1058 Wisconsin Academy of Sciences, Arts, and Letters. 
EXPLANATION OF PLATE LXVII. 
1. Pseudosicla bidentata. Enlarged 35 diameters. From drawing 
by Mr. E. Foster of New Orleans. 
2. Pseudosida bidentata. Antennule. Enlarged 75 diameters. 
3. Pseudosida bidentata. Apex of abdomen and base of claw. En¬ 
larged 500 diameters. 
4. Pseudosida bidentata. Old female with head in natural position. 
Enlarged 25 diameters. 
5. Pseudosida bidentata. Post-abdomen of male. Enlarged 100 
diameters. 
6. Pseudosida bidentata. Post-abdomen of female. Enlarged 75 
diameters. Anal spines enlarged 500 diameters. 
7, 8. Pseudosida bidentata. Clasper from first foot of male. Enlarged 
500 diameters. 
9. Pseudosida bidentata. Antennule of male. Enlarged 100 di¬ 
ameters. 
