PLATE LVI. 



GtROCERAS TRANSVERS0M. 



Pago 384. 



Fig. 1. Latei-al view of a large fragment, showing the curvature and enlargement of the tube, and the 



rows of rounded nodes over the chambered portion. The strong test is shown covering the 



doi-sal side of the tube. The arching, transverse sti'iae, represented on the chamber of hal>ita- 



tion, do not exist on the specimen. Qoniatite limestone of the Mai-cellus shale. Near ilan- 



lUis, N. r. 

 Fig. 2. Ventral view of the preceding, showing the sinus in the margin of the aperture, the crenulated 



zone at the base of the grand chamber, and the profile of the nodes on the si<le8 of the tube. 

 Fig. 3. Ventral view of a smaller septate fragment, showing the variation in the depth of the air-chanit)ei-8 



towai-d the apex, and a longitudinal, flattened band along the ventrnm. Goniatite limestone. 



Near Manlius, N. T. 

 Fig. 4. A septum of the preceding, showing the size and position of the siphuncle on the convex ventral 



side of the tube. 



Nautilus liratus, vai. jdvenis. 

 Page 111. 

 Fig. 5. The doi-sal side of the specimen, preserving the grand chamber and several imperfect air-chambers, 

 showing the broad elliptical aperture, and the slender, carinate levolving striae, with fine trans- 

 verse strisB. The position of the siphuncle cannot be satisfactorily determined, and is not 

 represented. Hamilton shales. Cazenovia, N. Y. 

 Fig. 6. The ventral side of the game specimen, showing the revolving strise much subdned, while the trans- 

 verse strise are essentially the same as on the opposite side. The specimen is free from 

 weathering or wearing, and the sui-face-markings are in their natural condition. 



