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PLATE 66. 



Fig. 1. 301. 2. Ceraurus PLEiraEXANTHKMUs. (Pag- 242.) 



1 a. A fragment of a large individual, preserving the buckler and eight articulations of the thorax. The sur- 

 face is beautifully and evenly granulated or papillose, with larger tubercles upon the cephalic shield, 

 and mamillary tubercles upon the articulations ; these are enlarged in the figures 1 6, c, d. ** 



1 e. Front view of the specimen 1 a, showing the elevation of the oculiferous tubercles. 



If. One of these tubercles magnified. When magnified to this degree, they exhibit only rounded granulations. 



1 g. The cephalic shield represented in 1 a, showing the separation of the maxills 7 7 at the facial sutures. 



1 k. The right maxilla, separated from the cephalic shield. (This figure on the plate is without a number.) 



Fig. 2, 297. 2. Calymene becku. ( Pag. 250.) 



2 a. An entire specimen, with the exception of the maxillary shields, which are separated at the facial suture, 



leaving the cephalic shield in the usual form. 

 2 b. An imperfect specimen, with the maxillary portions partially preserved, but separated at the suture, and 



pressed downwards. 

 2 c. The thorax and caudal shield, preserving the crust, with the tubercles upon the middle lobe, in a, very 



perfect manner. 

 2 d. The cephalic shield, with the maxillary portions separated at the facial suture. 

 2 e. The cephalic shield entire, but so much compressed that the eyes are obliterated. The posterior angles 



are too much rounded in the figure ; in other respects, the true form of the buckler is represented. 

 2f. The cephalic shield preserved in compact calcareous stone. 



i g. A larger specimen, in compact limestone, preserving a more convex form in all its parts. 

 2 A. A small individual, preserving the thorax and the maxillary portions of the buckler, the glabella being 



separated. 

 2 i. The maxillary shields, as they frequently occur in the slate, separated from any other part of the fossil. 



The lower figure is the labrum. 

 2 At. a single maxillary shield of this species. 



Fig. 3. 303. 4. Calyheve (Species undetermined). (Pag. 253.) 



3 a. A part of the thorax, preserving eight or nine articulations. 



3 b. The caudal shield, with a few segments of the thorax. 



Fig. 4. 309. 5. AsAPHUs? latimaroinata. (Pag- 263.) 



4 a. The caudal shield of a small individual. 



4 b, A fragment of the lateral lobe of the caudal shield of a larger individual. 



Fig. 5. 43. 1. IsoTELUS OIOA8. (Pag. 254.) 



Tlip labmm or epist^a of a very large individual. 





