•THEAICFmCOpE- 



:ArED 



Vol. XI. 



TRENTON, N. J., SEPTEMBER, 1891. 



No. 9. 



ORIGIMAL 



ConnvMiCATioris 



THE HISTOLOGY OF LUMBRICUS, OR THE EARTH- 

 WORM.— 11. 



HENRY L. OSBORN, PH.D., 

 PROFESSOR OF BIOLOUY, HAMLINE UNIVERSITY. 



PLATE IV, IN AUGUST NUMBER. 



rpHE pen refuses to represent fully the cappearance of a much- 

 A magnified section, but Fig. 3 will resemble the section of 

 your own preparation sufficiently to permit identification of the 

 subjects ©f remark. The section is a picture such as can be 

 found at many places on a series of sections ; we may suppose 

 it is a much higher amplification of part of Set. K, of Fig. 2. 

 In it we find the structureless cuticle cu., a secretion hardened 

 above the outer ends of the cells in the layer just beneath. The 

 cuticle is not a cellular membrane. This is shown by its homo- 

 geneous character. If it were a layer of cells, their nuclei or 

 traces of them could be seen, and the fact would be still better 

 displayed by surface preparations of the cuticle. Such views 

 show the cuticle, however, to be dotted with minute pores, 

 17 



