PHILIPPINE MACROUROID FISHES — GILBERT AND HUBBS. 507 

 39. COELORHYNCHUS COMMUTABILIS Smith and Radcliffe. 



Coelorhynehus commutabilis typical foi*m Smith and Radcxiffe, Proc. 

 U. S. Nat. Mus., vol. 43, 1912, p. 128, text fig. 2 (part). 



Coelorhynehus commutabilis form alpha Smith and Radcxiffe, Proc. U. S. 

 Nat. Mus., vol. 13, 1912, p. 130, text fig. 3. 



Coelorhynehus commutabilis form delta Smith and Radcliffe, Proc. U. S. 

 Nat. Mus., vol. 43, 1912, p. 132, text fig. 6. 



Coelorhynehus commutabilis form eta Smith and Radcliffe, Proc. U. S. 

 Nat. Mus., vol. 43, 1912, p. 132, text fig. 7 (two specimens, exclusive of 

 type). 



After having described C. commutabilis, Radcliffe proceeded to de- 

 fine certain " forms," differing from the typical specimens in the 

 presence or absence of scales on the underside of the head, and in 

 the form and proportions of the snout and orbit. The discovery of 

 certain diagnostic characters, such as those we emphasize in the 

 analytical key to the species, has led us to a different grouping of 

 these variants. In order to indicate the relation between these 

 " forms " of Smith and Radcliffe and the species, as we define them, 

 the following comparative table has been prepared: 



Identification by Smith and Radcliffe. 



Present reference. 



Coelorhynehus commutabilis: 



Typical form 



Form alpha 



Form beta 



Form qa mma 



Form delta 



Form eta 



C. commutabilis. 



C. smithi. 



C. commutabilis. 



C. radcliffei. 



C. radcliifei. 



C. commutabilis. 



C. weberi. 



C. commutabilis. 



The statement that mutation has been demonstrated in tnis case 

 therefore appears to lose its significance. 



List of stations. 



This species, as we recognize it, is now redescribed in some detail. 

 The description is based upon the type-specimen, 129 mm. long to 

 anus, and is supplemented and verified in all points by an examina- 

 tion of each of the other 11 specimens. 



1 See Radcliffe, p. 130. 



