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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 69 



ture form (Tattersall, 1924). I have no information as to the times 

 at which the hauls of the Bache were made, but the evidence pro- 

 vided by the above records of this species would suggest that they 

 were made during daylight. It therefore seems possible to suggest 

 that T. tricuspidata is an epiplanktonic species, with a maximum 

 occurrence at about 100 meters during the hours of daylight, rising 

 to the surface at night. 



14. THYSANOPODA MONACANTHA Ortmann 



OccuiTeuxe 



Bemarks. — With the single exception of the specimen captured at 

 Station 10158, 600 meters, this species vfas confined to the oceanic 

 area. None occurred at a greater depth than 500 meters (with the 

 exception noted) and none nearer the surface than 75 meters. As far 

 as these records go, it was most abundant between 75 and 100 meters. 

 All the specimens captured at 75 meters were less than half grown, the 

 largest measuring 17 mm.; but complete adult specimens of 32 mm 

 occurred at 100 meters. 



15. THYSANOPODA AEQUALIS Hansen 



Occurreiice 



• Surface. 



'Many. 



