1905.] ON THE FISHES OP THE FAMILY GALAXIID^. 363 



d . 527, 528, 537, 538, 539. $ . 526, 529, 531, 532, 533, 534, 

 540. Central Tanegashima. 300' 



(S . 542. 5. 543,544. Nishinoomote, Tanegashima. 150'. 



3. MiCROMYS GEISHA TllOS. 



c?. 536. $.535,539,541. Central Tanegashima. 300'. 

 These specimens are intermediate, as should be the case, 

 between the long-footed yahui and the ordinary geisha of Japan. 

 Three of the specimens are measured as having the hind foot 

 19"5 mm. 



EXPLANATION OP PLATE IX. 

 Mustela melampus hedfordi, p. 343. 



■4. A Revision of the Fishes of the Family Galaxlidw. 

 By (J. Tate Regan, B.A., F.Z.S. 



[Received October 26, 1905.] 

 (Plates X.-XIII.*) 



The Galaxiida3 are a family of Teleostean Fishes which ai-e placed 

 by Boulenger in the Haplomi, a suboi-der defined by the abdominal 

 ventral fins, the persistent pneumatic duct, and the absence of a 

 mesocoracoid element in the pectoral arch. 



They may be thus defined : — 



Maxillary behind the prasmaxillary and toothless, but to a 

 certain extent bordering the mouth. Parietals in contact, 

 sepai'ating the frontals from the supraoccipital ; orbitosphenoid, 

 basisphenoid, and opisthotic wanting ; pro-otics not forming a 

 roof for the eye-muscle canal, which is confluent with the cranial 

 cavity ; mesethmoid small, unpaired. Ribs attached to auto- 

 genous pai'apophyses ; epipleurals and epineurals present. Post- 

 temporal simple, attached to the epiotic ; pectoral pterygoids 

 normal, 4 in number. 5 to 1 1 branchiostegals ; gill- membranes 

 free from the isthmus ; pseudobranchise present ; foui- gills, a 

 slit behind the fourth. Body naked. No adipose fin. Pectorals 

 placed low ; ventrals, if present, with 6 or 7 rays. Air-bladder 

 present. Ova falling into the abdominal cavity before extrusion. 



The closely allied Haplochitonidse differ in the greater develop- 

 ment of the prtemaxillaries, the presence of a roof for the eye- 

 muscle canal, formed by the pro-otics, and in having an adipose fin. 



The Esocidje of the Northern Hemisphere resemble the 

 Galaxiidee and Haplochitonidte of the Southern in the primitive 

 structure of the vertebral column, also in the shape of the cranium, 

 the orbitosphenoid wanting and the opisthotic very small or absent. 

 However, the pi^esence of well-developed paused ethmoids and the 

 separation of the parietals by the supraoccipital are cranial 

 differences of considerable importance. 



* For explanation of the Plates, see p. 383. 



