656 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



are two thirds of the length of the body. Number of joints about the 

 same as in our species (antennae of <?, 18 joints). 



2. Shape of first gnathopod different, the carpopodite large, distinctly 

 longer (i# times as long as propodite). 



3. In the second gnathopods of the <?, carpopodite about one third of 

 the propodite (expression ambiguous: " dreimal kuerzer"), and propo- 

 dite apparently shorter than in our species. For the rest, the propodite 

 seems to possess a similar shape, although the spinules of the palmar 

 margin seem to be different. 



4. The propodite of the second gnathopod of the 9 seems to be quite 

 different, being 2.y z times as long as broad. 



5. No accessory branchiae on the fifth peraeopods. 



6. Size smaller (5 mm.). 



Thus it seems that this species is much more different from H. pata- 

 gonica than H. inermis, especially in the shape of the antennulae, antennae 

 and gnathopods. 



H. hibomirskii (Wrz.) from Peru differs from our species : 



1. Head shorter, and eyes oval (not round). 



2. Antennulae and antennae longer (antennae of $ over one half of the 

 body). Number of joints slightly greater. 



3. Second gnathopods of <$ apparently similar to our species, but palmar 

 margin cut into two lobes, and meropodite \y z times as long as carpo- 

 podite. In the 9, the propodite is longer than in our species, almost 

 twice as long as wide. 



4. Size smaller (6 mm.). 



Here the first gnathopods are apparently more like //. patagonica (car- 

 popodite hardly longer than propodite). This species resembles more 

 H. inermis in the first and second gnathopods, but head, eyes, antennulae 

 and antennae are different. 



H. dyboivskii (Wrz.) from Peru differs from our species : 



1. Eyes oval, dilated below. 



2. Antennae longer (half as long as body). Number of joints of 

 antennulae and antennae near that of our species (antnl. 10-13, ant - 



H-I5). 



3. Carpopodite and meropodite of second gnathopod about one third 



as long as propodite. 1 For the rest the first and second gnathopods seem 



l "Zweimal kuerzer." This expression is very ambiguous, in a double sense. 



