500 PROCEEDINGS OF THE ACADEMY OF [July, 



LEIOGNATHID^. 



61. Leiognathus edentulus (Bloch). 

 One example. 



CHANDID^.«» 



62. Ambassis wolffii Bleeker. 



One example. It agrees with Bleeker's figm'e/^ except that the mem- 

 branes of spinous dorsal and ventral fins are more dusky or blackish. 



63. Ambassis ambassis (Lac^pfede). 



Head 2\\ depth 2\; D. i, YII, I, 10; A. Ill, 9, i; scales about 2S in 

 lateral line to base of caudal; 4 scales obliquely back from origin of 

 spinous dorsal to lateral line; about 8 scales obliquely up from origin 

 of spinous anal to lateral line; about 12 scales before dorsal; snout 4^ 

 in head from tip of upper jaw; eye 3^; maxillary 2^ ; interorbital space 

 4|-. Rakers slender, a little longer than filaments or about equal to 

 diameter of pupil, and 8+17 in number. Color faded a plain pale or 

 nearly uniform brownish, all fins whitish. One example, 4 inches long. 



^Chanda is another of Hamilton's composite genera. Its elimination is as 

 follows : 



setifer =Gerres Cuvier, 1829. 

 ruconius =Leiognathus Laoepede, 1803. 

 nalua= Ambassis Ciivier, 1828. 

 nnma =HamiUoma Swainson, 1839. 

 phula=HamiUonia, Swainson, 1839. 

 bogoda =Hamiltonia Swainson, 1839. 

 bacxdis=Hannltonia Swainson, 1839. 

 ranga=HamUtonia Swainson, 18.39. 

 lala=Pseudambassis Bleeker, 1870. 



The first species affected is ruconius, which cannot belong to my own genus 

 Deveximentum if the original account and figure of Hamilton is correct. The 

 latter certainly represents a Leiognathus, and the description is equally applicable. 

 The second case is nalua which is an Ambassis. The third case is setifer which is a 

 Gerres. Haviiltonia was next proposed for orata, which is based on Hamilton's 

 figure of noma, by .Swainson, who follow? with another name, lata, for the same 

 figure! The remaining species appear to belong to this genus with the exception 

 of lala, for which Bleeker propcsed Pseudambassis in 1874. As this is the last 

 name used generically Chanda must supersede it with lala as the t}-pe. 

 Provisionally the genera may be distinguished by the following key: 

 a. — Preorbital entire; D. long, 14 to 17 radii; A. long, 16 to 18 radii; scales 



small or minute, Hamiltonia. 



aa — Preorbital denticulate. 



/). — Strong teeth in jaws, at least some of them enlarged and almost canine- 

 like. 

 c. — D. radii 12 to 14; A. radii 14 to 17; strong external series of pre- 



maxillary teeth, Chanda. 



cc. — D. radii 10 or 11; A. radii 9 to 11; outer series of teeth in part 



canine-like, Parambassis. 



. bb. — Teeth small, equal or subequal; D. and A. radii 8 to 11 ; scales large, 



A jyibassis. 

 Parambassis macrolepis (Bleeker) . 



One example in the Academy from the Paris Museum. The black on the edge 

 of the soft dorsal is very distinct. 



'''Atlas Ichth., VIII, 1876-77, PI. (47) 32.5, fig. 2. 



