PLATE LVI 



PAGE 



Figs. 1, 2. CALYMENE GRANULOSA Foerste 356 



1. An entire, extended specimen. 



2. Portion of same showing granulose surface. X 4. 



Ordovician (Cincinnatian), Eden shale, Cincinnati, Ohio. 



FIGS. 3, 4. ISOTELUS STEGOPS Green 342 



3. A complete although somewhat imperfect example. 



4. The spinose form of the species. 



Ordovician (Cincinnatian), Eden shale, Cincinnati, Ohio. 



Figs. 5, 6. CBYPTOLITHUS BELLULUS (Ulrich) 333 



5. Cephalon with spines preserved. 



6. The original type representing the young form of the species. X 3. 



Ordovician (Cincinnatian), Eden shale, Covington, Kentucky. 



Figs. 7-13. TRIARTHUS BECKI Green 342 



7-11. Specimens in various stages of growth. 



12, 13. Drawings of Beecher's celebrated restorations showing the 

 appendages in position. 



Ordovician (Cincinnatian), Utica shale, New York. 



Figs. 14-17. CRYPTOLITHUS RECURVUS (Ulrich) n. sp 334 



14, 15. Two imperfect but almost entire specimens. 



Ordovician (Cincinnatian), Eden shale, Covington, Kentucky. 



16. Cephalon showing convexity. 



17. Pygidium. 



Ordovician (Mohawkian), Trenton Is., Covington, Kentucky. 



Fig. 18. CORNULITES FLEXUOSUS Hall 276 



A group of tubes adhering to a brachiopod shell. 



Ordovician (Cincinnatian), Maysville group, Cincinnati, Ohio. 



406 



