NO. 3 UPPER CAMBRIAN TRILOBITE FAUNAS — RASETTI 121 



Page 



Fig. 7. Terranovella dorsalis (Hall) 40 



Cranidium, X 10 (coll. cnn/19) ; U.S.N.M. 144549, plesiotype. 



Fig. 8. Undetermined pygidium No. 1 113 



Pygidium, X5 (coll. cnk/1) ; U.S.N.M. 144731. 



Figs. 9-12. Meteoraspis brevispinosa Rasetti, n. sp 55 



9, 10, Lateral and dorsal views of exfoliated pygidium, X2 (coll. cnk/1) ; 

 U.S.N.M. 144594, holotype. 11, Small cranidium, x5. 12, Exfoliated 

 cranidium, x2 (coll. cnk/1) ; U.S.N.M. 144595, paratypes. 



Figs. 13, 14. Meteoraspis mutica Rasetti 54 



13, Cast of impression of cranidium, x3. 14, Exfoliated pygidium, x3 

 (coll. cnm/2) ; U.S.N.M. 144592-3, plesiotypes. 



Figs. 15-18. Coosia alethes (Walcott) 52 



15, Exfoliated cranidium, x2. 16, 17, Exfoliated hypostomes, x2. 18, 

 Pygidium, X3 (coll. cnn/16) ; U.S.N.M. 144582, plesiotypes. (See 

 also pi. 7.) 



Fig. 19. Coosella, sp. undet 50 



Partly exfoliated pygidium, x2 (coll. cnk/1) ; U.S.N.M. 144579. 



Figs. 20, 21. Undetermined pygidium No. 2 113 



20, Pygidium, x5. 21, Exfoliated pygidium, X3 (coll. cnm/2) ; U.S.- 

 N.M. 144732. 



Plate 7 



Figs. 1-5. Coosella planicauda Rasetti, n. sp 49 



1, Cranidium, x3. 2, Cranidium, X5 (coll. cnk/1) ; U.S.N.M. 144576, 

 paratypes. 3, Exfoliated pygidium, x2. 4, Pygidium, X3 (coll. cnm/ 

 2) ; U.S.N.M. 144575, paratype. 5, Pygidium, x4 (coll. cnm/2) ; 

 U.S.N.M. 144574, holotype. 



Figs. 6-13. Coosia alethes (Walcott) 52 



6, Internal rubber cast of pygidium, xl-5 (coll. cnn/1) ; U.S.N.M. 

 144583, plesiotype. 7, Exfoliated cranidium, Xl.5 (coll. cnn/4) ; U.S.- 

 N.M. 144584, plesiotype. 8, Small, exfoliated cranidium, X5. 9, Ex- 

 foliated cranidium, Xl-S. 10, Internal rubber cast of cranidium, Xl.5. 

 11, Exfoliated pygidium, x2 (coll. cnn/3) ; U.S.N.M. 144585, ple- 

 siotypes. 12, 13, Two views of immature, partially enrolled exoskeleton 

 lacking only the free cheeks, X 10 (coll. cnm/2) ; U.S.N.M. 144586, 

 plesiotype. 



Figs. 14-22. Coosina amage (Walcott) 50 



14-16, Dorsal, lateral, and frontal views of exfoliated cranidium, x2. 

 17, Cranidium, x3. 19-21, Dorsal, lateral, and posterior views of py- 

 gidium, x2. 22, Internal rubber cast of pygidium, X2 (coll. cnm/2) ; 

 U.S.N.M. 144580, plesiotypes. 18, Pygidium, X2 (coll. cnm/3) ; 

 U.S.N.M. 144561, plesiotype. 



Figs. 23-25. Pemphigaspis, sp. undet 44 



23, 24, Lateral and dorsal views of cranidium, X5. 25, Ventral view of 

 pygidium, x5 (coll. cnn/3) ; U.S.N.M. 144562. 



Fig. 26. Coosia robusta Walcott 53 



Rubber cast of interior surface of pygidium, Xl.5 (coll. cnn/1) ; U.S.- 

 N.M. 144587, plesiotype. 



Fig. 27. Coosina ariston (Walcott) 51 



Exfoliated pygidium, X2 (coll. cnm/2) ; U.S.N.M. 144581, plesiotype. 



Plate 8 

 Figs. 1-4. Dresbachia amata Walcott 61 



