PLATE XVI. 



PAGE. 



Fig. 1. Sanguinolites? .eolus 307 



la. Eight side view of an internal cast. 



16. Dor.sal view of same. 



\c. Right .side view of another specimen. 



Fig. 2. Sanguinolites ? obliquus 306 



2a. A left hand view of an external cast, with a little of the posterior dorsal margin broken 



away. 



26. A riglit side -vdew of a larger specimen. 



Fig. 3. Allorisma Winchelli 311 



3a. A left side view of a variety of this species. 



36. An anterior end view of same. 



3c. A left side view of the typical form. 



Fig. 4. Allorisma ventricosa 312 



4a. A left side view. 



46. A dorsal view of same. 



Fig. 5. Grammysia? Hannibalensis 300 



5a. A left aide view of a mature specimen (cast). 



56. Dorsal view of same. 



5c. A right side view of a smaller example. 



Fig. 6. Grammysia VENTRICOSA 303 



Ca. A left side view of a cast of the exterior. 



66. Dorsal side of same. 



Fig. 7. Grammysia? rhomboides 302 



la. A right side view of a cast. 



76. Dorsal view of same. 



