University of Michigan 



PLATE I. 



Figure i. Recently hatched individual, showing relative size and form 



of gill membrane rudiments. Enlarged 2.^^ times. 

 Figure 2. Embryo removed from egg membrane ; right gill membrane 



slightly raised, left gill membrane in position. Enlarged about 4.5 



times. 

 Figure 3. Emfcryo just previous to the time of hatching, showing the 



relative size of the gill membranes. Enlarged about 5 times. 

 Figure 4. Photograph of living female bearing eggs. Reduced about 



4/4 times. 

 Figure 5. Photograph of living female with young emerging from the 



eggs. About y^ natural size. 

 Figure 6. Cavity in which one of the females was found. 

 Figure ". Photograph of living female bearing eggs. Reduced about 



J. 7 times. 



