prolonged, forming a beak. Both jaws with a band of conical 

 teeth and a series of moderate pointed widely-set teeth. Those 

 of the mandibles much smaller than those of maxillaries, which 

 are canines. Teeth on vomer present or absent. Dorsal and 

 anal almost opposite to each other; all the dorsal and anal 

 rays connected by a membrane. Caudal forked. Scales rather 

 small. Lateral line running low down, not forming a keel on 

 the caudal peduncle, which has sometimes a keel above the 



Fig. 46. Belone (Eurycaulus) pcrsimilis Gthr. X '/2- 

 Side- and upper view of end of tail to show that it is flattened. 



lateral line. Gillopenings wide. Gillrakers present. Lower pha- 

 ryngeal triangular, second and third upper pharyngeals denti- 

 gerous; fourth usually distinct, dentigerous. 



Distribution: East Atlantic, Indie and Tropical Pacific. 



This genus can be provisionally devided into the 

 following two subgenera: 



A. Vomerine teeth present; tail compressed Belone s. str. ! ). 



B. Vomerine teeth absent ; tail depressed Eurycau/us Og'ilby '*). 



Key to the i n do-australia n species of 

 the subgenus Eurycaulus: 



1. Eye i'/2 i 2 /s in postorbital part of head, equal 



to interorbital space B. (E.) platyura p. 118. 



2. Eye i 3 /5 2 in postorbital part of head, a little 



more than interorbital space B. (E.) pcrsimilis p. 118. 



1) Not represented in the Archipelago. 



2) We use here the name Eurycaulus^ although it was founded on a miscon- 

 ception. OGILHY (Proc. Royal Soc. Queensland XXI. 1908, p. 91) proposed to 

 subdivide the genus Tylosurus into three genera, and one of these genera he 

 called Eurycaulus, with the type B. platyura^ but lastnamed species, having 

 gillrakers, is a Belone and not a Tylosurus^ which fact seems to have escaped 

 OGILBY. The name Eurycaulus has presedence before Platybelone Fowler (Proc. 

 Acad. Nat. Sc. Philadelphia LXXI. 1919, p. 2). 



