PLATE IX. 
Figs. 1-lc. PUSTULA SUBLINEATA n. sp p. 168 
1, la, lb, Ic. Pedicle, cardinal, lateral, and brachial views of the 
holotype. Brentwood limestone, Station 152. 
Figs. 2-3a. ORTHOTETES ROBUSTA (Hall) p. 146 
2, A typical brachial valve. Hale formation. Station 149. 
3, 3a. Pedicle and cardinal views of a typical pedicle valve. Brent- 
wood limestone. Station 153. 
Figs. 4-5b. PRODUCTUS GALLATINENSIS Girty p. 163 
4, 4a, 4b. Cardinal, lateral, and pedicle views of a nearly complete 
pedicle valve. 5, 5a, 5b. Cardinal, lateral, and pedicle views 
of a smaller pedicle valve. Morrow formation. Station 304. 
Figs. 6, 7. PUSTULA NEBRASKENSIS (Owen) p. 169 
6. An incomplete pedicle valve of the average size. Kessler lime- 
stone, Station 144. 
7. A smaller pedicle valve, also incomplete. Morrow formation, 
Station 304. 
Fig. 8:. ORTHOTETES ? sp p. 147 
8. A typical brachial valve. Brentwood limestone. Station 135. 
Figs. 9, 9a. PUSTULA PERTENUIS (Meek) p. 165 
9. 9a. Pedicle and cardinal views of a nearly complete pedicle valve. 
Morrow formation. Station 304. 
Figs. 10-lla. PRODUCTUS WELLERI n. sp p. 155 
10, 10a, 10b. Cardinal, anterior, and lateral views of the holotype, 
a pedicle valve. 11, 11a. Interior and lateral views of an asso- 
ciated brachial valve, the allotype. Hale formation. Station 136. 
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