206 Illinois State Laboratory of Natural History 



Plate XXYIII. 



Fig. 1. Diaptomus reighardi, fifth feet of male. X 400. 

 Fig. 2. Diaptomus stagnalis, right antenna of male. X 80. 



Plate XXIX.* 



Fig. 1. Diaptomus oregonensis, fifth feet of male. X 240. 



Fig. 2. Fifth foot of female of same. X 300. 



Fig. 3. Diaptomus signicauda, fifth feet of male. X 200. 



Fig. 4. Terminal segments of right antenna of male of same. X 200. 



Fig. 5. Fifth foot of female of same. X 200. 



Fig. 6. Last thoracic segment and abdomen of female of same. X 100. 



Plate XXX.* 



Fig. 1. Diaptomus franciscanus, last thoracic segment and abdomen 



of female. X 40. 



Fig. 2, Terminal segments of right antenna of male of same. X 200. 



Fig. 3. Fifth pair of feet of male of same. X 200. 



Fig. 4. Fifth foot of female of same. X 200. 



Fig. 5. Diaptomus minut'us, fifth foot of female. X 300. 



Fig. 6. Fifth foot of male of same. X 300. 



Fig. 7. Terminal segments of right antenna of male of same. X 300. 



Fig. 8. Last thoracic segment and abdomen of female of same. X 250. 



Plate XXXI. 



Fi<;. 1.* Diaptomus trybomi, terminal segments of right male antenna. 



X160. 

 Fig. 2.* Last thoracic segment and abdomen of female of same, seen 



from right side. X 96. 

 Fie. 3. The same, seen from above. X 140. 

 Fig. 4.* Fifth pair of feet of male of same. X 210. 

 Fig. 5.* Fifth foot of female of same. X 240. 



Plate XXXII. 



Fig. 1. Diaptomus ashlandi, fifth pair of feet of female (a variant). 



X210. 

 Fig. 2. Fifth foot of female of same. X 240. 

 Fig. 3. Fifth pair of feet of male of same. X 240. 

 Fi<;.4. Anterior fifteen segments of right antenna of male of same. 



X240. 



*After de Uuerne and Richard, '89b. 



