356 



THE AMEBIC AN NATURALIST 



[Vol. LV 



ure and the description of " vase-like tube " emphasizes 

 the short neck of the bottle and makes the reference to 

 S. gigantea doubtful. 



A second Semifolliculina is known on the statement of 

 Dons to have been found in material from the eastern 

 coast of America, and this is his S. planorhis, character- 

 ized by very narrow tube and wide sac. This is sug- 

 gestive of some of the apparently depauperate or dwarf 

 forms occasionally met with in the Chesapeake and may 

 prove to be but a transitory condition due to conditions 

 of food or other factors and not a permanent form. 



The folliculina found at Woods Hole, Mass., has not 

 been described. In 1914 Dr. Elmer J. Lund observed 

 these Folliculinas on stems of Campanularia, Euden- 

 drium and Biigula from the wharf of the Bureau of Fish- 

 eries and in letters to me sketched the sac and tube with 

 expanded lips and absence of spiral. Apparently the 

 form and proportions are much as in the sketch of Leidy, 

 but with longer tube. Professor Lund observed the free- 

 swimming forms several times during the summer in 

 various cultures and saw the formation of new bottles 

 in June. 



Some preparations of Obelia mounted many years 

 since, probably at Woods Hole, Mass., about 1888, and 

 very likely by Professor Brooks, have yielded me several 

 specimens of Folliculina that are evidently the same 

 forms as those seen by Lund and probably the same as 

 those of Leidy. The animals are exceptionally well pre- 

 served, in dwellings that give the following measure- 



1. One sac attached its whole length to Obelia is 175 /x 

 long and 50 fi deep, while the tube arising from it nearly 

 at right angles is only 50 /x above the top of the sac, is 

 37 fi wide and flares out at the lip to a width of 62 fi. The 

 animal drawn into its sac is 162 long and 35 mm. in 

 mcatcst diameter, with spheroidal macronucleus 15 m- in 

 (linim tci-. The ligulate lobes are 75 /* long and 12 wide 

 mu\ plainly show the characteristic adoral zone proceed- 



