30 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



preceding segment, slightly shorter than fiirca. Rostrum absent. 

 First antenna reaches to fourth segment of abdomen. Left antenna 

 geniculate. Endopod of second antenna about equal in length to 

 exopod. First endopodal segment of mandible with row of spines. 

 Mandible palpus elongate, blade with two subequal teeth. First 

 maxilla reduced, endopod (?) with two setae. Second maxilla and 

 maxilliped with reduced number of setae. Exopods of swimming 

 feet 3-segmented, endopod of first foot 2-segmented, of second to 

 fourth feet 3-segmented. Spine of first exopodal segment of first 

 foot large and elongate. Fifth feet biramous, exopods 3-segmented, 

 endopods 2-segmented. Penultimate segment of left exopod indented 

 on internal side. Total length 1.16 mm. 



Remarks: The genus Disco was described by us (Grice and 

 Hulsemann, 1965) on the basis of female specimens collected in 

 the North Atlantic Ocean. D. inflatus has not been previously 

 reported from the Indian Ocean. 



Disco species 



Figures 162-173 



Diagnosis (male) : Head and first thoracic segment incom- 

 pletely separate, foiu'th and fifth thoracic segments fused. Anal 

 segment longer than preceding segment and furca. Rostrum absent. 

 Left antenna geniculate. Endopod of second antenna % the length 

 of exopod. Mandible palpus elongate, blade with spinelike hairs 

 and three spiniform teeth. First maxUla well developed, internal 

 lobe bearing one seta, exopod with four setae, and second basal 

 segment with one seta. Second maxilla and maxilliped with reduced 

 number of setae. Exopods and endopods of first and second feet 

 3-segmented. Third and foiu'th feet broken off. Fifth feet bira- 

 mous, exopods 3-segmented. Endopod of right foot 3-segmented, 

 of left foot 2-segmented. Total length .80 mm. 



Remarks: It appears that the present specimen is referable to 

 the genus Disco, but probably not to either of the two described 

 species {D. longus, D. minutus) in which the male is unknown. The 

 present male differs from these two species in the absence of a rostrum 

 and in the segmentation of the endopods of the first and second 

 swimming feet. It seems preferable not to refer the male to either 

 species as it may represent the male of an undescribed species of Disco. 



Euaugaptilus brodskyi Hulsemann, 1967 



Figures 174-179 



Remarks: We found one female measuring 6.83 mm in length, 

 which wo believe is Euaugaptilus brodskyi. The mandible, first and 



