292 GAMMARID-E. 



hairs ; the palm is defined by a strong spine and a few 

 hairs ; the inner margin of the fi^nger 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. 



