360 THE AMERICAN NATURALIST [Vol. LV 



Mueller's Folliculina, but the form is evidently so dif- 

 ferent in each of the four that they may be thought of as 

 greatly shortened Semi folliculina hoecki in which a pre- 

 mature change of axis in secreting has made the sac very 

 deep where passing over into the tube, which is then 

 expressed as part of "the sac and left unfinished. The 

 whole is like a short club foot with swollen ankle. 



For the present all the known normal material from 

 the coast of New England (except that referred to by 

 Dons as S. planorbis) may be regarded as belonging to 

 those forms described by the name Semi folliculina boecM 

 and closely akin to the original Folliculina ampulla of 

 most authors. 



Turning now to the southern coast, the bottle animal- 

 cules first seen by Ryder in the Chesapeake were referred 

 by him to Freia producta of Strethill Wright, September 

 3, 1880. This animal 1,000 long extended and 100 when 

 contracted has a dwelling compared to a stocking with 

 spiral ribbon of four to twenty-four turns to the right. 

 Found in vast numbers on oyster shell with Bryozoa, its 

 occurrence agrees with that later reported up the bay by 

 the present author. What is evidently the same form 

 has been seen by me in the Severn and other parts of the 

 Chesapeake Bay in 1912-15 and described without specific 

 identification. 



In Dons's classification these Chesapeake forms are 

 evidently Semifolliculina and might be included in the 

 Avidely variant S. boecM, but that the tube is so much 

 longer and the collar so relatively narrow. 



Moreover, it has the gregarious habit described by 

 Wright, the free-swimmers being stuck together in a 

 secreted colletoderm," and may be identified as the 

 same as his Freia {Lagotia) producta, if we grant that in 

 his sketch of the animal and bottle he overemphasized the 

 " immensely prolonged " tube in proportion to the sac, 

 which he figures as relatively too short for his compari- 

 son to a jack boot. 



If, then, we may retain the name producta as signify- 



