268 SCOMBBESOCID^. 



ono-third in the length of the postorbital part of the head, and equal 

 to the width of the interorbital space. The dorsal fin commences 

 before the anal ; ventrals inserted in the fourth sixth of the total 

 length, with the inner ray shortest ; caudal fin deeply forked. Sides 

 with a silvery band. 



Ea.st-Indian archipelago ; New Guinea. 



a. Half-grown. Erom Dr. Bleeker's Collection. 



18. Hemirhamphus eclancheri. 



Ciiv. &■ Val. xix. p. 51. 



D. 16. A. 13. 



The length of the lower jaw (beyond the extremity of the upper jaw) 

 is one-fourth of the total (with the caudal). Head narrow above. 

 Sides with a silvery band. {Vcd.) 



Marquesas Islands. 



19. Hemirhamplms russelli. 



Cuv. ^ Val. xix. p. 32 ; Cant. Mai. Fish. p. 247 (not Emsell). 

 D. 17. A. 13. 



The length of the head from the intermaxillaries is one-sixth of 

 the total (with the caudal) ; the length of the lower jaw, from the 

 apex to the angle of the mouth, slightly exceeds the length of the 

 head, varying from one-fifth to one-sixth of the distance to the point 

 of the lower caudal lobe. The diameter of the eye is one-fourth of 

 the length of the head. Caudal forked. The ventrals are placed 

 opposite the posterior third of the distance between the apex of the 

 intcrmaxiUarics and the root of the caudal. Bluish black above, 

 silveiy on the sides above the lateral line. (Cant.) 



Pinang ; Malayan peninsula ; Coromandel. 



20. Hemirhamphus gemaerti. 

 Cut: Sf Val. xix. p. 43. 



D. 13. A. 15. 

 The length of the lower jaw (beyond the extremity of the upper 

 jaw) is one-fifth of the total (with the caudal) ; the width of the inter- 

 orbital space equals the diameter of the eye. Dorsal and anal small 

 and low ; caudal but little forked. The lateral silvery band is very 

 broad. (Val.) 

 China. 



Hemirhamphus occipitalis, Gill, Proc. Acad. Nat. Sc. Philad. 

 1859, p. 148, founded on a specimen little more than 4 inches long, 

 may prove to be the same species : it is said to have a longer lower 

 jaw (one-fourth of the total length) ; but this measurement is taken 

 from the corner of the mouth. 



