NO. 3583 COPEPODS — GRICE AND HULSEMANN 25 



EucJiaeta robusta (Wolfenden, 1911) 



Remarks: Our female specimen differs from Wolfendcn's (1911) 

 original description by the absence of hair on the fifth thoracic seg- 

 ment and by a longer second abdominal segment. The first three 

 abdominal segments have a relative length of 20:10:10. Wolfenden 

 gave a ratio of 20:17:15 for his specimens. Our specimen measm'ed 

 7.85 mm, WoKenden's 7.8 mm. 



Xanthocalanus htspidus, new species 



Figures 71-79 



Occurrence: Station 355 NV, 2000 to 1000 m, 1 9. 



Diagnosis (female) : Head and first thoracic segment fused, fourth 

 and fifth thoracic segments incompletely separate. Ratio of cepha- 

 lothorax to abdomen 4:1. Posterior lateral corner of fifth thoracic 

 segment somewhat protruded and rounded. Rostral filaments pres- 

 ent. Fu'st maxilla with two setae on second inner lobe, two setae on 

 thu"d mner lobe, two setae on second basal segment, eight setae on 

 endopod and five setae on exopod. Second maxilla with sensory 

 appendages, coarse setae broken off. Maxilliped setose. Spines on 

 external margin of exopods of first foot long and seta-lilve. Exopods 

 and endopods of second through fourth feet broken off. Fifth feet 

 2-segmented. Distal segment with three spines and one spinelike pro- 

 trusion. Scattered spines on surface of segment and at junction of 

 first and second segment. Total length 1.00 mm. Holotype: USNM 

 113518. 



Remarks: This species resembles X. paraincertus Grice and Hulse- 

 mann, but the two may be distinguished by the segmentation and 

 structure of the fifth feet. X. hispidus has 2-segmented fifth feet and 

 two short outer spines on the terminal segment. A', paraincertus has 

 3-segmented fifth feet and two long outer spines on the terminal 

 segment. 



Amallothrix indica Sewell, 1929 



Figures 80-82 



Diagnosis (male) : Left fifth foot nearly twice as long as abdomen. 

 Basal segments of left foot very elongate, exopod 3-segmented, 

 endopod 2-segmented. Right foot only slightly longer than first 

 basal segment. Exopod 2-segmented, endopod 1-segmented. Total 

 length 2.68-3.10 mm. 



Remarks: The male of this species resembles Amallothrix emarginata 

 (Farran) but the right exopod of the latter species exceeds the length 

 of the left exopod. In A. indica the right exopod is quite short. The 

 male of this species has not heretofore been described. 



