﻿128 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 102 



Second antenna. — Basal flagellar segments pink in life. 



MaxilUped. — ^With three coupling hooks. 



First maxilla. — Outer lobe with 12 setae, inner lobe with 4 apical 

 setae. 



Second maxilla. — Each of the two outer lobe lappets with 4 apical 

 setae, inner lobe with about 13 large setae. 



Mandible. — Left mandible incisor with five teeth, lacinia with four 

 teeth, setal row with four setae. Right mandible lacking lacinia, 

 incisor with four teeth, setal row with four setae. Terminal article of 

 palp with three denticulate setae at apex. Molar process expanded at 

 apex. 



Adult male griathopod. — With two blunt teeth on cutting edge of 

 propodus and two longer teeth on cutting edge of carpus. 



Siibadult male gnathopod. — Resembles female gnathopod. A pair 

 of pectinate scales present near inner margin of dactyl, propodus, 

 and carpus. Number of 2-pointed setae appears variable, depending 

 on size of specimen. 



Types. — Type locality, Komandorskie Islands, seashore, Bering Sea. 

 The types are located in the collections of the Zoological Museum of 

 the Academy of Sciences, U. S. S. R. 



Geographical distribution. — Bering Sea to Carmel Cove, Monterey, 

 Calif. 



Material examined. — Eleven male and 22 female specimens were 

 examined that had been collected from various localities in Marin and 

 Monterey Counties, Calif. 



Remarks. — In juvenile specimens the very minute terminal article 

 of the flagellum of the first antenna of the adult appears much longer 

 and wider and is obviously a separate article (compare figs. 54, a^ and 

 54, h). The aborted appearance of that article correlates with the 

 development of a sensory filament at the apex of the penultimate 

 flagellar article. This filament is lacking in very small specimens. 

 As was earlier mentioned Gurjanova did not consider the minute article 

 as a separate ^article in her description of M. stephenseni. 



MUNNA CHROMATOCEPHALA, new species 



Figures 52, 53 



Holotype. — Adult male, length 2.2 mm., width 0.4 mm. 



Allotype. — Ovigerous female, length 1.5 mm., width 0.7 mm. 



Diagnosis. — Eyes bulging only very slightly, preorbital area almost 

 contiguous with the lateral extent of eyes. Pleotelson smooth, lacking 

 2-pointed setae on lateral borders. Body covered with setae, espe- 

 cially on the dorsal surface of the pleotelson. Flagellum of first 

 antenna composed of three articles, penultimate article scarcely ex- 

 ceeding twice the length of first article; last two flagellar articles 



