34 Mr. A. 0. Walker on Amphipoda 



Third pleon-segment with the hind epimeral margin 

 convex; posterior angle produced in a small tooth, above 

 which is a minute denticle. 



Eyes irregularly oval, oblique, large, and dark. 

 Antenna 1 rather longer tiian 2, about iialf as long as the 

 body; appendage 1-jointed, shorter than the first joint of the 

 flagellum. 



Antenna 2 : peduncle rather longer than that of antenna 1 ; 

 second joint shorter than third. 



Maxilla 1: inner plate with 7 sette, diminishing in length 

 downwards. 



First gnathopods : side-plates wide-oblong, with rounded 

 angles, not distally widened, the front margin slightly 

 concave ; second joint subequal to the hand, strong ; wrist 

 subequal to the hand in length and width, triangular, not 

 cup-shaped, very setose behind ; hand oval, palm undefined, 

 with setiferous ridges on both margins. Dactylus about one- 

 third as long as the hind margin. 



In the young specimen the wrist is only one-third as long 

 and half as wide as the hand, not much produced behind ; 

 the hand is wide-oval, the palm distinctly defined by an 

 obtuse angle and a group of strong spines and as long as the 

 hind margin. Dactylus slender, as long as the palm. 

 The second gnathopods are like the first, but larger. 

 Perseopods 3-5 with second joint wide-oval, faintly serrate 

 behind. 



Telson about as long as the sixth pleon-segment, rather 

 longer than the width at the base, cleft fully two-thirds of 

 its length, ends of divisions rounded, slightly dehiscent ; an 

 upright spine near the middle of the outer margin and 

 another near the end. 

 Length 10 mm. 



Distinguished by the form of the gnathopods and telson. 

 The diflference between the former in old and young is 

 remarkable ; the specimens agree in other respects, and 

 appear to have been taken together, but unfortunately the 

 whole pleon is wanting in the small specimen. 



ParamcBra austrina (Bate), var. 



Terror Cove, Port Ross, 16/3/04. One female, with ova ; 

 length 7'5 mm. 



Differs from the forms described in the ' Challenger ' 

 Report under the names of Ati/luides australis (Miers) and 

 A. assimilis, Stebbing, in the third pleon-segment, which 

 has the hind epimeral margin forming a semicircle with the 



