198 XOTIiS ox CEPHALEUTHEJiUS—GILL. vol. xvm. 



IV. 



The Frophygia of Gray. — Gray, in 1851, cited the name Prajyleygia, 

 Otto, in the syuouy my of the geuus Raja^ but without reference to pUice 

 of publication or date. Propleygia is, of course, merely a slip for Prop- 

 terygUi. The statement is made that the nominal genus "is founded 

 on a monstrosity rather frequent among the Eays.'' 



The various names tliat have been given to the monstrosity, or stages 

 of arrest of development, of the pectoral fins maybe combined here: 



CKPHALEUTHERUS PHASE. 



CvpJialt It thtr )(■•<, liAiiNKStiUE, ludice Ittiol. Sicil., p. 61, 1810. 



Hieroptera, Flemixc, Ediubnrgh New Phil. Journ., XXXI, p. 2M, ]>ls. 4, n, 1841. 



I'ROPTEKVGIA I'HASK. 



I'lopterijgia, Otto, Nova Acta Acad. Caes. Leop. Car. Nat. Cur., X, p. Ill, x)]8. 5, (3, 



1820; CoDspectus Animal., 1821 (fide Fleming). 

 I'rophiiijia. Otto, ./?f/<; Cray, List Fish. Brit. Mus.. I, p. 10.5, 1851 ('misprint?). 



VI. 



The Ictaetus of Rafincsque. — Although CcphaJeutlieruSj as has been 

 shown, was not identical with Myliohatis, one of Eafinesque's genera 

 was, in all probability. In his "Analyse de la ^N'ature''' the name 

 Ictaetus, Raf., occurs between Mobula, Raf., and Cephaleutherus, Eaf., 

 and this is doubtless merely a Greek e(piivalent of " Eagle-ray," a 

 quasi-popular designation of Myliohatis. Ictaetus is, however, a pure 

 nomen nudum, and can not therefore be revived. 



= 1815, page 93. 



