PLATE 69. 
Page 
1. Euomphalus sinuatus. 340 
1 a. The lower side of an imperfect specimen, where the umbilicus is filled with stony matter. 
1 b. The upper side of a larger specimen, the apex of which is imperfect. 
2. Oncoceras ovoides. 342 
2 a. A longitudinal section of the specimen, showing the crowded septa near the outer chamber. 
2 b. The exterior of the cast of the same specimen. 
3 a - d- Cyrtoceras subrectum. 342 
3 a. A cast preserving a part of the outer chamber and about twenty septa. The back is 
somewhat worn, so that the form of the siphuncle is seen. 
3 b. Lateral view of a fragment of a larger individual, showing the cast of the interior of the 
siphuncle. 
3 c. A smaller individual, lateral view. The apparent rapid attenuation above is due to com¬ 
pression of the lower part of the specimen. 
3 d. A portion of the cast of the siphuncle, with the filling between the adjacent septa. 
