ISOPODS OF NORTH AMERICA. 



485 



Fig. 542.— Munna c.kca. 

 First lec. x 15j. 



surface. A long-, conspicuous s])inc j)r()jocts forward on cither side of 

 the first thoracic segment at tlie place of union of th(> lateral part of the 

 segnientwith the dorsal portion. The same occui's on th(> tliii-d segment. 



The ahdomen 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 a})domen 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 ver}" much elongated. 

 The uropoda are small, almost 

 inconspicuous, single-branclied, 

 and composed of only one tiny 

 article. 



A single specimen of this species w^as collected by the U. S. Bureau 

 of Fisheries steamer Alhatross at Station 4390, oti' 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.^.« 



P^yes wanting. Two divisions of thorax sharply defined. 



First pair of antenna? with tiagellum well developed. Second pair 

 of antenna^ very nmcli elongated. 



First pair of legs generally smallcM" than the others, never sulx-hi^li- 

 forni; three following pairs very much elongated and ambulatory in 

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

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



I'ropoda small. 



Fleopoda as in the Janiridm. 



543.— MuxNA QMCA.. Second leg. x 15^. 



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



