176 Trans. Acad. Sci. of St. Louis. 



EXPLANATIONS OP ILLUSTRATIONS. 



..Plate XXXVI. — Fig. 1. Diaptomus augustaensis, male, distal portion 

 of the geniculate*! antenna. — Fig. 2. Diaptomus augustaensis, male, 

 fifth foot. — Fig. 3. Diaptomus augustaensis, female, fifth foot. — Fig. 4. 

 Diaptomus augustaensis, female, posterior end of the abdomen. 



Plate XXXVII.— Daphnia hyalina, female, Stages in its life history — 

 Fig. 1. First stage (from the brood-pouch), — Fig. 2. Second stage (from 

 the brood-pouch).— Fig. 3. Third stage (Free swimming).— Fig. 4. 

 Fourth stage.— Fig. 5. Fifth stage (just before it begins to bear eggs).— 

 Fig. 6. Sixth stage (four egg stage).— Fig. 7. Seventh stage (eight 

 egg stage, two eggs are out of focus).— Fig. 8. Eighth stage (twelve egg 

 stage, four eggs are out of focus). 



Plate XXXVIII. — Fig. 1. Bosmina reversaspina, n. sp., female. — Fig. 

 2. Eurycercus lamellatus, female. 



Issued December 31, 1910. 



