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GAMMARIDJ2. 



age. The inferior antennae are situated very far pos- 

 teriorly to the superior. The mandibles possess a three - 

 jointed appendage. The arms are slender, feeble, and 

 imperfectly subchelate. The third and fourth pairs of 

 legs are uniform, and have the fourth joints long and 

 broad, the wrists short, and the fingers very long and 

 styliform. The fifth and sixth are also uniform ; they 

 have the fingers short, and directed posteriorly. The 

 seventh differ from the others, and have the foot broad 

 and the finger straight. The posterior pair of caudal 

 appendages are subfoliaceous ; the branches are sub- 

 equal. The caudal plate is squamiform, and cleft down 

 the centre. 



The following vignette, for which we are indebted to 

 our friend Dr. Scott, of Selby, Shetland, is a view of the 

 Doreholms, Shetland, as seen by the Aurora Borealis. 



