86 PROCEEDINGS OF THE ACADEMY OF 



produced snout and the reception of the lower jaw within the upper, as "well 

 as by the shorter and less emarginated caudal fin, greater height, &c. Several 

 specimens were obtained, mostly under an inch long. The description of the 

 dorsal and anal fins, as in Trachynotus rhodopus, refer only to the young. 



Trachynotus fasciatcs Gill. 



This species is closely related to the Trachynotus glaums of the Atlantic and 

 Caribbean Sea, but is distinguished by the scarcely gibbous snout and the 

 distribution of the vertical bands : the first commencing close in front of the 

 first (erect) dorsal spine ; the second between the fourth and fifth, and the 

 third under the fourth and fifth rays. A black spot also appears to exist on 

 the lateral line below the seventeenth dorsal ray, and a black blotch behind 

 the dorsal fin. The produced dorsal and anal lobes are nearly coterminal 

 with the caudal lobes. 



A single dried specimen, nearly eight inches long, was given to the Smith- 

 sonian Institution by Capt. John M. Dow. The snout is doubtless always less 

 gibbous than, or rather not vertical as in, T. glaucus. It cannot be the more 

 mature form of T. rhodopus or T. nasutus, as the snout, when it does change, 

 becomes more elevated with age. The colors are also quite different, and pro- 

 bably undergo no essential change with age. 



Family SPHYR^NOIDjE Ag. 



SPHYRiEXA LUCASANA Gill. 



The greatest height equals a tenth of the length, and is a quarter the thick- 

 ness. The head forms about three-tenths of the length. The snout enters 

 2\ times in the head, and is more than twice as long as the diameter of the 

 orbit ( - 05). The maxillary bone ceases at a vertical, whose distance from 

 the orbit equals the diameter of the pupil. The tip of the lower jaw has a 

 square, thick flap. 



The first dorsal fin commences more than four-tenths ( - 42) of the length 

 from the lower jaw ; its second spine rather exceeds the width of the body 

 (08) ; the second dorsal commences more than six-tenths (-62) from the jaw, 

 and is rather lower than the first ( - 07J). The caudal enters 6 times in the 

 whole length. 



The pectoral fin extends for about two-thirds of the distance between its 

 base and the ventral, and is less than of the length (-07). The ventral is 

 rather longer than the pectoral, and is inserted under the anterior margin of 

 the first dorsal. 



The first dorsal commences about over the thirty-fifth scale of the lateral 

 line, and the second over the ninetieth. 



D. IV. I. 8. A. 2. 9. 



Scales 134. 



The color is reddish-brown above the lateral line, and silvery below, with 

 darker blotches along the line. 



Family BERYCOID^E Lowe. 



HOLOCEXTRUM SCBORBITALE Gill. 



The greatest height does not equal a third (-31) of the total length ; the 

 tail behind the vertical fins nearly equals a ninth of the total length, and 

 nearly the length of the base of the rays ; its least height is rather less than 

 a twelfth (-08) of the same. The head, from the snout to the opercular 

 margin, forms more than a fourth ("26) of the length ; the opercular spine is 

 long, and nearly equals a third of the diameter of the eye ("03). The preo- 

 percular spine extends to the vertical from the base of the opercular one. 

 The diameter of the eye equals a tenth of the total length, and is a third 

 greater than the length of the snout (=-07). The preorbital has six or seven 

 moderate teeth, directed backwards. 



[Mar. 



