CYRT0PI1IUM DARWIN1I. 483 



males in having the hand of the second pair of legs 

 smaller, and the body less compressed. 



It is our opinion that Lcetmatophilus tuberculatus, of 

 Bruzelius, may be the female of a species of this genus 

 in which the penultimate pair of caudal appendages have 

 been broken off and are undergoing the process of repro- 

 duction. This suggestion is, indeed, founded only upon 

 negative evidence; moreover, we think that we should 

 be doing the author of the " Skandinaviens Amphipocla 

 Gammaridea " injustice, in the present state of our in- 

 formation, if we were to insert his genus Lcetmatophilus as 

 a synonym of Cyrtophium of Dana, although we anticipate 

 that they will ultimately be proved to be the same. 



i i 2 



