Xll 
LIST OP PLATES. 
PLATE XVII. 
1. Cythere albo-maculata. 2. Cypridina Macandrei : a, shell; 
b, animal. 3. Cyclops qnadricornis : a, male ; b, female ; c, d, 
larvae. 4. Diaptomus Castor. 
PLATE XVIII. 
1. Anomalocera Patersonii. 2. Cetochilus septentrionalis. 
3. Xotadelphys Ascidicola. 4. Peltidium purpureum. 
PLATE XIX. 
1. Argulus foliaceus. 2. Lepeophtlieirus Stromii : a , male ; 
b , female. 3. Pandarus bicolor. 4. Laemargus muricatns. 5. 
Antliosoma Smitbii. 
PLATE XX. 
1. Xicothoe Astaci: a, b , larvae. 2. Lerneopoda elongata. 
3. Lerneonema Sprattae : a, three specimens attached to a 
Sprat. 4. Lernea branchialis. 
