404 GAMMA RIDiE. 



furnished with several fasciculi of short hairs, curved 

 and anteriorly directed. The hand is continuous with 

 the wrist, but scarcely so broad ; it is three times as long 

 as broad, with the upper and lower margins parallel, and 

 has no defined palm ; but the finger, which is curved 

 almost at right angles near the base, reaches, in the 

 typical specimens, to the anterior extremity of the pro- 

 jecting point of the wrist. In some which Professor 

 Kinahan has sent to us from Dublin, we have found the 

 finger to be not quite so long. This appears to be also 

 the case in the specimen described as Gammarus lavis by 

 Bruzelius from Svt^eden. The three posterior pairs of 

 legs have the thighs very oval with the posterior margins 

 serrated. The posterior pair of caudal appendages are 

 long ; the branches are subfoliaceous, equal in length, 

 and remarkably free from hairs — a peculiarity that 

 appears to be characteristic of these appendages through- 

 out the genus. The telson is double, long, and naked. 



This species was long since taken by Dr. Leach on the 

 south coast of England, and remained undescribed in the 

 collection of the British Museum. Mr. Thompson next 

 recorded it from Belfast. We have since received it 

 from Dublin Bay, where it was taken by Professor 

 Kinahan. The Rev. George Gordon has sent us 

 specimens from the Moray Frith, in which the finger of 

 the second pair of hands resembled the Irish form, as did 

 also some sent to us by Mr. Webster from St. Michael's 

 Mount on the coast of Cornwall. Professor Bruzelius 

 records the same form under the name of G. Icevis among 

 his Skandinavian Gammari, but it does not appear to be- 

 numerous anywhere. 



