ISOPODS OF NORTH AMERICA. 



485 



FIG. 542. MUNNA CMCA.. 

 FIRST LEG. x 15j. 



surface. A long, conspicuous spine projects forward on either side of 

 the first thoracic segment at the place of union of the lateral part of the 

 segment with the dorsal portion. The same occurs on the third segment. 



The abdomen tapers to a bluntly pointed extrem- 

 ity. About two-thirds the distance between the base 

 and the extremity are two strong tubercles, one on 

 either side of the median line. On either side of 

 the median line, where there is a comparatively 

 smooth area, the surface.of the abdomen is covered 

 with long and short spines. There are also two 



long spines on 

 either side of 

 the lateral mar- 

 gin near the 

 middle of the 

 segment, and 



numerous ones near the base. 

 The first pair of legs are pre- 

 hensile. All the others are ambu- 

 latory, and very much elongated. 

 The uropoda are small, almost 

 inconspicuous, single-branched, 

 and composed of only one tiny 

 article. 



A single specimen of this species was collected by the U. S. Bureau 

 of Fisheries steamer Albatross at Station 4390, off Santa Catalina 

 Islands, coast of southern California, latitude 33 2' 15" north, longi- 

 tude 120 42' west. Depth, 2,182 fathoms. The type is in the U. S. 

 National Museum, Cat. No. 32072. 



Family XIX. MUNNOPSID^R. 



Eyes wanting. Two divisions of thorax sharply defined. 



First pair of antennae with flagellum well developed. Second pair 

 of antenna very much elongated. 



First pair of legs generally smaller than the others, never subcheli- 

 form; three following pairs very much elongated and ambulatory in 

 character; last three pairs of legs natatory in character, with some of 

 the joints flattened and expanded, and fringed with plumose hairs. 



Uropoda small. 



Pleopoda as in the Janiridse. 



FIG. 543. MUNNA C.ECA. SECOND LEG. 



See Sars for characters of family, Crust, of Norway, II, 1899, p. 131. 



