80 



A MPH1P ODA . C YA MID^E. 



ABERRANTIA. 



Genus CYAMUS. 



Cyamus. LAMARCK, Syst. d. Anim. sans Vert. p. 166. LATREILLE, Hist. 



Nat. Crust., &c., vi. p. 328. DESMAREST, Cons. Crust. 



p. 279. 

 Larunda. LEACH, Trans. Linn. Soc. xi. p. 363. SAMOUELLE, But. Comp. 



p. 106. 

 Panope. LEACH, Edin. Encyc. vii. p. 404. 



Generic character. Head and first segment of the body 

 fused into a pear-shaped mass. Eyes small and vertical. 

 Segments of the pereion with the sides horizontally dilated ; 

 the legs attached to the postero-lateral margins ; five pairs of 

 strongly subcheliform legs, wanting in the third and fourth 

 segments, which are furnished with two pairs of branchial 

 appendages, long and filiform. Pleon rudimental. 



THESE animals affix themselves by means of their 

 strong legs upon the rough portions of the bodies of 

 cetaceous animals upon which they feed ; the different 

 species appear to affect particular portions of the bodies 

 of these animals, some being found massed together 

 upon the head, others are more erratic, or affix themselves 

 to the fins, organs of generation and folds of the flesh. 

 The males are larger than the females, upon which they 

 affix themselves by means of the strong hooks of their 

 feet as do the Gammari. The young remain for a con- 

 siderable time attached to the female parent, nestling in 

 the ovigerous pouch or rambling over her body. Their 

 interior structure, as observed by Treviranus and Roussel 

 de Vauzeme, closely approaches that of the Isopoda, the 

 nervous system consisting of eight bilobed ganglions 

 exclusive of the supra-cesophageal, each segment of the 

 body being provided with a ganglion. 



