PLATE 69. 



Page 

 Fig. 1. EUOMPHALUS SINUATUS. 340 



1 a. Tlie lower side of an imperfect specimen, wliere the umbilicus is filled with stony matter. 

 1 b. The upper side of a larger specimen, the apex of which is imperfect. 



Fig. 2. Oncoceras ovoides. 342 



2 o. 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. 



Fig. Z a- d. Cyrtoceras subrectum. 342 



3 o. A cast preserving a pait of the outer chamber and about twenty septa. The back is 

 somewhat worn, so that the form of the siphuncle is seen. 



3 6. 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 a^acent septa. 



