258 RECORDS OV THE ACSTRAMAN MUSEUM. 



//. Body scales ctenoid; jaws without canines Oxyeleolns. 



ee. Preoperculum with a spine at the angle Eleotiia. 



cc. Scales larger, less than 50 in a longitudinal row. 



g. Top of heail with bony crests Jhilis. 



gtj. Top of head without liony crests. 



h. Preoperculum with 2-3 strong spines Astoropterix. 



hh Preoperculum unarmed. 



i. Cheeks and opercles naked Phil ypnodon . 



ii. Opercles scaly, cheeks more or less scaly. 



j. Interorbital space scaly. 



it. Snout l)road, flat and depressed ; scales on upper surface of head enlarged ; 

 first dorsal usually with 6 spines Ophiocara. 



kk. Snout narrower, more convex ; scales on upper surface of head not enlarged ; 

 first dorsal wi th 7-9 spines Mog u mda. 



jj. Interorbital space naked. 



I. Scales smaller, 37- to ; body moderately elongate Gohiotnorphus. 



II. Scales larger, 27-35; body deeper Carassiops. 



Genus Ptereleotris, Ctlll. 



Ftereleotris, Gill, Proc. Acad.' Nat. Sci. Pliilad., 18G3, p. 270 (Eleolrix 

 microlepis, Bleeker). Id., Bleeker, Arch. Neerl., ix., 1874, p. 307. 



Body elongate, compressed, covered with minute cycloid scales, which 

 are sepai-ate anteriorly ; no lateral line. Head naked, short. Kye of 

 moderate size. Mouth moderate, very oblique, the lower jaw projecting ; 

 chin without barbies. Teeth in sevei-al rows in each jaw, with large 

 canines ; palate toothless. Tongue styliform. Gill-openings wide, isthmus 

 narrow, shoulder-girdle smooth. Pseudobranchiae present ; gill-rakei-s 

 long, slender, and numerous. Six dorsal spines and about 21) rays ; anal 

 opposite tlie doi-sal, with about 27 rays. Venti-als i/t. Some of the 

 caudal rays produced. Vertebrre about 2G. 



Ptereleotris microleims, lUeeher. 

 (Plate xxxvii., tig. 1.) 



Eleofris viicrolrp}!^, Bleeker, Nat. Tijdschr. Ned. Indie, xi., 185G, p. 102. 



Id., Giinther, Cat. Fish. Brit. Mus., iii., 1801, p. 132. Id., Giinther 



& Playfair, Fish. Zanzibar, 1806, p. 75, pi. ix., fig. 5. 

 Eleotriudes mirrulepis, Bleeker, Nat. Tijdschr. Ned. Indie, xvi., 1858, p. 212. 

 Ptereleotris microlepis, Bleeker, Versl. Akad. Amsterdam (2), xi., 1877, 



p. 103. 

 Eleotris elongata, AUeyne and Macleay. Proc. Linn. Soc. N.S.Wales, i., 



1877, p. 335, pi. xiii., fig. 1. 



D. vi/29; A. 27; P. 22; V. i/4 ; C. 15. Scales minute. Fcur 

 bi-anchiostegals. Vertebrie 26, including the hypural. 



Deptli 78 in the length to the hypni-al ; head 52 in the same. Kye 

 slightly longer than the snout, 37 in the head. Bony interoil)ital width 

 13 in the eye. Snout l^, deptli of caudal-peduncle 2 in the head. 



