610 Mr. C. T. Reo-an 07i the 



O' 



o£ the name Gli/ptosternum, and every reason for retalnin^^ 

 it in tlie generally accepted sense. For the species which 

 differ from the type in having the skin covering the pe^cfcoral 

 and pelvic spines smooth — not striated — the name Glypto- 

 thorax may be used by those who consider them worthy of 

 generic or subgeneric distinction, Blyth's diagnosis being 

 based on his new species GL triUneatuSf which may be 

 regarded as the type of Glyptothorax , 



Mr. Hora has examined a iish from Tenasserim in the 

 collection of the Indian Museum, which may or may not be 

 one of Blyth's original specimens of Exostoma herdmorei. 

 This fish is broken in pieces and not fit for investigation, but 

 Mr. Hora thinks it may be a Glyptothorax. He therefore 

 proposes to make Exostoma a synonym of Glyptothorax. A 

 reference to Blyth's original description will leave no doubt 

 that he had before him examples of a species congeneric with 

 McClelland's Gl. lahiatum. The description of the four 

 separate patches of teeth, the lips united to form a sucker, 

 the small gill-openings, the exceedingly slender dorsal spine, 

 the long low adipose fin, and the smooth flat lower surface 

 leave no doubt that Exostoma herdniorei is an Exostoma in 

 the sense in which I used the name in 1905 (Ann. & Mag. 

 Nat. Hist. (7) XV. p. 182), and nothing like a Glyptothorax. 



LXVITT. — The Fishes of the Family Icosteidse. 

 By C. Tate Regan, M.A., F.R.S. 



(Published by permission of the Trustees of the British Museum.) 



The isolated family Icosteidse comprises the monotypic 

 genera Icosteus and Acrotus, from deep water off the Pacific 

 coast of North America. 



The family may be characterized as follows : — 

 Body ovate, strongly compressed, naked, or with scattered 

 prickles. Mouth terminal, bordered above by the non- 

 protractile prsemaxillaries. Teeth in jaws small, pointed, 

 uniserial ; palate toothless. Gill-membranes separate ; 4 

 gills; pseudobranchise present ; 6 or 7 branchiostegals. No 

 spinous fin-rays ; dorsal and anal long, many-rayed ; caudal 

 peduncle slender and caudal fin fan-shaped ; pectorals well 

 np on sides, with subvertical curved base ; pelvics, when 

 present, 5-rayed, well behind pectorals. Air-bladder large. 



