GYGE HIPPOLYTES. 231 



apparently inarticulate mass of an elongate ovate form, 

 somewhat truncated at the base, scarcely with indications 

 of divisions between the joints, the extremity being entire. 



The female is broadly ovate, with the body slightly 

 curved towards the left, the segments distinct, especially 

 those of the tail, which is terminated by a small joint 

 notched at its extremity, two minute pleopoda of an elon- 

 gate-ovate form arising on its underside and having their 

 ends visible within the emargination of the joint. 



The head is broad, furnished on .its underside with two 

 pairs of minute conical antennae, the inner pair consisting 

 of three, and the outer pair of four joints, the penulti- 

 mate of which is slightly setose, and the last terminated 

 by a minute fascicle of setae ; the seven pairs of feet are 

 small but robust, and of uniform size and shape, termi- 

 nated by an elongate-ovate hand with a minute but 

 strongly hooked finger ; the two preceding joints being 

 rather rugose at their extremities on the underside. 



This species was first described by Kroyer, who de- 

 tected it as a parasite on a species of prawn of the 

 genus Hippolyte (II. polaris). 



A specimen of this species is recorded as having been 

 taken by the late Mr. W. Thompson, of Belfast, on the 

 coast of Galway. The specimen belongs to the Belfast 

 Museum, and is, unfortunately in a damaged condition. 



Another specimen (of the female), which appears to 

 us to belong to the same species, and which has supplied 

 the central figure in the above woodcut, was forwarded to 

 us from Polperro by Mr. Loughrin ; our two lower-side 

 figures being copied from Kroner's figures of the male 

 and underside of the female. 



