Plate XII. 
Fig. 1. Bolla pumulaym Sp. <. (.2.0 Geen eR oo =! 117 
Ia and 14, side and end views of a valve of this species, x 20 ; from 
near Weisburg, Ind. 
Fig. 2... Primitia ‘milleri; n. sp... 2. Se 133 
2a, left valve, x 2c, from near Weisburg, Ind. The entire sur- 
face is beautifully punctate as shown at a small spot. 
26 and 2c, ventral and anterior views of same. 
Fig. 3. Entomis waldronensis, n. sp...) 7) 3 
3a and 34, side and dorsal views of a right valve, natural size. 
Fig. 4. Octonaria curta,.n. sp... 22. 195, 
4a and 44, side and ventral views of a valve of this species, x 20, 
from Lockport, N. Y. 
lig. 5. .Ctenobolbina: punctata;, n> sp. .2 9 oe 136 
5a, 56 and 5¢, three views of a right valve, x 20, from Lockport, 
INGE 
hig. 6 /Beyrichia tricollina. esp. 0-5 ae Se 189 
A right valve, x 20, with the frill broken away at the anterior end ; 
from 18 mile creek, N. Y. 
Fig. 7. Atchmina-abnormis; n. Spo 23.055 26 183 
7a and 74, side and anterior views of a right valve, x 20, from Lock- 
POLE Ne 
Fig. 8. Primitia granimarginata, ND. sp. =. 5.) =e 201 
8a, left valve, x 28, from near Grayson Springs, Ky. The small 
granules at the margin are not well shown in the figure. 
84, another valve, in outline, x 28, differing slightly in shape. 
Fig. 9. Moorea granosa, n: sp 2... >... 2. ee 206 
ga and 94, side and ventral views, x 28, of a right valve. 
Fig. 10... Ulrichia emarginata, 1. sp. :... 4:5) 203 
10a, 100 and loc, three views of an entire carapace, x 28. 
Fig. 11. Ulrichia confluens, n/ spy... .: 2 2. =n 203 
IIa and 114, side and dorsal views of a left valve, x 20. 
Fig. 12. Bolla granifeta, n. sp... 9... - er 205 
12a and 12é, side and posterior views of a right valve, x 20. 
