NATURAL HISTORY OF SOME TUBE-FORMING ANNELIDS. 235 



selves in two. The posterior part squirmed and contorted itself vigorously for a 

 considerable time. The anterior parts of the divided specimens immediately began 

 to form new tubes in an apparently normal manner. This result recalls the interest- 

 ing experiments of the late Professor Norman. 



One specimen was found, on opening the natural first-formed tube several days 

 after it had been collected, to have a very minute regenerated head and the first five or 

 six somites. I could not be sure, however, that the head had regenerated in captivity. 



For many kindnesses offered while making these observations I desire especially 

 to thank Professor R. Ramsay Wright, in charge of the Dominion Biological Station 

 at Canso, Nova Scotia, and also Dr. H. M. Smith of the U. S. Fish Commission Sta- 

 tion, Wood's Hole, Mass. 



III. BIBLIOGRAPHY. 



Audouin, J. V., et Milne-Edwards, H. 



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 Miiller, F. 



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Naturg., Jahr. 24, Bd. 1, pp. 211-220, Taf. 6-7. 

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'73. Report upon the Invertebrate Animals of Vineyard Sound and the Adjacent Waters, with an Account 

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