lip somewhat sharp. The prteorbital has a slight notch an- 

 teriorly, and has the margins serrated. The maxillarj- does not ex- 

 tend to below the orbit. The anterior dorsal has slender spines, and 

 commences a little nearer to the base of the caudal than to the snout ; 

 the posterior dorsal commences behind the anal. Caudal deeply 

 emarginatc ; vertical fins not scaly. A black spot superiorly in the 

 axil of the pectoral fin. 



2. Myxus harengus. 



D. 4 I -i-. A. ■^. L. lat. 38. 



A single series of small fixed teeth in the upper jaw, none in the 

 lower or on the vomer; lips thin. Praeorbital serrated anteriorly 

 and inferiorly. Anterior dorsal spines of moderate strength, half as 

 long as the head. 



Pacific coast of Central America. 



a-h. Twenty-two lines long. Collected by Captain Dow ; presented 

 by Dr. P. L. Sclater, Seer. Zool. Soc. 



Head and body compressed, the greatest depth being about one- 

 fifth of the total. The cleft of the mouth is rather broader than deep, 

 and does not extend to the anterior margin of the orbit. Sides and 

 belly bright silvery, back green. 



The two following species, perhaps, belong to this genus : — 



3. MyxTis curvidens. 



Mugil curvidens, Cuv. ^- Val. xi. p. 149. pi. 813. 

 D.4l|. A.f 



Teeth in both the jaws rather strong, in a single series, those of 

 the lower ha\'ing the points dii'ected doAvnwards, like the intermax- 

 illary teeth. Eyes without adipose membrane ; the maxillary is 

 entirely hidden by the praeorbital ; vertical fins not scaly ; no elongate 

 Bcales in the axils of the fins. Base of the pectoral blackish. ( Val.) 



Island of Ascension. Bahia. 



4. Myxus ciMlabis. 

 Mugil ciliilabis, Cuv. 8f Val. xi. p. 151. 



D.4||. A.f 



This species is thus described by Valenciennes : — It has the teeth 

 smaller and finer than M. curvidens, to which it is closely allied ; 

 they are less recurved downwards, but form a series of cilia which 

 have a different arrangement from that in the other species of Mugil. 

 The back is more straight, the body more rounded, the head shorter, 

 and the scales smaller than in M. curvidens. 



Lima. 



2h2 



