PLATE LIY. 
Nautilus (Discites) Marcellensis. 
Page 428.;; 
See Plate 109. 
Fig. 1. A lateral view of an internal cast of a large individual of the species, showing the air-chambers, the 
anterior extension of the septa on the peripheral angles, and some irregularity in the distribu¬ 
tion of the nodes. The grand chamber is nearly entire. 
Fig. 2. A cast of the interior preserving the grand chamber neai’ly entire, with a single volution of the sep¬ 
tate portion of th© shell. The chambers of the inner volution are slightly deeper than in the 
preceding specimen, and the chamber of habitation is more rapidly expanding. The nodes 
on the peripheral angles are not so strong as in the specimen fig. 1. Both specimens are from 
the Goniatite limestone of the Marcellus shale. Near Manlius , N. Y. 
