69 



Height of the body is contained 4| times in the total length, and the 

 length of the head slightly more than 4 times in the same. The diameter 

 of the eye is one fourth of the length of the head, and equals the length 

 of the snout, and interorbital space. Interorbital space elevated into a 

 median crest. Lower jaw projecting beyond the upper ; the end of 

 the latter extends somewhat beyond the vertical from the anterior 

 margin of the eye. Breast scaly 9 lateral line scarcely bent ; scales be- 

 coming plate-like below the middle of the second dorsal fin. Pectoral 

 slightly longer than the head. Opercular spot distinct. 



Locality: Harbor of Honolulu, Oahu. 



On comparing this species with indubitable specimens of crnmen- 

 ophthalmus from the Atlantic, we find the following characteristic dif- 

 ferences. In the latter the eye is much larger — little over three times 

 in the length of the head ; the interorbital space is much more flattened ; 

 the end of the upper jaw extends further backward 3 and the pectoral 

 fin is shorter — -not equal to the head-length. A more important char- 

 acter, however, is in the shape of the interopercular bone. In mauri- 

 tianus it is very obliquely rounded, and the triangular space of the 

 isthmus is almost wholly exposed between the edges of the bones of the 

 oj)posite sides 5 in the Atlantic fish, on the contrary, the interoperculum 

 is nearly rectangular, and the inferior edges of the bones overlap along 

 nearly the entire extent of the isthmus, leaving but a very small space 

 of it uncovered at the angles, which are slightly rounded ; there is also 

 a broad, shallow notch on the posterior border of the bone. Cuvierand 

 Valenciennes, in their diagnosis of the species, direct attention to this 

 character, which seems to have been entirely overlooked by later ichthy- 

 ologists. 



C, hasselti, Gthr., is probably synonymous with this species. 



CAR ANGUS MELAMPYGCS, (C. & V.) Streets {No. 17980]. 



Caranx melampygus, Cuv. & Val., Hist. Nat. des Poies., ix, 1833, 116. — Gunther, Cat. 



Fish., ii, 1860, 446; Jour. Mus. Godeff., 1876, pt. xi, Fische der Sudsee, pt. v. 



133, pi. 86. 

 Caranx stellatus, Eyd. & Soul., Voy. Bouite, Poiss. 167, pi. iii, f. 2. — Gunther, Cat. 



Fish., ii, 1860, 436. 

 Caranx bixanthopterus, Rupp., N. W. Fische, 1837, 49, pi. 14, f. 2. — Klunzingek, Verh. 



zool.-bot. Ges., xxi, 187^^ Fisch. d. Eoth. Meer, 464. 



D. 8 -^ . A. 2-L. L. plates 36. 

 The number of rays in the anal fin did not vary in the five specimens 



