U. S. NATIONAL MUSEUM 



BULLETIN 100, VOL. 2, PART 3 PL. 25 



rj.26. 



Fi^.27 



Fy.28. 



r, +* ■ 



rcg.23. 



P' kflX&jS&'&vi) 



Pyrosoma ovatum. 



For explanation of plate see page 271. 



