NO. 9 NEW CAMBRIAN TRILOBITE FAUNULE — RASETTI 51 



Page 



Figs. 22, 23. Calodiscus occipitalis Rasetti, new species 24 



22, 23, Lateral and dorsal views of cephalon, X5; U.S.N.M. 146003, 

 holotype. 



Plate 10 



Figs. 1-10. Oodiscus subgranulatus Rasetti, new genus, new species . . 29 

 1-3, Dorsal, frontal, and lateral views of cephalon, XS; U.S.N.M. 



146014, holotype. 4, Portion of the same cephalon, showing one of 

 the marginal spines and ornamentation, X7.5. 5, Cephalon, X4. 



6, portion of cephalon, showing positions of the marginal spines, XS. 



7, Portion of pygidium showing ornamentation, X7.5, 8, Pygidium, 

 X3. 9, 10, Dorsal and lateral views of pygidium, X3. U.S.N.M. 



146015, paratypes. 



Fig. 11. Undetermined pygidium No. 3 39 



Dorsal view of specimen, X3. U.S.N.M. No. 146035. 



Figs. 12-15. Serrodiscus latus Rasetti, new species 34 



12-14, Lateral, dorsal, and frontal views of cephalon, X6; U.S.N.M. 

 146024, holotype. 15, Larger cephalon, X4; U.S.N.M. 146025, 

 paratype. 



Figs. 16-18. Oodiscus binodosus Rasetti, new species 30 



16-18, Dorsal, frontal, and lateral views of cephalon, X5; U.S.N.M. 



146016, holotype. 



Fig. 19. Serrodiscus, species undetermined 35 



Dorsal view of cephalon, X5 ; U.S.N.M. 146028. 

 Figs. 20, 21. Oodiscus longifrons Rasetti, new species 30 



20, Cephalon, X3; U.S.N.M. 146019, paratype. 21, cephalon, X4; 

 U.S.N.M. 146018, holotype. 



Plate 11 



Figs. 1-7. Leptochilodiscus punctulatus Rasetti, new genus, new species . 26 

 1-3, Dorsal, lateral, and frontal views of cephalon, X7.5; U.S.N.M. 

 146009, holotype, 4, 5, Dorsal and oblique views of another cephalon, 

 X7.5; U.S.N.M. 146011, paratype. 6, 7, Dorsal and frontal views of 

 incomplete cephalon, X7.5 ; U.S.N.M. 146010, paratype. 



Figs. 8-11. Oodiscus, species undetermined No. 1 31 



8-10, Dorsal, lateral, and posterior views of pygidium, X3. 11, Py- 

 gidium, X4. U.S.N.M. 146020. 



Figs. 12, 13. Oodiscus, species undetermined No. 2 31 



12, 13, Pygidia, X4. U.S.N.M. 146021. 



Figs. 14-16. Undetermined pygidium No. 2 38 



14, 15, Dorsal and lateral views of specimen, X5. 16, Smaller speci- 

 men, X7.5. U.S.N.M. 146034. 



Figs. 17-21. Undetermined pygidium No. 3 38 



17, 18, Lateral and dorsal views of small specimen, X7.5. 19-21, 

 Posterior, lateral, and dorsal views of larger specimen, X5. U.S.N.M. 

 146033. 



Fig. 22. Bonnia, species undetermined No. 2 44 



Cranidium, XS. U.S.N.M. 146041. 



