20 BIOLOGICAL SURVEY OF 



AMPHIPODA GAMMARIDEA 



STENOTHOIDAE 



Metopa hirsutimana spec. nov. (fig. 10) 



Male : The first and second pairs of antennae are not very 

 different in length. The first pair bears a small accessory 

 flagellnm. The mouth parts resemble those of other species 

 of Metopa very closely. The first gnathopod has the fifth 

 and sixth joints large and rather hairy ; the fifth, quadrangu- 

 lar; the sixth, triangular and distally broad. The second 

 gnathopod is strong. The sixth joint is quadrangular with 

 the palm irregularly serrate and rather oblique. The fourth 

 side plate is longer than deep, with the ventral margin nearly 

 straight. The second joint of the sixth pereiopod is moder- 

 ately expanded. The telson is linguiform and acuminate, 

 without spines or setae. 



Female: The second gnathopod has the hand slightly 

 smaller than in the male, but otherwise very similar. 



Length : 4 to 6 mm. 



Cotypes: B 84. 



Remarks: The present species is one of the larger mem- 

 bers of the genus. Its color is a conspicuous pale pink. The 

 species is found free and also in the branchial chamber of 

 the ascidian Pyura ovifera. 



The specific name refers to the hairiness of the hands of the 

 gnathopods. 



