52 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, I28 



on its outer margin; third joint longer than the second. Maxilla i 

 much as that figured by Sars for M. palmata (1894, pi. 179™^) ; inner 

 lobe long with narrow angular apex and the inner margin bearing a 

 row of setae ; outer lobe normal ; first joint of palp with 3 groups of 

 long slender spines on outer margin; second joint large, widening 

 distally and with the broad, slightly convex distal margin bearing 

 many slender spines. Maxilla 2 much as that figured by Sars for 

 M. palmata (1894, pi. 179™-), but inner and outer lobes are of equal 

 width, with inner lobe being slightly shorter. Maxilliped, inner lobe 

 reaching beyond middle of outer lobe and armed with the usual spines, 

 but no teeth ; outer lobe long, reaching about to the end of the second 

 joint of palp, armed distally and on the inner margin with spines 

 which become shorter toward the base. 



Gnathopod i, second joint a little longer than the fifth, which is 

 longer than the sixth; all joints with many long setae; sixth joint 

 with front and rear margins convex; palm oblique, convex, finely 

 dentate throughout, armed throughout with closely set short spinules, 

 and without defining angle or defining spines. Seventh joint fitting 

 palm and provided on inner margin with very fine setae or spinules. 

 Gnathopod 2 very large and robust; sixth joint about as long as the 

 second to fifth joints combined ; palm very oblique, armed with 2 large 

 teeth, several small teeth, and a strong defining tooth. Seventh joint 

 strong and curved with the distal end resting on the inside surface 

 of the sixth joint when it is closed against the palm. 



Peraeopods i and 2 alike but i slightly the longer. Peraeopods 3 to 

 5 increasing consecutively in length, second joint expanded, somewhat 

 produced below posteriorly, and with hind margin very finely serrate. 

 The mesosome segments and first metasome segment are without 

 dorsal teeth. Metasome segment 2 has 5 dorsal teeth, and segment 3 

 has 5 dorsal teeth and a small tooth just above the lower posterior 

 angle. Urosome segment i has 3 dorsal teeth ; segment 2 has 4 dorsal 

 teeth and segment 3 has a mere suggestion of 2 dorsal teeth. The 

 uropods are shown in figure 15, & and i. The telson extends to about 

 the end of the peduncle of uropod 3, and is cleft to its base with each 

 lobe ending in a central triangular lobe, on either side of which is a 

 spine. Length of male 28 mm. 



Type. — A male, U.S.N.M. No. 93809, taken from beach at Point 

 Barrow, Alaska, September 28, 1950, Ira L. Wiggins, collector. 



Remarks. — In the smaller male the armature of the palm of gnatho- 

 pod 2 is somewhat different from the larger male, the arrangement 

 giving the impression of 3 major teeth. 



