176 Trans. Acad. Sci. of St. Louis. 
EXPLANATIONS OF ILLUSTRATIONS. 
....Plate XXX VI.—Fig. 1. Diaptomus augustaensis, male, distal portion 
of the geniculated 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. 
