62 PROCEEDINGS OF THE ACADEMY OF [Jan , 



Color in alcohol dull brown above, pale or whitish below. Body over 

 most all of lower region washed with silvery- white. This also includes 

 mandible and side of head. Fins pale straw-brown, ventral and anal 

 paler or whiter. Iris pale brassy. Peritoneum pale. 



Length 9| inches. 



No. 11,334, A. N. S. P. One example from Rio Janeiro, Brazil. 

 Drs. Ruschenberger and Turner. 



This little-known form is well marked and easily distinguished from 

 0. sauriis by the longer maxillary and shape of the patch of vomerine 

 teeth. The form called palometa is said to have the posterior margin of 

 the infraorbital ring deeply concave. This is not true of my example, 

 as it has the posterior rim of the infraorbital nearly vertical. 



SERIOLIN.E. 



Naucrates ductor (LiniiEeiis). 



Gasierosteus ductor Linnii-us, Syst. Nat., Ed. X, 1758, p. 295. In Pelago, 



Satelles Sqiiali. 

 Naucrates ductor Bonaparte, Cat. Met. Pesc. Europ., Xapoli, 1S46, p. 72. 



Two examples llf and llf inches in length from the Mediterranean 

 show the following: Head about 4; depth 4^ to 4^; D. III-I, 25 and 

 26; A. II-I, 16; eye 5f in head; maxillary 3; interorbital space 2| 

 and 2^; pectoral about If; ventral 1| and If. Bonaparte Coll. Also 

 seven examples from the West Indies, ranging up to 4f inches in length. 

 The latter has: Head 3f ; depth 4f ; D. IV-I, 26; A. II-I, 15; eye 5 

 in head; maxillary 3; interorbital space 2y^^; pectoral 1|-; ventral If. 

 The others all more or less agree except that they l^ecome shorter and 

 the ventrals of the smaller examples reach the anus. It is 2y'V inches 

 in length and bears evidence of the Xystophorus stage in the presence of 

 prcopercular spines. The largest example noted above agrees per- 

 fectly with the large ^lediterranean examples in the posterior position 

 of the vent and the slender form of the body. The scales are decidedly 

 small, and approximate about 175 in a lateral series below the lateral 

 line to the base of the caudal. 

 Naucrates polysarous sp. nov. 



Head 3| ; depth 3i; D. V-I, 25: A. II-I, 16; P. in, 16; V. I, 5; 

 scales about 120 in a series directly below lateral line to base of caudal; 

 17? scales between origin of spinous dorsal and lateral line, and about 

 27? in a vertical series between latter and origin of soft anal; width of 

 head If in its length; depth of head 1^; snout 34-; eye 5; maxillary 

 3; interorbital space 2|; mandible 24; second dorsal ray about 2^; 

 least depth of caudal peduncle about 5; first anal ray about 2^; 

 pectoral (damaged) If; ventral If. 



