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The Osteology of Cromeria nilotica and Galaxias 
attenuatus. 
By 
H. H. Swinnerton, D. Sc. 
University College Nottingham. 
With 15 figures in text. 
In the autumn of last year Mr. BOULENGER!) published prelimi- 
nary descriptions of fishes collected by Mr. Laur from ¢he Nile. 
Among the rest was one to which he gave the generic name Cromeria 
and which he placed provisionally in the family Galaxudae. He 
‚defined the new genus thus: “Body elongate, cobitiform, compressed, 
naked. Mouth small and inferior, toothless; gill-openings narrow, 
lateral. Ventrals midway between head and caudal; dorsal and anal 
short, the former opposite to the space between the latter and the 
ventrals. Air-bladder slender, elongate, extending along the whole 
precaudal part of the body. Vertebrae 30 +15.” He further says 
that it “appears to be most nearly related to Galaxias, with which 
it agrees in the general structure of the vertebral column, the position 
of the fins, the absence of the mesocoracoid bone, and the naked skin. 
It differs widely in the small edentulous mouth and the narrow gill- 
openings”. 
Perceiving that this little fish, which was only about 30 mm long, 
was likely to prove interesting Mr. BOULENGER expressed a desire to 
have its skeleton examined by microscopic sections, and its more 
complicated parts reconstructed. This I undertook to do, and also to 
examine and compare Galaxias. 
My thanks are due to Prof. G. B. Howes and Mr. BOULENGER 
for much help and for many friendly suggestions. 
1) in: Ann. Mag. nat. Hist., (7) V. 8, 1901, p. 444—446. 
