NO. 4 SCHULTZ: ISOPODA 17 



Cnathia clementensis, n. sp. 



(Plate 10) 

 Diagnosis: Eyes of medium size and stalked. Cephalon wider than 

 long with many large tubercles. Entire width of peraeonal segment one 

 barely visible in dorsal view. Frontal margin of cephalon with two me- 

 dial lateral projections and with at least four small lobes on the median 

 anterior projection. First three peraeonal segments and anterior part of 

 fourth covered with tubercles. Body, especially anterior part, with many 

 long hairlike setae. Pleonal segments with some tubercles and with two 

 sets of pointed lateral projections. Pylopod triarticulate with minute api- 

 cal segment; many large plumose setae along medial margin of opercular 

 segment. First walking peraeopod with two sensory spines on propodus 

 and one on carpus. Antenna one with seven flagellar articles; antenna 

 two with five articles. Alaxilliped with many large plumose setae along 

 lateral margin; blade with two coupling hooks; blade slightly longer 

 than third segment. Mandible large, when extended forward about 

 three-fourths length of cephalon ; cutting edge inconspicuously toothed. 

 Pleopods without setae. Second male pleopod with small copulatory 

 organ near base of endopod. Uropodal rami with many large lateral 

 setae and with many long plumose setae ; endopod longer than telson. 



Measurements: Holotype male 8.5 mm long. 



Type locality: 6840(1); San Clemente Canyon; 162 m; Jan. 30, 

 1960. "Campbell grab took small sample containing manganese nod- 

 ules". Lat. Zl"" 44' 35"N, Long. 118° 12' 45"W. 



Distribution: Known only from type locality. 



Affinities: The new species is somewhat like Gnathia productatridens 

 Menzies and Barnard (1959) but differs from it in the general struc- 

 ture of the frons, which is not produced and carries four lobes. 



Cnathia coronadoensis, n. sp. 



(Plate 11) 

 Diagnosis: Eyeless. Body smooth without any conspicuous tubercles 

 or hairlike setae. Cephalon longer than wide; posterior part raised with 

 two large dorsolateral projections; anterior part of cephalon greatly 

 depressed. Bottom of cephalic depression with prominent oval ring ap- 

 pearing to communicate with the mouth cavity below. Frontolateral su- 

 perior process with spinelike setae on margin. First peraeonal segment 

 continuous in outline with cephalon. Lateral margins of pleonal seg- 

 ments bent sharply downwards and slightly incurved. Telson acutely tri- 



