3. HEMIRHAMPHUS, 263 



a-h. Adult. St. Croix. Purcliased of Mr. Stevens. 



c. Half- grown : skin. Jamaica. Prora Mr. Parn ell's Collection. 



d. Adult, llio Janeiro. Presented by A. Fry, Esq. 



e-f, g~h. Adult. Pacific coast of Panama. From the Collections of 



Mr. 0. Salvin and Captain Dow. 

 i. Adult. 



Tc. Adult. Mauritius. From the Collection of the Z ological Society. 

 I. Adult. East-Indian archipelago. From Dr. Bleeker's Collection. 



One of the typical specimens of H. neglectus. 

 m-o. Adult. From the Haslar Collection. 

 J). Adult : skeleton. From the Haslar Collection. 



IlemirJutmphus picartl (Cuv. & Val. xix. p. 25 ; Guichen. Explor. 

 Alger. Poiss. p. 95, pi. 0. fig. 1), from the coaot of Algeria, must be 

 very closely allied to H. unifasciatus. 



6. Hemirhamphus gaimardi. 



? ? Hemirhamphus gaimardi, Cuv. ^~ Val. xix. p. 36. 

 Ilemirhamphus gaimardi, lileek. Nederl. Tyclschr. Dierk. iii., p. 158. 



melanurus, Bleek. Verh. Bat. Gen. xxiv. Snock. p. 19, and 



Nederl. Tydschr. Dierk. iii. p. 156. (not Cuv. i^ Val.). 



D. 15-16. A. 15-16. 



Very closely allied to H. unifasdatus. 



The length of the entire head is one-third of the total (without 

 caudal), the length of the lower jaw (beyond the extremity of the upper 

 jaw) one-seventh or one-sixth. The triangular part of the upper 

 jaw, formed by the intermaxillaries, is much broader than long. The 

 diameter of the eye equals the width of the interorbital space, and 

 is rather less than two-thirds of the length of the postorbital part of 

 the head. Prtforhital low and long, scarcely shorter than the diameter 

 of the eye. The root of the ventral fin is nearer to the eye than to 

 the base of the caudal. Dorsal and anal fins with thin scales ; the 

 fotmer a little longer than the latter. Caudal fin moderate ly forked, 

 the central rays being longer than the eye. Back dark greenish, 

 sides with a well-defined silvery band as broad as a scale. 



East-Indian archipelago ; New Guinea. 



a. Adult. From Dr. Bleeker's Collection, as H. gaimardi. 



b. Adult. From Dr. Bleeker's Collection, as Ji. melanurus. 



7. Hemirhamphus roberti. 

 Hemirhamphus roberti, Cuv. ^- Val. xix. p. 24. 



D. 15. A. 16. L. lat. 54. 

 The length of the entire head is contained twice and three- fourths 

 in the total (-Nvithout caudal), the length of the lower jaw (beyond the 

 extremity of the upper jaw) five times and a half. The triangular 

 part of the upper jaw, formed by the intermaxillaries, is as long as 

 broad. The diameter of the eye is rather less than the 'width of the 

 interorbital space, and contained once and two-thirds in the length 

 of the postorbital part of the hea^. The root of l)ie ventral fin is 



