72 



Sagitta pulchra Doncaster. 



Lücal i t ies : 



Malay (Siboga area) and Maldive Archipelagos. 



Definitive observations: 



Xeritic. 

 Surface. 

 Temperaturc : 28° to 29° C. 



Sagitta regularis Aida. 



Local i t i es : 



Malay (Siboga area) and Maldive Archipelagos; Japan. 



Definitive observations: 



Neritic. 

 Surface. 

 Temperature: 28° to 29°, and M.A. 21° C. 



Sagitta robusta Doncaster. 



L O c a 1 i t i e s : 



Malay (Siboga area) and Maldive Archipelagos. 



Definitive observations: 



Neritic. 

 Surface. 

 Temperature: 28° to 29° C. 



Sagitta serratodentata Krohn. (Charts IV to VI). 



L o c a 1 i t i e s : 



Temperate (N. and S.) and tropical Atlantic; and Mcditerranean, Southern Ocean, Tropical 

 Indo-Australian Ocean, and Japan. 



Definitive o b s e r v a t i o n s : 



Xeritic and Oceanic. 



N. limit: 6o°i2'N., 22°s6'W. 



S. limit: 53° o' S., 70°40'W. 



Surface and Mcsoplankton. 



Deepest haul: 364 to 182 m. at 1 1° 5 C. 



Highest temperature: 32° C. 



Lowest temperature: M.A. 6° 5 C. 



In s])it<' nf the wide rant^e (jf temperature, and the wide horizontal distribution, there is 

 at present a marked nortlicrn limit to this very characleristic species at aboiit 60° N. It has so 

 far failed entirely in iht- north-eastern arclic arm of the Atlantic, althouj^h collections from that 

 region have been (comparatively speakin<^) numcrous. 



It is curioiis that while the records show it to be markedly eiirylhermai, ihey do not 

 püint to its being correspondingly eurybathic; the deepest record is shallow for a species which 

 can tolerale the temperature of the b'alkland Islands and Strails of Magellan. 



