U. S. NATIONAL MUSEUM 



BULLETIN 100, VOL. 2, PART 3 PL. 24 



oea. 



Flo. 22. 



n 3 .24. tl 9- 



Pyrosoma operculatum i Figs. 21 23> and P. aherniosum (Figs. 24 and 25). 



FOR EXPLANATION OF PLATE SEE PAGE 271. 



