i66 Ciitcitniati Society of Natural History. 



GONIATITES OCCIDENTALIS, n. sp. 



Plate 6, Fig. 6, lateral view, natural size ; Fig. 7, dorsal view, 

 showing end of siphtincle at the upper margin and two spots 

 where it is brokeji into on the dorsum, a radiating furrow and 

 the outlines of t'wo septa crossing the dorsum. 



Shell below medium size, globose, broadly rounded on the 

 dorsum, or rather semi-circular from the margin of the um- 

 bilicus on one side to the margin of the umbilicus on the 

 other. Umbilicus large, abrupt, deep, exposing very little of 

 the inner whorls. Volutions very gradually enlarging, the 

 outer ones profoundly grooved for the reception of the inner 

 ones; transverse diameter one half greater than the dorso- 

 ventral diameter. Four broad, shallow, indistinctly defined 

 furrows radiate from the uni])ilicus and pass straight across 

 the dorsum. Surface between the furrows marked with fine 

 transverse lines, and having the border of the umbilicus 

 crenated or subnodose. Siphuncle small and close to the shell 

 on the outer margin. Body chamber and aperture unknown. 



vSepta form a sigmoidal flexure in crossing the dorsum, with 

 a single angular lateral lobe. 



The general form, surface markings, including the radiating 

 furrows, and sigmoidal flexure of the septa on the dorsum, 

 will distinguish this from all other species. 



Found in the Coal Measures, on Elkhorn Creek, Kentucky, 

 and now in the collection of Charles Faber. 



GONIATITKS I.IMATUS, U. sp. 



Plate 6, Fig. 8, lateral viezo, natural size ; Fig. g, dorsal view, 

 the fracture at the end destroys the saddles and lodes, leaving 

 only the three inferior indentations. 



Shell small, elegant, thin, discoidal, rapidly expanding in 

 circumference, with very slight increase in thickness ; sides 

 flat and dorsum narrowly rounded. Umbilicus small, abrupt, 

 exposing very little of the inner whorls. Volutions rapidly 

 expanding dorso-ventralh' with very little increase trans- 

 versely ; the outer ones fully embracing the inner ones, flat- 

 tened on the sides from the umbilicus to the middle of the 

 superior lateral saddles, from which a flat depression extends 



