CYAMUS. 83 
body, whilst out of several hundred Cyami preserved in 
the collections at the Jardin des Plants he was only able 
to detect a single individual of C. erraticus, the mode of 
life of that species not rendering it so apparent to the 
collector as the species which associate together in vast 
numbers on prominent parts of the body. 
From the further observations, both of Martens and 
Roussel de Vauzeme, it would appear that the violent 
storms of the winter season are very destructive to the 
Cyami, many of the parts of the whales generally in- 
fested by them being then free; those which survive 
being feeble and discoloured. He only observed C. er- 
raticus to preserve its rosy tint, but its numbers were also 
diminished. 
The relations of the Cyami with other Edriophthalmous 
Crustacea are very interesting. Placed by Linneus, 
Pallas, and Miller amongst the Oniscz, and arranged by 
Fabricius with the Aselli and Cymothoe, their relationship 
with the order Isopoda was indicated; and M. Roussel de 
Vauzeme, the author of an elaborate memoir on the 
genus in the ‘‘ Annales des Sciences Naturelles” (2° Sér. 
vol. i.), maintained their nearer approach to the Isopods 
than to any other Crustacea. Latreille, at first, placed 
the genus with the Gammari, in the order <Amphipoda, 
but he subsequently united it with Caprella, to form the 
distinct order Lemodipoda; nor can we doubt (notwith- 
* standing the objection of M. Roussel, founded on the 
variations in the mode of insertion of what he terms the 
fore legs) that this is the legitimate position of the 
genus; in fact, Caprella is but a laterally compressed 
Cyamus, and but little imagination is required to con- 
vert the former into an excessively attenuated Cyamus, so 
perfectly similar is the disposition of the segments of the 
body and limbs in both animals. 
