652 PATAGONIAN EXPEDITIONS : ZOOLOGY. 



dite; palmar margin oblique, nearly straight, with several rows of setae, which 

 become spine-like at the outer end ; just below this end there is a group of 

 more numerous setas. There is no excavation to receive the tip of the 

 dactylus. Outer surface of palm with an oblique row of setae. Dacty- 

 lopodite slender, slightly curved. 



First gnathopod of 9 (fig- 3, c) similar to that of the J, but propodite less 

 distinctly triangular, and accordingly, less wide in proportion to length. 



Second gnathopod of J" (fig. 3, a'): meropodite with a triangular, pointed 

 prominence on the lower margin. Carpopodite about as long as mero- 

 podite, with a narrow, pointed prolongation of the lower margin, which 

 is longer than the width of the rest of the carpopodite. Palm (measured 

 along the upper border) about 4 times as long as carpopodite, triangular, 

 swollen, in general form very similar to that of //. dentata iiiennis. 

 Palmar margin oblique, very slightly sinuous, with a series of small spines ; 

 the lower (outer) end with a depression to receive the tip of the dactylo- 

 podite, and around this depression with 2-3 stronger spines. Dactylo- 

 podite slender and curved. 



Second gnathopod of 9 (fig. 3, e) similar to the first gnathopods of 

 ^ and 9, but meropodite with the prominence of the under margin more 

 pronounced (but not triangular and pointed, as in the second gnathopod 

 of the J*) ; process of lower margin of carpopodite a little longer than 

 that of the first gnathopod, and palm still more elongated, distinctly 

 longer than the carpopodite, and less triangular than that of the first 

 gnathopod of the 9. (This is very dissimilar to that of H. dentata 

 inerniis. ) 



Peraeopods : First (fig. 3,/"), second and third of about the same length, 

 fourth longer than third, fifth (fig. 3, g) about as long as fourth. The 

 last (fifth) extends backward a little beyond the tip of the first uropod. 

 Basipodite of third to fifth enlarged, oval, that of fifth pair larger than 

 those of the third and fourth. Hind edge of third, fourth and fifth ser- 

 rated, most distinctly so in the fifth. Accessory branchiae on the first to 

 the fifth peraeopods. No ordinary branchiae on fifth. 



Uropods (fig. 3, //) : First and second with spines on both rami. Third 

 uropods: ramus about as long as the peduncle, only slightly extending 

 beyond telson. 



Telson (fig. 3, h), almost semicircular, or, more correctly, half-elliptic, 

 with a pair of fine setae on the rounded hind margin. 



