DEFORMITIES IN SALMONIDAE. 299 



NOTE XXII. 



ON DEFORMITIES OF THE HEAD IN SALMONIDAE. 



BY 



Dr. Th. W. van LIDTH de JEUDE. 



(Plate 7). 



In the » Verhandlungen der k. k. zoologisch-botanisclien 

 Gesellschaft in Wien" (Jahrg. 1863) Dr. Steindachner des- 

 cribes 3 monstrous heads of carps , presented to the Museum 

 of Vienna , and suggests that these monstrosities could 

 not be the results of some former wound , but that the 

 deformity was caused by the pathological state of some part 

 of the skull. 



[n Isid. GeoflProy St. Hilaire's interesting researches on 

 teratology ^) we see on plate 1 (fig. 4 , 5 and 6) three draw- 

 ings of carp-heads , that bear a great resemblance to 

 the figures of Dr. Steindachner's. According to the author 

 these anomalies are not very rare in France, at those 

 places where carps are cultivated in ponds ; and Otto ^) also 

 states the appearance of such monstrosities in Silesia. 



In other fishes these deformities seem to be much rarer. 



In Vrolik's Atlas ') a pike is figured having the face 

 and the upper-jaw but slightly developed, and consequently 

 the under-jaw very prominent. 



A similar drawing is to be found in Otto's Atlas of 



1) Is. Geoffrey St. Hilaire , Histoire générale et particuliere des anomalies de 

 l'organisation chez Thomme et les animaux. Paris, 1832. 



2) Otto, Lehrbuch der pathologisclien Anatomie. 



3) Tabulae ad illustrandum embryogenesin bominis et mammalium tam natu- 

 ralem quam abnormam, auctore W. Vrolik. Amstelodami, 1849. Tab. 61 , tig. 6. 



Notes from the Leyden IVluseum, "Vol. "VII. 



