23. EQUULA. 4'J9 



the head -1-4^ ; the upper profile is angular, A pair of small spines 

 above the anterior margin of the orbit ; the cavity on the head is 

 subquadrangular, much broader anteriorly than posteriorly, its width 

 between the spines being 1| in its length. The lower prceopercular 

 margin is serrated, and its length is If in that of the mandibula. 

 The mandibula is very concave, and ascends at an angle of about 45°. 

 The length of the second dorsal spine is three-quarters of that of 

 the head. Scales very small, but conspicuous. The spinous dorsal 

 without black ; base of the pectoral brownish. 

 Red Sea ; East Indian (and Australian) Seas. 



a. Adult. Red Sea. 



h. Half-grown. Bengal. From the Collection of the East India 

 Company. 



c. Half- grown: bad state. Madras. Presented by T. C. Jerdon, 



Esq. 



d. Adult : bad state. Calcutta. From the Collection of Messrs. von 



Schlagintweit. 

 c. Fine specimen. Amboyna. Purchased of Mr. Frank. 

 /. Half- grown. India. Presented by G. R. Watcrhouse, Esq. 

 (f-i. ? Half-grown : half-destroyed. Aixstralia. Presented by Sir J. 



Richardson.- — Types of Eqmda serrulifera. 

 h. Adult. 



1, m. Half-grown : bad state. From the Haslar Collection. 

 71. Large specimen : skin. From Gronow's CoUeetion. 



3. Equula cabaUa. 



Scomber equula, Forsh. p. 58; Bl. Schn. p. 3G; SJiaw, Zool. iv. p. 596. 

 Centrogaster equula, L. (??«. p. 1337. 

 Ceesio equulus, Luccp. iii. pp. 85, 90. 

 Russell, pi. 62. 



Equula caballa, Cuv. i>c Val. x. p. 73 ; Riippell, N. W. Fische, p. 51 ; 

 Cantor, Catal. p. 146. 



B.5. D.± A.±. 



The height of the body is twice in the total length, the length of 

 the head 3|. A pair of small spines above the anterior margin of 

 the orbit. The lower pi-seopercular margin is finely serrated ; the 

 mandibida very concave. The length of the second dorsal spine 

 equals that of the head. Scales very conspicuous. The spinous 

 dorsal without black ; axil blackish. 



Red Sea ; East Indian Seas. 



I should not hesitate to consiaer this species as identical with E, 

 edentida or fj. dv^sumieri, H it were not for the greater length of 

 the head, expressly stated by Valenciennes. Stjll more doubtful is 

 the species described by Cantor as Equida caballa ; he says, that 

 the length of the nead is contained 3| in the total, but he takes 

 the latter from the snout only to the centre of the caudal margin. 

 The other character, taken by Dr. Cantor from the relative length 

 of the anal spines, is not of much value. The following specimen, 



2k2 



