GAMMARnxaE. 



infero-posterior angle of the second and third segments 

 of the tail produced to a point. The superior antennae 

 are about two-thirds the length of the animal, exclusive 

 of the long caudal appendage ; being rather longer than 

 represented in the figure illustrative of this description. 

 The inferior antennae are about half the length of the 

 superior, but the flagellum is as long as the peduncle. 

 The hands of the second pair of legs are scarcely 

 appreciably larger than those of the first. They 

 approach in form an imperfect oblong square, the nar- 

 rowest diameter is nearest the wrist, the broadest at the 

 palm ; the inferior margin is longer than the superior, 

 and furnished with four fasciculi of hairs, each standing 

 upon its own protuberance, and increasing in length as 

 they approach the palm ; the palm is produced an- 

 teriorly as it approaches the inferior angle, with which 

 it obtusely forms an angle somewhat less than a right 

 angle, a short distance within which stands a long stout 

 double-pointed spine, against which laterally the finger 

 impinges when closed. The fingers of the last three pairs 

 of walking legs are distinctly unguiculate, the point at 

 which the nail originates being defined by a sharp tooth. 

 There appears little else that can distinguish this from 

 the preceding species, with which it was found associated 

 in an old pump at Ringwood, as well as unmixed with 

 any other species in a well but recently dug at Upper 

 Clatford, near Andover, Hants, by the Rev. Mr. Hogan, 

 who has kindly presented specimens to us as well as 

 to the Hope Museum at Oxford. We have also 

 been favoured with specimens caught in water from a 

 pump at Warminster, Wilts, by Miss Margaret E. 

 Slent ; and since this has been in the press Professor 

 Kinahan has sent us specimens taken in great abundance 

 in an old well sunk in limestone in Dublin, in which a 



