in 



CALIFORNIA AOADEMV OK SCIENCES 



scales, ;is in P. ralifrirnum. There is no indication in mir s|)ecimens of blue streaks on the head, 

 but such n>ay well be present in the young. 



Head 3i to 3,>o in length; depth if to \\. P. XII, 14: A. II, 12. The lateral line traverses 

 ;o scales ( 19 in one s])ecimen); 26 or 27 scales in a series along tlie middle of the sides; 9 scales in a 

 series between lateral line and anus, 3 between lateral line ami front of ilorsal. There are fewer 

 accessory scales on top of head than in P. rcdifrieniim. 



The ])reoperciilar niari^iii is sharply serrate to or slightly i)elow the angle; the horizontal limb 

 is smooth. Preorbital sharply serrate with slender retrorsely curveil spines, which occur as far forward 

 ;is the angle of the mouth, or slightly beyond that point. 



The jireorhital is narrower than in P. rfcti/rcenum, its greatest width, opposite angle of 

 mouth, equaling two-thirds diameter of orbit. 



The soft dorsal and anal fins contain constantly 14 and 12 rays, the last sjilit ray being counted 

 as one. Thirteen specimens have been e.xamined as to this |)oint. P. reel i/nni urn has constantly one 

 more ray in the dors;il and anal. The soft dorsal and anal tins are pointed in all our specimens, 

 whereas they are bluntly rounded in P. reeti/recnum. The ventrals have the outer ray filamentous, 

 e.xtending beyond the vent, usually exceeding the length of the pectoral lin, and equaling the length 

 of the head. 



The species is abundant among reefs and islands in Panama Bay. A single 

 specimen was secured at Acapulco. 



We take pleasure in naming this species for Dr. Theodore Gill, to whom is 

 due much of our early knowledge of Panama fishes. 



Measurements in Htindredtlis of Length ivithout Caudal. 



Length u ithout caudal expressed in mm 



Head 



Depth 



Orbit 



Interorbital 



Preorbital at end of maxillary 



Longest dorsal rays 



Longest anal rays 



Length of pectoral 



Length of ventral 



Upp)er lobe of caudal 



Height of caudal peduncle 



Scales along middle of body 



83 



34 

 54 

 10 



lO 



6 



28 



27 

 30 

 32 



31 

 16 

 26 



264. Pomacentrus flavilatus Gill. 

 Not seen by us; recorded by Boulenger (1899, p. 3) from the Gulf of Panama. 



