124 TANAIS. 
last four species are described in detail in the second 
series of the same work (vol. ii. p. 408). 
In a paper on the structure and relations of the genus 
by Fritz Miller (Archiv. f. Naturg. 1864, p. 1—) the 
author is, however, induced to consider that T. Edwardsu 
and Savignyi are the sexes of the same species, and 
that 7. curculio and Orstedii are in the same condition. 
From the various localities in which the different 
species have been found, we presume that they were 
taken at large by dredging, and consequently are not 
parasitic in their habits. Van Beneden, however (who 
has published some observations on the genus in the 
fifth volume of the second series of the “ Bulletin of the 
Académie Royale de Belgique,” as also in his ‘ Re- 
cherches sur la faune littorale de Belgique,” Crust. p. 93, 
pl. 164, where he has given a rude figure and details of 
T. Dulongi), states that he obtained a male and five 
females of that species from the carapace of a Chelonia 
mydas, thrown upon the shore near Ostend, which would 
indicate a carnivorous condition of life for that species. 
Ina memoir on the relation which this genus holds 
to the order of Isopoda,* Prof. Lilljeborg unites in 
this genus not only Crossurus of Rathke, but also Para- 
tanais and Leptochelia of Dana. By so doing he finds 
himself compelled to commence by separating that 
division of the genus which carry two branches to the 
posterior pair of pleopoda from those that carry but 
one. We think that it is more convenient, in our present 
state of knowledge, to keep apart as much as possible 
animals possessing a marked structural distinction. We 
therefore retain in this work Dana’s genus of Para- 
TANAIS. 
Bidrag till Kinnedomen om de inom Sverige och Norrige fore Kom- 
mande crustaceer af Isopodernas underordning och Tanaidernas familj. 
Af Wilhelm Lilljeborg. Upsala 1864. 
otal side 
