PLATE XXXI 



PAGE 



Fig. 1. PAL.EOPHYCUS TUBULARE Hall 192 



View of the cylindrical stems of this species, two-thirds natural size. 

 Ordovician (Canadian), Tribes Hill Is. of New York. 



Figs. 2-5. OPHILETA COMPLANATA Vanuxem 302 



2, 3. Top and side views of the type of Pleurotomaria hunterensis 

 Cleland, representing a large specimen of Ophileta complanata. 

 4, 5. Lower and upper views of a smaller specimen. 



Ordovician (Canadian), Tribes Hill Is., Fort Hunter, New 

 York. 



Fig. 6. PLEUBOTOMARIA FLOBIDENSIS Cleland 291 



Enlarged view of the type example. 



Ordovician (Canadian), Tribes Hill Is., Fort Hunter, New 

 York. 



Figs. 7-12. DALMANELLA WEMPLEI Cleland 246 



7. A large brachial valve. X 2. 



8, 9. Two pedicle valves with side outline of one. X 2. 



Ordovician (Canadian), Kittatinny Is., Columbia, New Jersey. 

 10. Brachial valve. 



11, 12. Two pedicle valves, showing alternation of coarse and fine 

 costae. 



Ordovician (Canadian), Tribes Hill Is., Fort Hunter, New 

 York. 



Figs. 13, 14. RIBEIBIA NUCULITIFOBMIS Cleland 362 



13. Lateral view of well preserved cast showing the notch. 



14. Posterior view of a cast. 



Ordovician (Canadian), Tribes Hill Is., Fort Hunter, New 

 York. 



Figs. 15-17. RAPHISTOMA ? OBTUSUM Cleland 307 



Upper, side, and lower views of the type, enlarged. 



Ordovician (Canadian), Tribes Hill Is., Fort Hunter, New 

 York. 



Figs. 18, 19. OPHILETA LEVATA Vanuxem 304 



Top and side views of the type of Ophileta discus Cleland determined 

 by that author to be the same as Ophileta levata. 



Ordovician (Canadian), Tribes Hill Is., Fort Hunter, New 

 York. 



Figs. 20, 21. ECCLIOMPHALUS MULTISEPTABIUS Cleland 305 



20. Top view of the type. 



21. Natural section showing the partitions. 



Ordovician (Canadian), Tribes Hill Is., Fort Hunter, New 

 York. 



Figs. 22, 23. RAPHISTOMA COLUMBIANUM Weller 307 



Top view and side outline of the type example. 



Ordovician (Canadian), Kittantinny Is., Columbia, New 

 Jersey. 



Fig. 1 after Hall, 2-6, 10-21 after Cleland, and 7-9, 22-23 after 

 Weller. 



381 



