GAMMARIDEA. 869 



antennae about half as long as base of inferior, and flagellum five- 

 jointed. First pair of feet having a small hand, slightly oblong, 

 somewhat securiform, at apex somewhat broader and obliquely 

 truncate, the carpus below near hand gibbous. Hand of second 

 pair large subovate; palm straight, nearly longitudinal; finger 

 longer than half the hand. Next four feet subequal, the rest 

 gradually increasing in length, rather short; setae of fifth joint 

 much shorter than the semidiameter of the joint ; first joint broad, 

 margin minutely serrulate. Outer branch of first pair of stylets 

 naked. 



Plate 58, fig. 5 a, animal, enlarged ; b, part of flagellum of inferior 

 antennae ; c, superior antenna ; d, extremity of leg of first pair ; e, 

 ibid, of third ; /, ibid, of sixth pair. 



From among floating Fucus, near the shores of Tierra del Fuego. 

 Caught with a hand-net. 



Length, one-third of an inch. Colour, green. Body compressed, 

 shining. The head in profile is short vertically, but the organs of the 

 mouth are not concealed. Eye round. The epimerals are broad and 

 subrotund ; the fifth a little smaller than fourth. The last segment 

 of the abdomen is triangular, with the apex slightly recurved. The 

 superior antennae extend to apex of penult joint of base of inferior 

 antennae; the flagellum is five-jointed. The flagellum of inferior 

 antennae fourteen to fifteen-jointed and flattened, and in the speci- 

 mens preserved in alcohol the margins are reddish; the base is short; 

 the last two joints subequal. The claw of the hand of first pair of 

 legs shuts against the apical margin, and is as long as this margin. 

 The penult joint has a protuberance on the under side. The hand of 

 the second pair has an emargination towards base on the inferior 

 side, where the finger when closed terminates, and below the emar- 

 gination, at the apex, there is a very minute spine. Breadth of 

 hand, about half the length. The fifth joint of the sixth or seventh 

 pair of legs has about five sets of setae on the under side, none over 

 one-third as long as the diameter of the joint, and four sets on the 

 upper side, which are still shorter. 



This species resembles the Orchestia eucho?*us of Fr. Muller (Archiv 



218 



V 



