404 
GAMMA RID-®. 
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 Icevis by 
Bruzelius from Sweden. 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. 
