4G2 
PALAEONTOLOGY OF NEW YORE. 
The largest specimens have a diameter of more than 100 mm., and the 
smallest specimen identified with this species has a diameter of about fifty- 
five mm. 
The Goniatites sinuosus, as originally illustrated in the Geolog. Surv. of N. Y.: 
Rep. of Fourth Fist., included two very distinct species. In order to rectify this 
error, I published, in 1874, a description of G. Nundaia, recognizing the species 
as being in part those forms which had before been included under G. sinuosus. 
By this rectification it was intended to leave the form figured on page 245 of 
the Geological Report as the representative of G. sinuosus. The condition of 
preservation of the original specimen is such as to preclude a critical examina¬ 
tion of the septa and other important characters, while its form and external 
aspect are so nearly similar to G. discoideus that I am induced to unite the two 
as one species. The appearance of an umbilicus in the original figure is due to 
some adhering stone upon that part of the shell. 
The specimen, figure 11 of plate 72 is one of those originally referred to 
G. sinuosus. It is a part of the chamber of habitation from its commencement, 
and the characters of the last septum cannot be fully determined, owing to the 
imperfect condition of the margins. Unlike the specimen just mentioned, it 
possesses a wide umbilicus; and in the proportions of the outer chamber and 
the position of the summit of the saddle, relatively to the dorsal and ventral 
margins, it has the character of those forms referred to G. Nundaia, and these 
must therefore be referred to the same species; and since G. sinuosus has the 
priority, the forms previously recognized as G. Nundaia will be included under 
the original designation. It is to be remarked, however, that one of the 
original specimens of G. sinuosus possesses some differences which are quite 
marked, but which are apparently not of specific importance. A comparison 
of fig. 11, pi. 72, with figs. 13-15, of pi. 70, will show that the fragment illus¬ 
trated on pi. 72 has a projjortionally smaller umbilicus, and more rapidly 
enlarging tube. 
This species, in its various conditions of preservation, has much general 
resemblance to G. complanatus, var. perlatus, but the volutions are less deeply 
embracing, the septal lobes and saddles are conspicuously different, and the 
