No. 89.] 



i05 



Geological formation and locality. In the Goniatite limestone; atManlius, N.Y. 



The locality cited by Mr. Sjemann for his species is Cazenovia; but the Gonia- 

 tite limestone does not occur there, and I presume the specimens were from Mr. 

 LiNCKLAEN of Cazenovia, who derived them from the Goniatite limestone at Man- 

 lius. 



GYROCERAS GRACILE (n.s.). 



Shell slender, curving, very gradually enlarging; vertical and transverse diame- 

 ters about as four to five; septa undulated on the back, distant about one-third 

 the greater diameter : on the ventral side there are, in the same measurement, 

 a little more than five septa. Siphuncle excentric, and near the dorsal side. Sur- 

 face longitudinally striated. 



1^^:^^^ 



The specimen is a fragment, and the true form and num- 

 ber of volutions is unknown. The occurrence of a species of 

 this genus in the same association as the GoxiatiteS, etc. 

 is interesting, and therefore it is enumerated in this place. 



1. Dorsal view of fragment. 2. Lateral view of same : s, siphuncle. 



Geological formation and locality. In the same beds with Goniatites rotato- 

 rius and G. oweni : at Rockford, Indiana. 



ONCOCERAS DILATATUM (n.s.). 



Shell very rapidly expanding towards the aperture; outer septa very moderately 

 convex, distant about one-eighth of an inch; section oval, a little wider on the 

 dorsal side of the transverse diameter : vertical and transverse diameters about 

 as 17 to 13. The expansion at the sides, in the length of five septa, is from seven- 

 eighths to one inch and three-eighths; and from the dorsal to the ventral side, 

 • the expansion in the same length is from one inch and one-eighth to one inch 

 and six-eighths, the expansion being mainly on the dorsal side. 

 The specimen is imperfect, and the apex and outer chamber unknown. The gene- 

 ral form, shallow chambers, and other characters, refer it to the Genus Ojstcoceras. 

 The curvature in the body of the shell has been very moderate, as usual with the 

 shells of this genus. 



Geological formation and locality. In the Goniatite limestone; at Schoharie. 



GOMPHOCERAS (APIOCERAS) OVIFORME ( n.s.). 



Shell, in its outer chamber and upper part, rotund, subovate or oviform, abrupt- 

 ly contracted towards the aperture, which is large and well defined; length of 

 the outer chamber but little greater than the greatest width. From the base of 

 the outer chamber to an equal distance below, it has nearly the same size and 

 form, embracing four or five septa; and from this point the tube is very abruptly 

 contracted. Section circular or broadly oval. Surface marked by fine concentric 

 stria3. 

 Fragments of this species are not uncommon, though I have seen but a single 



individual which preserves the entire form. 



Geological formation and locality. In the Goniatite limestone : at Manlius and 



Schoharie. 



[Senate, No. 89.] 14 



