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THE AMERICAN NATURALIST [Vol. XLVII 



Harbor, where, so far as known, they are coincidently 

 distributed. 



In the Siboga area Fowler ('06) records 45 surface 

 hauls containing either one or the other species. Of 

 these, 35 contained S. neglecta but not 8. regularis, and 

 6 contained S. regularis but not S. neglecta. In only 4 

 hauls were both species obtained. When we remember 

 the large area covered by this expedition these results 

 point toward contiguous and slightly overlapping, rather 

 than coincident distribution. 



The two expeditions of the Pola to the Bed Sea ob- 

 tained both S. neglecta and S. regularis. The collections 

 of the first expedition (1895/96) were made in an area 

 limited by 21° 27' and 29° 45' N., and 32° 30' and 38° 30' 

 E., while those of the second (1897/98) were made some- 

 what further south and east within the limits of 15° V 

 and 28° 42' N., and 32° 56' and 42° 31' E. Ritter-Zahony 

 ('09) records 32 surface hauls made during the first ex- 

 pedition that contained one or other of the two species. 

 Of these, 25 contained only 8. regularis, 6 only S. 

 neglecta, while in but one haul were both species taken. 

 During the second expedition 27 surface hauls were made 

 of which 12 contained 8. neglecta only, 10 S. regularis 

 only, and 5 contained both. These data strongly suggest 

 that the two species are distributed in contiguous re- 

 gions which overlap considerably along the edges. 



Of the other expeditions, the Biscayan, Plankton and 

 National failed to catch either species. The Gauss ob- 

 tained both in the region of Port Natal, but never in the 

 same hauls. Doncaster ('02) records both under the 

 names of S. septata and S. bedfordii from the Maldive 

 and Laccadive Archipelagoes, but nothing is stated as to 

 whether they were obtained in the same hauls or not. 

 Ritter-Zahony ('10a) records S. regularis from Sharks 

 Bay, Australia, but failed to find S. neglecta. 



