ORTMANN: CRUSTACEA OF SOUTHERN PATAGONIA. 643 



For a comparison with our species this is out of the question, on ac- 

 count of the short flagella of the first legs, and the very short caudal flap. 



2. L. htbbocki (Brauer), from Sicily and Algiers, and L. macrurus Lilj. 

 from Archangel, Russia (see Simon, 1886), have a carina of the scutum 

 that is sharp from its beginning at the second cervical furrow down to the 

 hind margin. These two species are closely allied to L. apus (L.) from 

 Europe (see below), which is in some degree related to our species, but 

 just in the character mentioned here they deviate more considerably from 

 L. hatcheri, than L. apus does. 



3. Of the North American species (see Packard, 1883), L. bilobatus 

 Pack, from Colorado is entirely different in the bilobate caudal flap and the 

 longer abdomen (12 segments exposed in the J 1 , 16 in the $). L. couesi 

 Pack, from Montana and Utah differs in the much shorter abdomen, and 

 the longer and distinctly spatulate caudal flap. L.packardi Simon (1886, 

 p. 448) from California differs at once in the very short abdomen, in the 

 second cervical furrow, which is interrupted in the middle, and in the 

 median keel of the caudal flap, which has 7-8 spines. 



4. Of the other Australian species (aside from L. angasi], L. viridis 

 Baird (1850, p. 254, pi. 17, f. i) from Tasmania has a distinct carina of 

 the scutum, and the caudal flap is oval (narrower at the base). L. viridu- 

 his Tate (1876, p. 136, and Brady, 1886, page 88, textfig. E) from Ade- 

 laide has the abdomen very short, and the caudal flap is distinctly spatu- 

 late. 



5. The two New Zealand species, L. kirki and compressus Thomson 

 (1879, p. 260, pi. 11, f. 4, 5) are also distinctly different: in L. kirki a 

 much larger part of the abdomen is covered, and, although the caudal 

 flap resembles somewhat that of L. hatcheri, it is shorter. L. compressus 

 is entirely different in the shape of the scutum, which is oval and narrow, 

 keeled only posteriorly ; the caudal flap is much shorter and the margin 

 of the scutum is smooth. 



Thus there only remain for comparison L. apus from central and 

 northern Europe, and L. angasi from South Australia. Of these, L. apus 

 (L.) resembles our species in general form, length of abdomen (8 exposed 

 segments), in the character of the carina of the scutum ; but it differs : 



1. In the second cervical furrow, which is interrupted in the middle. 



2. In the caudal flap, which is oval, narrower at the base, and about 

 twice as long as wide. 



