Pago. 

 &rEPITTEgHArTT5~tfcOeAW EH jU6')- UNISULCATUS 216 



Fig. 22. View of the central part of the head, deprived of the postero-lateral limbs. 

 23. View of the pygidium, associated with the above 



C'iaj:FiCErHALUs~XE D'^^A-N ' ga r e ft)^MAcuLosus 215 



Fig. 24. View cf the central parts of the head, showing the rounded glabella, with faintly- 

 marked furrows, and the postuloso surface of fixed cheek, and frontal limb. 



25. A movable cheek of the same species, presenting the same surface-markings. 



26. ? View of a pygidium found associated with the above parts, but not showing pustuloso 

 ^f ' * markings. 



PtYCHASPIS' PUSTULOSA 223 



Fig. 27. View of the glabella and fixed cheeks, the postero-lateral limbs having been removed. 



GlJTCPICEPHALUS ( B ATHT-effPfT*-) ANGULATUS 220 



Fig. 28. View of the specimen described, as it appears on a gutta-percha cast, from the im- 

 in-essiou in the stone. 



.D.IKSljeetEPH.AJyBS- FLABELLIFER 227 



Figs. 29-30. Vertical and profile views of the pygidium, showing the broad, undulating, lateral 

 lobes and digitate external border. 



"Ccrreftt-^RODUCTA , 244 



Fig. 31. View of the central parts of the head, the anterior limb broken away. The large 

 palpebral lobes are shown, extending almost to the top of the glabella. 



32. View of a fixed cheek, associated -with the glabella. 



33. View of an impression, showing the pygidium, which has probably been shortened by 



the contortion of the shale, and part of the thorax, while the one attached to the 

 thorax has been obliquely lengthened. 



34. View of a separated pygidium. 



OGygS^parabola 245 



Fig. 35. View of the pygidium, showing the elongate form and the straight cylindrical axis, 

 with the single bulbous anterior ring. 



Dll«ii!iOCEBHAl;tJS~(£lER6CEPHALUS-) BILOBATUS 226 



Fig. 3fi. View of the under side of the pygidium described, showing the form and broad recurv- 

 ing selvage. 



DiKELLOGEPHA-fcUS MDLTICINCTUS 226 



Fig. 37. View of the specimen described, showing the general form, with the margins restored 

 in outline, partly from another specimen. 



eirARIOClPJHLAteS TDMIFRONS 221 



Fig. 38. View of the glabella and fixed cheeks, showing the glabella projecting in front of the 



anterior limb, and the two deep glabellar furrows. • 



30. Profile view of the same individual, showing the short frontal limb, with the glabella 

 projecting beyond it. 



