NO. 9 NEW CAMBRIAN TRILOBITE FAUNULE — RASETTI 49 



Page 



Fig. 4. Stigmadiscus gibbosus Rasetti, new species 37 



Dorsal and lateral views of cephalon, XS. 

 Fig. 5. Stigmadiscus stenotnetopiis Rasetti, new genus, new species . . 36 



Dorsal and lateral views of cephalon, X3. 



Plate 4 



Figs. 1-14. Acimetopus bilobatus Rasetti, new genus, new species ... 14 

 1-4, Dorsal, oblique, anterior, and lateral views of cephalon, X5; 

 U.S.N.M. 145991, holotype. 5, Cephalon, X6. 6, Cephalon, X4. 

 7, Cephalon, XS. 8-10, Dorsal, lateral, and posterior views of py- 

 gidium, X5. 11-13, Dorsal, lateral, and posterior views of pygidium, 

 X5. 14, Lateral view of pygidium preserving part of axial spine, X5. 

 U.S.N.M. 145992, paratypes. 



Plate 5 



Figs. 1-6. Bolboparia superba Rasetti, new genus, new species .... 19 

 1-4, Dorsal, anterodorsal, frontal, and oblique views of cephalon, X4; 

 U.S.N.M. 145998, holotype. 5, Thoracic segment, X5. 6, Cephalon 

 with broken-off glabellar spine, showing occipital ring, X5. U.S.N.M. 

 145999, paratypes. 



Figs. 7-12. Bolboparia elongata Rasetti, new species 20 



7-9, Lateral, dorsal, and frontal views of cephalon, X5 ; U.S.N.M. 

 146001, holotype. 10, Cephalon, X5. 11, 12, Lateral and dorsal views 

 of pygidium, X4. 13, Pygidium, X7.5. U.S.N.M. 146002, paratypes. 



Figs. 13, 14. Bolboparia canadensis Rasetti, new species 21 



13, 14, Dorsal and lateral views of cephalon, X8. G.S.C. 19887, holo- 

 type. Collected from the Charny formation near Elgin Station, 

 L'IsIet County, Quebec. 



Plate 6 



Figs. 1-10. Analox bipunctata Rasetti, new genus, new species .... IS 

 1-3, Dorsal, frontal, and lateral views of cephalon, X6; U.S.N.M. 

 145993, holotype. 4, Cephalon, X6. 5, 6, Lateral and dorsal views 

 of pygidium, XlO. 7, 8, Lateral views of two cephala, X6. 9, py- 

 gidium, X5. 10, Pygidium, X6. U.S.N.M. 145994, paratypes. 



Figs. 11-19. Acidiscus birdi Rasetti, new genus, new species 11 



11, 12, Dorsal and lateral views of cephalon, X2; U.S.N.M. 145987, 

 holotype. 13-15, Dorsal, lateral, and frontal views of cephalon, X2. 

 16, 17, Dorsal and lateral views of pygidium, X2. 18, Lateral view 

 of pygidial doublure showing short spines, X5. 19, Portion of py- 

 gidium showing granulate surface, X7.5. U.S.N.M. 145988, para- 

 types. 



Figs. 20, 21. Undetermined pygidium No. 4 46 



20, 21, Two examples, X2.5 ; U.S.N.M. 146000. 



