are so un: 



before sections 

 inves . . r observe ius 



, '37, "40), Vogt i 



vai icroscope, missed 



Li v structu . . observers, Brook, Icl 



('02) hi; sections but 



now, since it is 



deve^_ s organ lat 



now o 



This hag . been described in the fi of 



r, but it may be well to emphasize 

 process is such as vent abso] it act of the 



. 



III. 



floridae . as befoi 

 possesses shell Pais 



. 

 e-r ■ ;d in its Lese 



surrounded ii a thin ellicle : 



color 



