194 GAMMARlDjE. 



the hands gradually increase in their diameter towards 

 the palm, which occupies the anterior margin : it is con- 

 vex, but its limit is not defined, but gradually rounded 

 into the inferior margin, and slightly fringed with 

 hairs. The third and fourth pairs of legs are also uni- 

 form, and furnished along the posterior margins of the 

 wrists and hands with strong stiff spines, which appear 

 to have the capability of being brought into contact with 

 each other, and so of obtaining a prehensile power. The 

 next pair of legs have the thigh gradually dilated, and 

 the posterior margin of the succeeding joints furnished 

 with long plumose hairs, and the anterior margin 

 with fasciculi of spines : they terminate in a knife- 

 shaped finger, the anterior margin of which is entire. 

 The last two pairs of legs are uniform ; they are fur- 

 nished with a few short hairs and spines, and terminate 

 in a straight finger. The antepenultimate pair of caudal 

 appendages have the branches very unequal, whilst those 

 of the penultimate are equal, as are also those of the 

 ultimate, which are much longer, and have the inner 

 branch covered with plumose hairs, whilst the outer one 

 is clean, and tipped with a short spine at the extremity. 

 The terminal plate or tail-piece is double, each division 

 being tipped with a small central spine, flanked on each 

 side with a minute hair. 



We received this species from our kind correspondent, 

 Mr. Gregor, of Macduif, who took it in the Moray 

 Frith. It is named in compliment to the indefatigable 

 author of the " History of the British Entomostraca." 



