No. 639] AMERICAN FOLLICULINAS 



ing a long spiral tube with narrow collar, we will separate 

 it from the other four species 8. gigantea, S. planorbis, 

 S. similis and S. hoechi recognized by Dons and may add 

 the characteristic feature of the animal that its nucleus 

 is generally moniliform and the lobes very long and ligu- 

 late so as to be compared to the ears of a hare in length by 

 Wright and from their curvature of surface to blades of 

 obstetrical forceps by Ryder— far removed from the fun- 

 nel appearance of many of the smaller and earlier forms 

 that had been described. 



Tubes that have had second additions added to them, 

 described by Wright, were also sometimes observed both 

 by Ryder and by Andrews. 



While the ordinary form of the Chesapeake is thus a 

 much longer tube and markedly spiral as compared to the 

 simple New England form, so that it may be provision- 

 ally regarded as specifically distinct and referred to 

 Semifolliculina producta, there are also other forms of 

 bottles occurring sparingly with the long tubes that are 

 more simple and short than the New England forms, 

 though they may have an added complexity regarded by 

 Dons as a sort of valve and relegating them to the genus 

 Parafolliculina. 



Of the two species recognized by Dons the Chesapeake 

 form is evidently Parafolliculina amphora. Character- 

 ized by the wide flat sac attached along its lower face to 

 substratum and joined to short tube which swells out 

 around mouth of sac and then rapidly diminishes to end 

 with upward turn and narrow mouth with little or no 

 collar. The whole enveloped for the most part in a halo 

 of soft secretion and the junction of sac and tube char- 

 acterized in many specimens by an internal valve-like set 

 of membranes or modifications of the edges of the sac 

 where jutting into the swollen tube. The animal is sim- 

 ple witli single nucleus and short arms or funnel and 

 nearly col()rlo^;>;. 



'I'lic nicasurciiu'iits given by Dons for specimens from 

 Norway and Iceland are: length over all 110 to 150, of 



