PLATE X. 



PAGE 



Figs. 1-3. Diastylis mystacina, n. sp., . . .60 



Fig. 1. Adult female, viewed from the left side ; magnified about fifteen diameters. 

 Fig. 2. Same, seen from above. 

 Fig. 3. Extremity of tail, together with telson and uropoda, seen from above. 



Figs. 4-5. Nannastacus suhmi, n. sp.., . . .63 



Fig. 4. Adult female, viewed from the right side ; magnified about fifty diameters. 

 Fig. 5. Adult male, seen from the right side ; equally enlarged. 



Fig. 6. Camj^ylas2ns pacifica, n. sp., . . . 66 



Fig. 6. Adult female, seen from the left side; magnified about forty- three diameters. 



