238 SCOlIIiRESOCID-E. 



8. Belone angusticeps. 

 D. 10. A. 19. 



Tail strongly depressed, with a sharpish lateral edge ; body sub- 

 cylindrical. The length of the head is somewhat more than one- 

 third of the total (without caudal) ; it is narrow, elongate, rather 

 convex above, with a deep median longitudinal groove. Base of the 

 intermaxillaries depressed ; teeth very small ; maxillary half hidden 

 by the pra^orbital. The diameter of the eye is one-fourth of the 

 length of the postorbital part of the head, which is more than that 

 of the pectoral fin. Ventral fin somewhat nearer to the head than 

 to the caudal. The middle and hinder dorsal and anal rays subequal 

 in length, short, the last terminating at a considerable distance from 

 the root of the caudal. Caudal fin somewhat emarginate. Scales 

 very small. The termination of the caudal keel blackish. 



Coast of Ecuador. 



o. Eleven inches long. From Mr. Eraser's Collection. 



The following species appears to belong to this division : — 



9. Belone exilis. 



Girard, Proc. Acad Nat. Sc. Philad. 1854, p. 149, and U. S. Pac. 

 M. R. IJxp. Fish. p. 158. 



D. 16. A. 20. 



The length of the head is a little less than one-third of the total 

 (without caudal) ; body subcylindrical, very slender. Upper surface 

 of the head flat, with a longitudinal groove. Eye large, its diameter 

 being one-thiixl of the length of the postorbital part of the head. 

 The anal fin commences somewhat in advance of the dorsal, the 

 middle and hinder rays of these fins being short; ventral midway 

 between the eye and the caudal ; caudal fin moderately emarginate. 

 Scales very small above the lateral line, larger below it. (Gir.) 



San Diego, California. 



2. The free portion of the tail is moderately or slightly depressed, unthout 

 lateral edge; or the lateral line passes into a slight, generally black- 

 coloured keel. 



a. The posterior dorsal rays are more or less prolonged, the la.st extending 

 nearly or quite to the root of the caudal fin. 



10. Belone melanotus. 



Belone melanotus, Bleeker, Natuurk. Tydschr. Ned. Lid. i. p. 94, or 



Verh. Genootsch. xxiv. Snoek. Vissch. p. 14. 

 Mastacembelus crocodilus, Bleek. Ned. Tydschr. Dierk. iii.* (not syn.). 



D. 24-26. A. 22-24. 

 The free portion of the tail is subtetrahedral, scarcely higher than 

 broad, with a slight, narrow longitudinal keel along the side. The 

 length of the head is contained thrice and a sixth in the total (with- 

 out caudal) ; its i;pper surface flat, striated, without conspicuous 



♦ We have, at present, seen only a separate copy of tliis ]iaper, and therefore 

 are unable to refer to the pages. 



