18 



gidium consists of only the axis." (Vide p. 206, plate 

 V, fig. 52, Prod, einer Monographie der Bohraischen 

 Trilobiten.) 



Cryptonymus punctatus, Wahl. 1821. 

 Plate I, Fig. 1-6 and 17. Plate III. Fig. 15-16. 



General form ovate ; length nearly twice the width ; 

 cephalic shield and pygidium about equal, excluding 

 the terminal mucro. Thorax nearly half the entire 

 length. Cephalic .shield semi-circular, gibbous in front; 

 its posterior angles are produced into extended sj^ines ; 

 its length equals about half its width ; the surface is 

 coarsely granulated with large tubercles, each with a mi- 

 nute perforation or puncture. (PI. i, fig. 9b.) 



The cephalic shield is bounded by a wide, thick edge 

 margin, which is narrow at the glabella, and covered 

 with two rows of tubercles — (Nieszk.) Glabella clavate 

 and gibbous, overhanging the slight anterior margin, 

 nearly spherical in front, where it has a distinct border 

 of large tubercles, (pi. i, fig. 1,) and narrowing anteri- 

 orly to half its front width, its base being less than one- 

 third of the entire width of the head ; two or three tu- 

 bercles are arranged on each side of the lower half of 

 the glabella, occupying the situation of the lateral lobes, 

 the furrows between which are not visible ; the dorsal 

 furrows are deep, the cervical furrow curving outwards 

 to the front ; the cheeks are separated with deep sulca- 

 tions from the margin of the head. 



The posterior branches of the facial sutures com- 

 mence on the exterior edge of the cephalic shield, just 

 above the posterior angles, and run in an oblique direc- 



