258 RECORDS OF THE AUSTRALIAN MUSEUM. 



ff. Body scales ctenoid; jaws without canines Oxyeleotris. 



ee. Preoperculum with a spine at the angle Eleotris. 



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



g. Top of head with bony crests Butis. 



gg. Top of head without bony crests. 



h. Preoperculum with 2-3 strong spines Asterropteyix. 



hh Preoperculum unarmed. 



i. Cheeks and opercles naked Phi lypnodon. 



ii. Opercles scaly, cheeks more or less scaly. 



j. Interorbital space scaly. 



Ic. Snout broad, flat and depressed ; scales on upper surface of head enlarged ; 

 first dorsal usually with 6 spines Ophiocara. 



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

 first dorsal with 7-9 spines Mogurnda. 



jj. Interorbital space naked. 



I. Scales smaller, 37-40 ; body moderately elongate Gohiomorphus. 



U. Scales larger, 27-35 ; body deeper Cavassiops. 



Genus Ptereleotris, Gill. 



Ptereleotris, Gill, Proc. Acad. Nat. Sci. Philad., 1863, p. 270 (Eleotris 

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



Body elongate, compressed, covered with minute cycloid scales, -wliicli 

 are separate anterioi-ly ; no lateral line. Head naked, short. . Eye of 

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

 chin without barbies. Teeth in several rows in each jaw, with large 

 canines; palate toothless. Tongue stj'liform. Gill-openings wide, isthmus 

 narrow, shoulder-girdle smooth. Pseudobranchiae present ; gill-rakers 

 long, slender, and numerous. Six dorsal spines and about 29 rays ; anal 

 opposite the dorsal, with about 27 rays. Ventrals i/4. Some of tlie 

 caudal rays produced. Vertebroe about 2G. 



Ptereleotris mickoleims, Bleelcer. 

 (Plate XXX vii., fig. 1.) 



Eleotris microlepis, Bleeker, Nat. Tijdschr. Ned. Indie, xi., 1856, p. 102. 



Id., Giinther, Cat. Fish. Brit. Mus., iii., 1861, p. 132. Id., Giinther 



& Playfair, Fish. Zanzibar, 1866, p. 75, pi. ix., tig. 5. 

 Eleotriodes microleins, Bleekei% Nat. Tijdschr. Ned. Indie, xvi., 1858, p. 212. 

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



p. 103. 

 Eleotris elongata, Alleyne 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. Four 

 bi-anchiostegals. Vertebrce 26, including the liypural. 



Depth 78 in the Umgth to the hypnral ; head 52 in tlie same. Fye 

 sliglitly longer tluui <lie snout, 37 in tlic liead. Bony interorbital width 

 1-3 in the eye. Snout 42, depth of caudal-pcdiiiich' 2 in tlie bead. 



