80 CYAMIDE. 
AMPHIPODA. CYAMIDA. 
ABERRANTIA. 
Genus—CYAMUS. 
Cyamus. Lamarck, Syst. d. Anim. sans Vert. p. 166. LarvrerLie, Hist. 
Nat. Crust., &c., vi. p. 328.  Dxsmarzst, Cons. Crust. 
, on 
Larunda. mis Oe Linn. Soc. xi. p. 363. SAMOUVELLE, Ent. Comp. 
p. 106. 
Panope. eacu, Edin. Encye. vil. p. 404. 
Generic character. UHead and first segment of the body 
fused into a pear-shaped mass. yes 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. 
_Tuese 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 aflix 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. 
