THOMPSON'S HIPPOLYTE. 291 



length ; the hand thicker than the wrist, which is rather 

 short, and has but few articulations. The abdomen is 

 remarkably gibbous, and the anterior segments are very 

 slightly scabrous at the sides. 



Length nearly an inch. 



Of this new species of H'ippolyte I have seen but one 

 specimen, a female loaded with extruded ova, which I 

 received from my friend Mr. W. Thompson of Belfast, the 

 acute and successful investigator of the zoological treasures 

 of his own country, by whose labours our knowledge of 

 the natural history of that part of the United Kingdom 

 has been so much enriched, and to whose name I dedicate 

 the species. It was obtained by that gentleman, with 

 specimens of ff. Cmnchii, on the north-west coast of 

 Ireland. 



It differs from If. pandaliformis in the form of the ros- 

 trum, which is shorter, and toothed throughout its whole 

 length, as well as in its general figure, which in the present 

 species has more of the normal aspect of the genus, and 

 less resemblance to the more typical Palamonida. From 

 H. Cranchii it differs in the longer, straighter, and more 

 toothed rostrum, and in the less gibbous form of the thorax 

 and of the abdomen. With no other species could it be 

 confounded, even at the first glance. 



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