118 U.S. NATIONAL MUSEUM BULLETIN 260 



Relationship. — This species resembles Monoculodes necopinus, new 

 species, but the gnathopodal hands are more strongly expanded, the 

 posterior lobe of article 5 on gnathopod 2 is shorter, the head is broader, 

 the rostrum shorter, and the posterior lobe of article 5 on gnathopod 

 1 is more massive. Monoculodes recandesco is related to 31. abacus 

 J. L. Barnard (1961) and M. latissimanus Stephensen (1931) but the 

 telson apparently has distal setae and not stout spines, the gnathopodal 

 hands are slightly narrower, the rostrum shorter, and the lateral 

 cephalic lobes are broader than in the other two species. Article 2 

 of pereopod 3 is more strongly expanded in M. latissimanus than it is 

 in M. recandesco. 



A resemblance is shown to M. diamesus Gurjanova (see 1951) but the 

 posterior lobe of article 5 pf gnathopod 1 is broader and scarcely 

 notched at the distal base in M. recandesco, the rostrum is shorter and 

 the lateral cephalic lobe is very broad, trmicate, and not acutely pro- 

 duced. Monoculodes semenovi Gurjanova (see 1951) bears eyes, the 

 rostrum is longer, the lateral cephalic lobe narrower and less fully 

 incorporated in the head, and article 6 of gnathopod 2 is broader than 

 in M. recandesco. 



Monoculodes (?) sudor, new species 



FlQtTEE 56 



Diagnosis. — Eyes absent; rostrum long, slender, straight, acute, 

 reaching to apex of article 1 of antenna 1 ; lateral cephalic lobe with 

 subacute apex, lobe compressed slightly dorsalwards; antenna 2 

 scarcely longer than antenna 1, both antennae slender and lacking 

 large spines, pedmicles strongly setose, setae not plumose ; peduncular 

 article 2 of antenna 1 longer than article 1 ; posterior lobes on fifth 

 articles of giiathopods short, not massive, slightly geniculate, thus 

 pointing slightly distalwards, about equally developed on both pairs 

 of gnathopods ; gnathopods relatively slender for the genera Oedicer- 

 oides and Monoculodes, intersimilar, gnathopod 2 slightly longer than 

 1, fourth articles with slight posterodistal protuberances, subacute on 

 gnathopod 2 ; dactyls of pereopods 1 and 2 slightly longer than sixth 

 articles; gnathopodal hands not strongly expanded, palms and pos- 

 terior margins of sixth articles equal ; coxa 4 very large, broad, slightly 

 longer than anterior coxae, posterior edge slightly oblique, nearly 

 straight, posteroventral corner sharply quadrate and slightly extended 

 posteriorly ; coxa 1 large, strongly extended forward ; article 2 of per- 

 eopod 5 evenly tapering distally, posteroventral corner scarcely pro- 



