406 GAMMA RULE. 



peduncle, and varies from nine to fifteen articuli. This 

 great variation in the number of articuli to the flagellum 

 is dependent upon age, sex, and accident, and demon- 

 strates the little value, in a specific point of view, which 

 ought to be placed upon the length of this portion of the 

 antennae. The flagellum will sometimes double the 

 number of its articuli in a single moult. 



The coxae of the three (or four) anterior pairs of legs 

 have the inferior margin serrated. The hands of the first 

 two pairs are long-ovate, slightly tapering, and having 

 the palm not defined ; the second pair being rather 

 larger than the first. The last three pairs of legs have 

 the thighs oval, and the posterior margin serrated. The 

 last pair of caudal appendages are long, and have the 

 branches subfoliaceous, and equal in length. The 

 colour of the animal is whitish, faintly marked with 

 blotches of rose-colour. The skin, as seen through a 

 low power of the microscope, is rough ; this is occasioned 

 by its being covered by a series of minute points, which 

 appear to stand obliquely from the surface, as shown in 

 our cut. 



We have dredged this animal in Plymouth Sound, and 

 found it among the refuse brought in by the trawlers. 

 Mr. Loughrin has sent it to us also from Polperro. 



