190 BULLETIN OF THE 



Very small specimens show this species to go through changes similar to 

 those of Brissopsis. They are quite cylindrical when measuring about 75. 

 mm. in length. 



Lat. 37° 42' S. Long. 56° 20' W. 44 fathoms. 



Lat. 51 26 " 68 56 55 fathoms. 



Off' Cape Dos Bahias 55 fathoms. E. coast of Patagonia. 



Cambridge, January, 1873. 



