PLATE 61. 



Fig. 1. 306. 3. AsAPHirs ? NODOSTRIATUS. (Pag. 248.) 



1 a. The fragment, natural size. 



1 b. A magnified portion of the surface, showing the lamellose stria;, witli small nodes which interrupt the 

 lines. 



Fig. 2. 303. 4. Ceratjkus? PTTSTTiLosus. (Pag. 246.) 



•2 a. The fragment, natural size. 2 6. A magnified portion of the same 



Fig. 3, 4. 43. 1. IsoTELUs gigas. (Pag. 231.) 



3 a. The buckler of an individual of medium size. This is more extended in front, and the eyes are more 

 prominent than usual. 



3 b. The caudal shield, corresponding in size to the buckler. The crust is removed, showing the lines of the 

 articulations. 



3 c. A portion of the surface of the buckler enlarged, showing a peculiar punctate structure which is scarcely 

 visible to the naked eye. 

 ■ 3 d, e. Lateral and dorsal views of a small perfect specimen from Kentucky. The buckler is somewhat com- 

 pressed or bent in front, so that the facial suture is not shown to its full extent. 



3/ Buckler of an individual of ordinary size. The eyes are prominent, but less proportionally elevated, ami 

 the whole less convex than the specimen 3 a. The course of the facial suture is distinctly visible. 



3 g. Caudal shield corresponding in size to the buckler 3/ ; the marks of the transverse segments scarcely 

 visible. 



3 h. View of the eye of 3 /(natural size), as seen looking forwards and outwards. 



3 i. Oblique front view of the eye, which, under ordinary magnifying glasses, presents no granulations. 



3 k. The labrum or epistoma, showing the inner or upper side. 



3 m. A portion of the same enlarged, showing the strise upon the surface. 



4 a, b, c. Front, lateral, and dorsal views of the original specimen to which Green applies the name of /. 



ryclops. 



