200 



HYALONEMA (HYALONEMA) AGASSIZI. 



Fig. 8. 



establishment of separate varieties. The distinction of different foryns within 

 the species, designated A, B, C, D, E, and F, is a sufficient division. 



The species composed of these six forms is most closely allied to the Hya- 

 lonema (Hyalonema) obtusum and the Hyalonema (Hyalonema) polycaulum. 

 The outer appearance of the variety gracilis of H. (H.) obtusum is indeed nearly 

 the same as that of form A. These latter differ, however, from H. (H.) obtusum 

 in the following respects: — the dermal pinules are considerably longer in both 

 varieties of H. (H.) obtusum than in any of the forms described above; the 



