BIOLOGICAL BULLETIN, VOL xxx. 



PLATE I. 



8.4-5 p.m. * 



S.i 5 p.m. 



9.30p.m. j 



9.4-5 p.m f 



10 p.m. 



10.15 pm. 



10.30p.m. g 





n.15 p.m. * i 



C. C. MACKLIN. 



