"^'1893^'] PROCEEDINGS OF THE NATIONAL MUSEUM. 465 



cific position to tlie representatives taken by the Albatross, since no 

 close at;TOonuMit between theni could be made; and this was doubtless 

 due to the ditfereuce in locality; for specimens in the museum at Yale 

 were of lanthinidu- from the region of the Sandwich Islands, in the 

 Pacific side, and from the Arctic regions of the Atlantic side; while 

 these from tlie Albatro.ss collections of the ecjuatorial regions belonged 

 to different S])ecies which possessed intermediate qualities of ditfeient 

 kinds, such as a different comi)ression of the spiral, shai>e of aperture, 

 etc. From the tact, tlK-refore, that they do show distinctions from ma- 

 terial collected at other ]>oints, the representatives of this group illus- 

 trate also the segregation and the localization of pelagic; mollusca in 

 given areas, broadly speaking. Althougli lanthinida' Avere so widely 

 distributed, no empty shells were taken from bottom (iollecting. 

 BioLocriOAL Laboratory 



Williams College, April, ld93. 

 Proc. X. M. 93 30 



