PLATE XVI. 



PAGE. 



Fig. 1. Sangcjinolites? ^olus 307 



la. Right side view of an internal cast. 



1&. Dorsal ■view of same. 



Ic. E-ight side view of anotlier specimen. 



Fig. 2. Sanguinolites ? obliquus * 306 



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



away. 



2&. A riglit side view of a larger specimen. 



Fig. 3. Allorisma Winchelh 311 



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



3&. 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. 



•ib. A dorsal view of same . 



Fig. 5. GrRAMMYsiA? Hannibalensis 300 



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



5b. Dorsal view of same. 



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



Fig. 6. Geammysia ventricosa 303 



6a. A left side view of a cast of the exterior. 



6b. Dorsal side of same. 



Fig. 7. Orammysia? rromboides 302 



7a, A right side view of a oast. 



7?;. Dorsal view of samo. 



