102 GAMMARID.E. 



antennae are scarcely longer than the head ; the first joint 

 of the peduncle is long, nearly as broad at the distal ex- 

 tremity as at the centre, and superiorly it considerably 

 overlaps the second joint ; the second joint is short, but 

 not much narrower than the first, it also considerably 

 overlaps the third ; the third joint is very short, but longer 

 on the internal upper margin than at the lower: the 

 first articulus of the flagellum is as long as the peduncle, 

 and is furnished upon the inner surface with two longi- 

 tudinal series of rows of minute hairs ; the rest of the 

 articuli, about thirteen in number, are as broad as long, 

 and inferiorly furnished upon the inner surface of each 

 with three hairs. The secondary appendage is short, not 

 being longer than the first articulus of the flagellum ; it 

 consists of three articuli, the first long, the other two 

 short. The inferior antennae are rather more than half 

 the length of the animal ; the last joint of the peduncle 

 extends quite to the distal extremity of the first articulus 

 of the flagellum of the superior antennse ; the flagellum 

 is long and slender, and reaches to half the length of the 

 animal. The epistoma is not very prominent. The 

 mandibles have both extremities of the incisive edge 

 produced beyond the intermediate blade ; the molar 

 tubercle is furnished with a few short obtuse spines. 

 The appendage is long, with the second joint longer 

 than the third. The first pair of legs are long and 

 slender ; they have the wrist and hand subequal in 

 length, the wrist being rather broader than the hand ; 

 it has the margins parallel, and terminates abruptly ; the 

 hand has the margins parallel, the palm is oblique, con- 

 vex, being formed by the apical margin gradually round- 

 ing into the inferior ; it is minutely pectinated through 

 its entire surface, and is defined only by the cessation of 

 the small teeth ; the finger is long, slender, and slightly 



