Sagitta macrocephala Fowler. 



Locali t ies : 



Faeroe Channel; Bay of Biscay; Siboga area. 



Definitiveobservations: 



Oceanic, mesoplanktonic '), 

 Highest closing net; 877 to 639 m. 

 Lowest closing net; 3657 to 2742 m. 

 Highest temperature; 10° C. 

 Lowest temperature; 2° 5 to 3° C. 



So far as it is at present known, this species is purely mesoplanktonic, but it is not 

 impossible that it may come to the surface in polar waters. lts occurrence in the Faeroe 

 Channel and in the Siboga area woulcl seem to indicate a wide distribution in intermediate 

 seas at considerable depths. 



Sagitta minima Grassi. 



Local i t i es : 



Mediterranean and (?) Japan. 



D e f i n i t i V e o b s e r v a t i o n s : 



Neritic. 



Surface at M.A. 19° and 21° C. 



Sagitta neglecta Aida. 



L o c a 1 i t i e s : 



Malay Archipekigo and Japan. 



Definitive observations: 



Neritic. 



Surface at 28° to 29° C, and M.A. 21° C. 



Sagitta planctonis Stcinhaus. 



L o c a 1 i t i e s : 



Tropical [and ? temperate N.] Atlantic. 



Definitive observations'); 



Neritic and oceanic. 



N. limit: i°46' N., i7°i8'W. 



S. limit: i6°5o'S., 12° E. 



Surface. 



Highest temperature : 27° C. 



Lowest temperature: 18° 8 to 20° C. 



i) Omitting some doublful young specimens at higher levels. 

 2) Omitting the very doubtful Biscayau and Siboga records. 



