292 
GAMMARIDiE. 
hairs ; the palm is defined by a strong spine and a few 
hairs ; the inner margin of the finger is serrated near the 
middle. In other respects this species resembles M. 
gryllotalpa both in form and colour, being of a grey 
which assumes a very dark tint along the dorsal surface, 
particularly towards the anterior extremity of the animal. 
This darker portion is produced by numerous small pig- 
ment cells, which spread themselves, more or less thickly, 
just beneath the dermal tissue. We have observed in 
this species (though we think it also belongs to others of 
the genus), that when the animals are dried the surface 
of their bodies exhibits prismatic hues. 
We have received it from Falmouth, where it was 
dredged by Mr. Webster, to whom we are indebted for 
the results of his dredgings in several localities, and in 
compliment to whom the species is named. Mr. Barlee 
has also sent it us both from the Island of Skye, as well 
as from the Shetlands ; and in the latter place the 
Rev. A. M. Norman, in company with Mr. Jeffreys, has 
dredged it in four fathoms of water in Bressy Sound. 
