EXPLANATION OF PLATE L 



rHOTOGRAPHED FROM THE QUART. JOUR. OF THE GEOLOGICAL SOC. 

 OF LONDON. VOL. VI, 1850. PLATE XXXII. 



Fig. L Cryptonymus punctatus, an adult specimen. 



Fig. 1 a. The same specimea, under side of the cephalic shield 

 showing the hypostoma, and the node against which it buts. 



Fig. 1 b. The eye magnified, upper side. 



Fig. 1 c. " " " lower .side. 



Fig. 1 d. The tenth thorax segment with spine on the axis ring. 



Fig. 2. The same species, adult specimen. 



Fig. 3, '■ " " the pygidium. 



Fig. 4. " " " the under side of the thorax and pygi- 

 dium, to .=how the bifid or notched terminations of the pleurae 

 and the manner in which they are facetted. 



Fig. 5. Ditto, the hypostoma : the hooded tip is slightly recurved. 



Fig. 6. Cryptonymus variolaris, a young specimen. 



Fig. 7. A rolled specimen. 



Fig. 8. Ditto, nearly full-grown. 



Fig. 8 a. Ditto, a side view of the same specimen. 



Fig. 9. Ditto, a fine specimen : the thorax is slightly bent back- 

 ward; it shows the sharpened front edges and notched pleurae. 



Fig. 9 a. Ditto, the under side of the cephalic shield of the same 

 specimen ; the hypostoma is not recurved at the tip, but regu- 

 larly convex. 



Fig. 9 b. Ditto, a few of the nodes with a punctum on each. 



Fig. 10. Ditto, an under view, showing a similar structure to thai 

 represented at figure 4. 



Fig. 17. Cryptonymus punctatus. This fine specimen shows an 

 anterior view of the course of the facial sutures. The figure 

 is copied from Nieszkowski's Monograph of the Trilobites of 

 the Silurian Formation m the Baltic Provinces. 



