Fig. 15. A collection of individuals from a culture in which the small race k 

 and the large race L2 have been living together for five months (October 8, 1908 

 to March 9, 1909), showing that the two races are still distinct. The upper row 

 (a to e) shows individuals belonging to k (aurelia); the lower row (/to j) individ- 

 uals of L2 (caudatum). (The specimen marked j is a starved individual of L2). 

 Note the difference in the form of the posterior part of the body in the two races. 

 Edinger drawing apparatus. X 375. 



Journal of Morphologt, Vol. 21, No. 4. 



