240 DUBLIN UNIVERSITY 



The posterior pair of pleopoda wert missing in the only specimen 

 that has yet been found ; a solitary hair surmounts the four posterior 

 segments of the pleon. In other respects the animal appears not to 

 differ much from the other species of the genus. 



Length about i&ths of an inch. 



Its habitat is a pump in a house at Ringwood (Rev. A. R. Hogan). 

 The species is named after Koch, who first described and figured these 

 subterranean Amphipoda. 



Crangonyx (n. g.). 

 Like Gammarus, but, not having fasciculi of spines upon the poste- 

 rior segments of the pleon, and having the posterior pair of pleopoda 

 unibranched. Telson single. 



Crangonyx subterraneus (w. 5.). (Figs. 3 $* 4.) 



Male. — Eyes not visible. Superior antennae not longer than the 

 inferior. First pair ofgnathopoda a little stouter than the second; 

 propodos quadriform ; palm slightly convex and a little oblique ; infe- 

 rior margin slightly incurved. Second pair of gnathopoda a little 

 longer than the first ; slight ; propodos long, ovate ; palm very oblique, 

 and continuous with the inferior margin. Three posterior pairs of pe- 

 reiopoda, having the bases serrated, and fringed with short ciliae. Pos- 

 terior pleopoda scarcely longer than the two preceding, furnished with 

 hairs stout and spinous. 



Fig 5 



Fig 4 



Length about 4- 20ths of an inch. 



Found associated with Mphargi in a well at Ringwood by the Rev. 

 A. R. Hogan. 



It is not improbable that this may be the Gammarus subterraneus of 

 Leach ; but we have no means of ascertaining. 



The name of the genus is derived from Kpav^ov and vv%. 



