•2-A-? 



New Species of Fussih from Ohio. 



The shell resembles somewhat N. spectahilis, M. and W., but 

 has a smaller number of coils in a shell of corresponding size, 

 while the concavity of the umbilical slope and the sub-angukr 

 back are strong distinguishing features. 



Formation and Locality. — In the Coal-measnres at Springfield, 

 Summit C!o., Ohio. Cabinet of the School of Mines, N. Y. City. 



Klautilu§ (Gyroceras?) subqiiadrangularis, u. sp. 



Pal. O., Ill, Plate 11, Fig. 16. 



Shell of about a medium size, consisting of two volutions, as seen on the 

 specimen used, which increase somewhat rapidly in size with increased 

 length, and are closely coiled so as to bring them in close contact, but not 

 to be in any degree embracing. The inner volution, however, is coiled in 

 so large a circle that it leaves an opening within it of about one inch in di- 

 ameter. The shell is at first circular in section, but before the completion 

 of the first coil the form has become modified so as to produce a sub-quad- 

 rangular section, narrowest on the dorsal side, and the second volution be- 

 comes distinctly quadrangular, being nearly as wide on the dorsum as across 

 the lateral face; but the angles are all distinctly rounded, and the inner or 

 umbilical margins most particularly so. The inner part of the shell has a 

 line of strong node-like undulations on each dorsal angle, which become 

 obsolete at about the first third of the second volution. Margin of the aper- 

 ture greatly extended on the sides beyond the line of the inner edge, and 

 apparently sinuate on the back. Septa deeply concave and numerous; 

 those at the base of the outer chamber showing aboCit three chambers in 

 the space of one inch, and gradually decreasing in distance toward the 

 earlier part of the shell. On the quadrangular parts, they are deeply 

 receding on the sides and back, and correspondingly advanced on the an- 

 gles ; a consequence of the quadrangular form on a deeply concave septum. 

 Surface of the shell apparently smooth and the substance thin. Siphon 

 unknown. 



The species is peculiar in its quadrangular form, and in the 

 wide opening through the centre; in tliese characters it differs 

 from any previously described species. It is of a form that is 

 with difficulty placed in the genus Nautilus, — its characters, so 

 far as the external features are concerned, nearly resembling 

 those of Gyroceras, — and in the absence of a knowledge of the 

 position of the siphuncle, must remain doubtful. 



Formation and Locality. — In limestone of the Coal-measures, 

 at Canfield, Ohio. Collected by H. C. Bowman, and now in 

 the cabinet of the School of Mines, New York City. 



