FISHES OF THE PHILIPPINE ISLANDS AND ADJACENT SEAS 541 



U.S.N.M. No. 55602. Manila. Dr. E. A. Mearns. Length, 145 mm. 



U.S.N.M. No. 56334. Cavite. Luzon. G. A. Lung. Length, 277 mm. 



U.S.N.M. No. 58039. Zamboangn. Dr. E. A. Mearns. Length, 310-315 mm. 2 

 examples. 



U.S.N.M. No. 61667. Honolulu. C. L. Berndt. Length, 225 mm., deformed ex- 

 ample with body abnormally short. Depth 2%, 



U.S.N.M. No. 65798. Niau Island, Paumotus. Albatross collection. July 16, 

 1890. Length, 240 mm., caudal tips broken. Back with steel blue or blue- 

 green reflections, under surface whitish. 



U.S.N.M. No. 65799. Makemo, Paumotus. Albatross collection. Length, 210 

 mm. 2 examples. Back with blue-green reflections, otherwise largely silvery 

 white. 



U.S.N.M. No. 72273. Manila market. R. C. McGregor. Length, 310 mm. 



U.S.N.M. No. 72492. Batavia, Java. 1909. Bryant and Palmer. Length, 303 

 mm. 



U.S.N.M. No. 72493. Batavia, Java. Bryant and Palmer. Length, 220 mm., 

 caudal tips broken. 



U.S.N.^I. No. 82799. Fiji. U. S. Exploring Expedition. Length, 120 mm., 



U.S.N.M. No. 82895. Oahu. U. S. Exploring Expedition. Length, 160 mm. 



U.S.N.M. No. 83443. No locality. U. S. Exploring Expedition. Head, 45 mm. long. 



Family PTEROTHRISSIDAE 



Body oblong, elongate, belly rounded. Head narrow, oblong. Eye 

 large. Mouth narrow, upper jaw edge formed by premaxillaries 

 mesially and maxillaries laterally. Teeth minute, imbedded in thick 

 lips. Opercular apparatus complete. Gill openings wide. Pseudo- 

 branchiae present. Stomach with blind sac. Pyloric coeca numer- 

 ous. Air bladder with thick walls, ends in 2 short horns in front, 

 pointed behind. Head naked. Lateral line present. Dorsal long, 

 with numerous rays, little higher in front. Anal very small, pos- 

 terior. Caudal forked. Pectoral low. 



One living genus, also as fossil Istieus Agassiz from the Cretaceous 

 of Europe and Syria. 



Genus PTEROTHRISSUS Hilgendorf 



Pterothrissus Hilgendorf, Act. Soc. Leopoldina Carol., pt. 13, p. 127, 1877. 



(Type, Pterothrissvs gissu Hilgendorf, monotypic.) 

 Bathythrissa Gunther, Ann. Mag. Nat. Hist., ser. 4, vol. 20, p. 443, 1877. (Type, 



Bathythrissa dorsalis Giinther, monotypic.) 



Body rather slender, tapers gradually back from front of dorsal 

 to small slender caudal peduncle. Head large, with well-developed 

 mucous cavities on cheek. Snout long, conic, end blunt, projects 

 bej^ond mouth, with median ridge above. Eye median, high. Mouth 

 small, subterminally inferior. Maxillary with marginal row of very 

 small teeth. Orbital ridges project above sides of interorbital space. 

 Gill membranes united. Gill rakers short, stout, papillate or tuber- 



