CYAMUS OVALIS. 9o 



According, also, to M. Roussel de Vauzeme, Cyamus 

 ovalis, as well as C. gracilis, are only found upon the tu- 

 bercles of the chin, lips, and upper jaw of the whale, and 

 especially upon the larger tubercle of the head, which 

 the whale-fishers call the crown, near the blow-holes, and 

 the horny excrescences with which it is surrounded. 

 Sometimes, indeed, C. ovalis is found in such vast num- 

 bers in this last situation, that at a considerable distance 

 the patch of white colour, produced by their presence, 

 may be observed when the whale comes to the surface to 

 breathe. In this situation the individuals of C. ovalis 

 arrange themselves with considerable regularity, by 

 which they are distinguished from C. gracilis, which are 

 scattered about more irregularly. 



The young of C. ovalis, as figured by M. Guerin 

 Meneville, in the " Iconographie du Regne Animal," is 

 more regularly elongate-ovate than the young of C. ceti, as 

 figured above by ourselves, with the legs almost cylin- 

 drical, the fourth joint but moderately dilated ; indeed, 

 according to M. Milne Edwards (Ann. Sci. Nat. vol. iii. 

 p. 329), *' Les jeuues Cyamus ont une forme suelte et 

 elancee," all the segments being perfectly alike, re- 

 sembling portions of a cylinder with the legs " greles, 

 cylindriques, et parfaitement extensibles ;" and with the 

 branchial vesicles not more developed than in Prafo, 

 Caprella, &c. 



