AMPHIPODA AND ISOPODA OF THE FIRTH OF CLYDE. 33 



and well adapted for burrowing, which they do 

 with great rapidity, throwing the sand out behind 

 them with much force. They swim generally with 

 their backs downwards, but their movement in 

 the water is heavy, and is not long sustained. 

 Like many of their kind, on coming to the sur- 

 face they incline to go round in circles ; and after 

 a few whirls, or other gyrations, they allow them- 

 selves to drop gently down, tail foremost. They 

 make almost no progress out of the water. They 

 are of a bluish-white colour, sometimes with a 

 tinge of brown along the back, apparently derived 

 from the colour of internal parts. The eyes are 

 of a cream colour, and when immersed in spirits 

 they sometimes become dark, or almost black. 

 Like some others of the sand-dwellers, they come 

 to the surface to die. 



This species has been taken near Falmouth by 

 Dr. Leach ; at Moray Firth by the Rev. G. Gordon ; 

 on the coast of Cumberland by Mr. Albany Hancock ; 

 and in Ox wick Bay by Mr. Moggridge and Dr. J. 

 Gwyn Jeffreys. 



Genus U R o t h o e , Dana. 



UROTHOE NORVEGICA, A. Boeck. 



Urothoe norvegica, A. Boeck, Forhandl. ved. de 

 Skand. Naturf., 8de mode (1860), p. 647. 



Urothoe Bairdii, Spence Bate, Catal. of Amphip. 

 in Brit. Mus. (1862), p. 114, pi. xix., f. 1. 



Habitat. — Moderately common in the sand between 

 tide-mark, Lamlash Bay, Arran ; Fintry Bay and 

 Karnes Bay, Cumbrae — in the latter bay in sand 

 in a little fresh-water stream near low-water. 

 Dredged between the Allans, Cumbrae, 1 to 2 

 fathoms, bottom sand and gravel; and off the 

 same shore above forty were taken in the surface- 

 net after sunset. Among these were two or three 

 nearly double the size of the others, but in no 

 other respect were they found to differ from the 



