LYSIANASSA COST^. 77 



shorter than their peduncles, and are naked, being un- 

 furnished with either spines or hairs. The middle tail- 

 scale is round at the apex, squamiform, superiorly con- 

 cave, and furnished subapically on each margin with one 

 solitary cilium. The structure of the skin, as viewed 

 beneath the microscope, shows but a number of minute 

 granules scattered thickly over the texture, while minute 

 cilia are seen to spring upright from its surface. 



The animal is sometimes very transparent, verging to 

 a gray along the dorsal surface, where each segment is 

 marked with a white patch. The anterior portion of the 

 body is tinted with yellowish brown, and one or more 

 spots of the same colour exist upon each segment, and 

 on some of the coxas. 



We have received specimens from Tenby, where it 

 was dredged by our friend Mr. Webster, to whom we 

 are indebted for Crustacea from many different localities. 

 Mr. Alder has taken a single specimen on the coast of 

 Northumberland. We have also taken it at Plymouth, 

 and found it amongst Mr. Thompson's Collection of 

 Amphipoda, marked as having been taken at Belfast by 

 Mr. Hyndman. 



The original specimen named by Prof. Milne-Edwards 

 is still preserved in the Collection of the Jardin des 

 Plantes at Paris, and through his courtesy and kindness 

 we have been able to examine and compare it with the 

 British form. The type was taken at Naples. The 

 specimen in the British Museum, presented by the 

 Marquis Spinola, under the name of Gammarus glaber, 

 unquestionably belongs to this species. Specimens also 

 which answer to the description of this species have 

 been taken at Sukkertopper, near Greenland, in forty 

 fathoms by Mr. Holboll. The form appears to be 

 peated in several parts of the world ; for the species 







