2. CAEANGIcnrHYS. 421 



the specific unity of Caranx trachurus. There are several strong- 

 crests on the upper surface of the skull : the occipital crest occupies 

 all the length of the skull, from the anterior extremity of the frontal 

 bones to the occipital joint ; a pair of lower crests on each side of 

 the crown, the interior proceeding from the superciliaiy margin, the 

 exterior from the posterior angle of the orbit. The praefrontals are 

 small, and situated in a depression before the orbit. The basal por- 

 tion of the brain-capsule is neither compressed nor swollen. The 

 maxillary becomes gradually -ndder behind, and has a narrow sup- 

 plementarj' bone which occupies its whole superior margin. The 

 maxillary is slender, with a triangular prominence behind, and with 

 the posterior processes rather short. The mandibula has a rudi- 

 mentary muciferous channel, with four pores leading into it ; there 

 is a wide free space between the dentary and articular bones. The 

 prseoperculum is rounded, wath the space between tlie edge and the 

 fiat interior ridge very wide ; many irregular pores indicate the pre- 

 sence of a rudimentary channel in its interior ; the lower Umb is 

 shorter than the jiosterior. The operculum is nearly twice as high 

 as wide, and has a small notch posteriorly and another superiorly. 

 The intcroperculum is larger than the suboperculum. 



The turbinal bones are compressed tubes of moderate length ; the 

 priEorbital is rather narrow, widest anteriorly ; the remainder of the 

 infraorbital ling is narrow, but widening behind. 



The suprascapula and scapula are feeble ; the humenis, with the 

 bones of the fore-arm, fonns a deep groove, the bottom of which is 

 nearly completely bony ; the radius has a wide ovate foramen. The 

 coracoid is broad, tapering inferiorly. Each of the pubic bones is 

 formed by three naiTow lamella, and terminates posteriorly in a 

 short and slender process. 



There are ten abdominal and fourteen caudal vertebrce, the length 

 of the former portion of the vertebral column being to that of the 

 latter as 1 : 1-7. Each vertebra has a deep lateral impression. The 

 neural and haemal spines are moderately long and strong, and inclined 

 backwards ; the interneui'als and interhjemals are feeble. The haemal 

 of the first caudal vertebra and the first interhaemal are united to 

 one strong bone, fonning the base for the anal spines ; it is veiy 

 sUghtly ciu'ved anteriorly. The ribs are of moderate strength, and 

 have slender epipleiu-al spines. 



2. CARANGICHTHYS. 

 Carangichthys, Sleeker, Celebes, iii. p. 760. 



Body compressed, elevated, covered with veiy small scales ; the 

 posterior portion of the lateral line foi-nished with plates, each of 

 which is anned with a hook. Prceoperciduni denticulated. Cleft of 

 the mouth moderate ; snout short, convex. Two dorsals, the first 

 with eight spines and with an anterior horizontal spine, directed 

 forwards. Two anal spines, separated from the soft portion ; finlets 

 none. Teeth in the jaws, on the vomer, the palatines, and on the 

 tongue. 8even branchiostegals. 



Sea of Celebes. 



