1888.] 485 [Newell. 



place is 8 mm. The narrower end of the oval is on the ventral or 

 convex side. Horizontal sections, taken in succession below the 

 centre, become more and more nearly circular as they are taken 

 lower down until, at the place where the septa cross the ventral 

 side, the section is circular. Below this place the section becomes 

 slightly elliptical, the greatest diameter being lateral or at right 

 angles to the greatest diameter above. The extreme tip bearing 

 the mark of the pseudo-siphon turns slightly towards the ventral 

 side. 



The living chamber occupies about one-half of the broken shell. 

 On the portion just above the upper limit of the sutures, the living 

 chamber appears to be very slightly constricted, forming a neck, 

 which enlarges again slightly toward the aperture. 



Of the closed chambers, the upper one, that adjacent to the liv- 

 ing chamber, is the narrowest. On the ventral view the four sut- 

 ures are seen crossing the figure at a point 3 to 5 mm. above the 

 extreme point. The first suture curves slightly downward form- 

 ing a shallow lobe, the second runs nearly horizontal, while the 

 third and fourth curve upward forming slight ventral saddles. On 

 this view the sutures are less than one millimeter apart. Looking 

 at the specimen from the side, the sutures are seen to curve back- 

 ward and upward approaching each other, then run nearly to- 

 gether, sweeping in a gentle curve up and forward toward the 

 ventral side, then separately turn off towards the back, crossing 

 the back. On the dorsal view the lowest suture shows a very slight 

 inflection or dorsal lobe, while the second suture crossing 4^- mm. 

 above is nearly straight. The third suture is 3^- mm. above the 

 second and the fourth 2 mm. above the third, each having a broad, 

 low, dorsal saddle. The greatest length of the lowest enclosure 

 is 18mm. 



On the extreme tip are a small dot and circular cicatrix about 

 l^rnm. in diameter. 



Locality. — Limestones at Delphi, Indiana. 



In addition to the above described fossils the following species 

 have been identified : 

 Lituites Bickmoreanus Whitfield, Bull. Am. Mus. Nat. Hist., i, 



No. 6 (a very common form at Wabash, Ind.). 

 Lituites Graftonensis Meek and Worthen, Geol. 111., vi, p. 507, 



pi. 25, fig. 1 (from Wabash, Ind.). 



