28 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



Scolecithricella species 



Figures 124-125 



Diagnosis (male): Head and first thoracic segment fused, fom-th 

 and fifth thoracic segments separate. First antenna reaches end of 

 second abdominal segment. Right fifth foot uniramous, 2-segmented. 

 Left foot biramoiis, exopod 3-segmented, endopod 1-segmented. 

 Total length .72 mm. 



Remarks: The single male specimen is probably referable to a 

 described female of this species. We therefore will not offer it as 

 a new species. 



Scolecithrix fowleri Farran, 1926 



Figures 12&-129 



Diagnosis (male) : Head and fu'st thoracic segment fused, fourth 

 and fifth thoracic segments separate. Large, ventrally directed 

 rostrum. Fifth feet biramous. Right foot with 3-segmented exopod, 

 2-segmented endopod. Left foot with 3-segmented exopod and 

 1-segmented endopod. Total length 1.G2 mm. 



Remarks : The male of this species has not been heretofore known. 

 Our findings of Scolecithrix fowleri represent a new record for the 

 Indian Ocean. 



Metridia boecki? Giesbrecht, 1889 



Figures 130-133 



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

 and fifth thoracic segments fused. Posterior lateral corner of fifth 

 thoracic segment with small protuberance. First antenna reaches to 

 end of second abdominal segment. First segment of left first foot 

 with pubescent swelling. Total length 1.95-2.01 mm. 



Remarks: The five male specimens here tentatively recognized as 

 belonging to M. boecki differ slightly from M. discreta by the large 

 swelling on the first segment of the left fifth foot. 



Metridia hrevicauda Giesbrecht, 1889 



Remarks: The fifth pair or feet of several female specimens were 

 observed to have four rather than three segments. In other respects 

 they agreed with M. hrevicauda. 



Metridia effusa, new species 



Figures 134-143 



Occurrence: Station 108 Be, 2000 to 1000 m, 1 9; 134 Be, 2000 

 to 1000 m, 11 99, 6 cf cf"; 140 Be, 2000 to 1000 m, 2 99. 



Diagnosis (female) : Head and first thoracic segment incompletely 

 separate, fourth and fifth thoracic segments fused. Anterior end of 

 head pointed, posterior lateral corner of fifth thoracic segment rounded. 



