DESCRIPTION OF PLATE VIII. 



Orthoceras albersi S. A. Miller 140 



Fig. 1, lateral view, showing part of the shell with its longi- 

 tudinal furrows; Fig. 2, part of another specimen with the 

 outer shell removed; Fig. 3, a single chamber, showing the 

 convexity of the septa; Fig. 4, an end view, showing the 

 eccentric position of the siphuncle. 



Sphenolium cuneiforme S. A. Miller, 141 



Fig. 5, part of the right valve of the shell ; Fig. 6, the beak 

 and part of the hinge line, showing the ligamental furrow. 



Orthodesma cymbula n. sp. 143 



Fig. 7, right valve of a nearly complete cast; Fig. 8, left valve 

 of another specimen; Fig. 9, cardinal view of the same, 

 the posterior end is broken, but there is no evidence that 

 the shell was gaping. 



Orthodesma scaphula n. sp., 145 



Fig 10, view of the right valve; Fig. 11, cardinal view of the 

 same specimen. 



Orthodesma ashmani n. sp., 146 



Fig. 12, right valve ; Fig. 13, left valve; Fig. 14, left valve of a 

 smaller specimen. 



Technophorus cineinnatiensis n. sp., 147 



Fig. 15, left valve, magnified four diameters; Fig. 16, same, 

 natural size. 



Crania albersi n. sp , 154 



Fig. 17, magnified three and a half diameters; Fig. 18, mag- 

 nified one and three-fourths diameters; Fig. 19, lateral 

 view, magnified three and one-fourth diameters. 



Hyolithes versaillesensis n. sp., 155 



Fig. 20, magnified four diameters; Fig. 21, transverse section 

 and convex side of a fragment magnified four diameters; 

 Fig. 22, flattened side of same magnified four diameters. 



Hyolithes (?) dubius n. sp., 155 



Fig. 23, transverse section and side view, magnified in length 

 four diameters and in width three diameters. 



Agelacrinus faberi S. A. Miller, 156 



Fig. 24, natural size; Fig. 25, magnified two diameters. 



Beyrichia hammelli n. sp., 157 



Fig. 26, right valve magnified twelve diameters, with a small 

 piece of the border broken away at the antero-dorsal angle. 



