120 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 148 



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Figs. 16-23. Norwoodella walcotti Resser 66 



16-18, Dorsal, lateral, and frontal views of cranidium, x4. 19, 20, Py- 

 gidia, X5. 21, Free cheek, x5 (coll. cne/10) ; U.S.N.M. 144616, 

 plesiotypes. 22, Free cheek, x5 (coll. cne/12) ; U.S.N.M. 144617, 

 plesiotype. 23, Cranidium, x4 (coll. U.S.G.S. 2407) ; U.S.N.M. 

 144618, plesiotype. 



Fig. 24. Norwoodia, sp. undet 65 



Incomplete, exfoliated cranidium, x4 (coll. cnc/4) ; U.S.N.M. 144611. 



Figs. 25, 26. Norwoodia rogersvillensis Resser 64 



25, Exfoliated cranidium, xS. 26, Exfoliated pygidium, XlO (coll. 

 cnd/1) ; U.S.N.M. 144610, plesiotypes. 



Plate 5 



Figs. 1-3. Coenaspis spectabilis Resser 105 



Dorsal, frontal, and dorsolateral views of rubber reproduction of par- 

 tially exfoliated holotype cranidium, x4 (coll. U.S.N.M. 123a) ; 

 U.S.N.M. 94978. 

 Figs. 4-8. Cedaria tennesseensis Walcott 69 



4, 5, Cranidia flattened in shale, x2 (coll. U.S.N.M. 107a) ; U.S.N.M. 

 70273, paratypes. 6, Free cheek, x3. 7, Exfoliated pygidium, x2. 8, 

 Pygidium, x3 (coll. cne/10) ; U.S.N.M. 144623, plesiotypes. 



Figs. 9-11. Genevievella, sp. undet 71 



9, 10, Dorsal and lateral views of cranidium, x3 (coll. cnc/4) ; U.S.- 

 N.M. 144626. 11, Exfoliated cranidium, x5 (coll. cnd/1) ; U.S.N.M. 

 144627. 



Figs. 12, 13. Olenoides, sp. undet 39 



Pygidia, X4 (coll. U.S.G.S. 2406) ; U.S.N.M. 144548. 



Figs. 14-17. Menomonia prominens Resser 62 



14, Exfoliated cranidium, X5. 15, 16, Lateral and posterior views of 

 cranidium, x5. 17, Free cheek, x5 (coll. cnd/1) ; U.S.N.M. 144695, 

 plesiotypes. 



Fig. 18. Cedarina, sp. undet 70 



Exfoliated pygidium, x3 (coll. cnd/1) ; U.S.N.M. 144624. 



Fig. 19. Coosia, sp. undet 53 



Pygidium, x5 (coll. cnn/1) ; U.S.N.M. 144588. 



Fig. 20. Amiaspis erratica Lochman 43 



Cranidium, xlO (coll. cnn/16) ; U.S.N.M. 144558, plesiotype. 



Figs. 21-24. Amiaspis obsolescens Rasetti, n. sp 43 



21-23, Dorsal, lateral, and frontal views of cranidium, x8 (coll. cnmV 

 20) ; U.S.N.M. 144559, holotype. 24, Cranidium, x8 (coll. cnn/16) ; 

 U.S.N.M. 144560, paratype. 



Plate 6 



Figs. 1-4. Tricrepicephalus thoosa (Walcott) 54 



1, Exfoliated cranidium, Xl.5, coll. cnn/3) ; U.S.N.M. 144589, plesio- 

 type. 2, Exfoliated pygidium, x2.2 (coll. cnn/3) ; U.S.N.M. 144589, 

 plesiotype. 3, Cranidium, x2 (coll. cnn/14) ; U.S.N.M. 144590, plesio- 

 type. 4, pygidium preserving unusually smooth test on pleural regions, 

 X2.2 (coll. cnm/2) ; U.S.N.M. 144591, plesiotype. 

 Figs. 5, 6. Crepicephalus buftsi Resser 45 



5, Exfoliated pygidium, xl- 6, Exfoliated pygidium, Xl.5 (coll. cnn/19) ; 

 U.S.N.M. 144565, plesiotypes. 



