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PLATE 11. 



Fig. 1. 78. 8. Orthoceras mot-ticameratum. (Pig- 45.) 



1. A fragment twelve inches long, showing a large part of the deep outer chamber, which is partially filled 

 with fragments of the Phylopri* ( See Plate 9). 



1 a. Another fragment, showing the continuation of the fossil to the apex. These two were not found in con- 

 nexion, but are apparently fragments of two individuals. 



1 6. A fragment showing some irregularity in the septa. 



1 e. A worn specimen, showing the septa and siphuncle, which is near the margin ( ventral ? ). The siphon, 

 in one place, shows something like an enlargement between the septa as in Ormoceras ; but it is too 

 indistinct to warrant its reference to the latter genus. 



Fig. 1 d. 79. 9. Orthoceras recticameratum. (Pag. 46.) 



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