163 



Phragmoceras Hector. (N. sp.) 



Fig. 147. 



Fig. 147. — Phragmoceras Hector, a, side view of the specimen ; b, view of the 

 cast of the interior. 



Description. — Chamber of habitation large, sub-bemispberical but lat- 

 erally compressed so that at the last septum the dorso-ventral diameter is 

 20 lines to a lateral diameter of 15 lines. The first 2| inches of the ven- 

 tral contour is curved to a radius of about 18 lines. The chamber of habi- 

 tation is 14 lines in depth. The septa are about 3 lines distant on the 

 ventral, and 1| lines on the dorsal aspect. In the cast of the interior 

 the ventral lobe of the aperture leaves a large ovate protuberance about 

 6 lines across. The dorsal lobe is about 7 fines in length and 2| lines in 

 width, and extends quite to the dorsal margin. 



Locality and Formation. — New Hope. In the Guelph formation; 

 Middle Silurian. 



Collector. — E. Billings. 



AscocERAS Newberryi. (N. sp.) 



Description. — Shell small, ovate, apex narrowly roimded ; contracted 

 towards the aperture ; greatest diameter a little above the middle of the 

 septate portion, at which point the lateral diameter is greater than the 

 dorso-ventral in the proportion of 10 to 8. There are, apparently, three 

 septa. The first of these crosses the back of the shell about two lines 

 above the apex ; then traverses the side, proceeding obUquely upwards at 

 an angle of about 45° to the longitudinal axis, and crosses the ventral 



