PLATE 67. 



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Thin 



Fig. 1. 307. 1. Trindclecs concentricus. (Pag. 255.) 



1 a. A large individual, destitute of spines upon the posterior angles of the buckler and (glabella. The border 



in front of the glat>ella has three distinct rows of punctures, four in front of the cheeks, and five on 



each side, with six or seven near the trase. 

 1 b. The thorax and caudal shield enlarged, to show more clearly the character of the segments. 

 1 e. A smaller specimen, preserving the spines of the trackler There are four rows of punctures in front, and 



six on each side of the buckler. 

 1 d. The buckler, preserving the posterior spine of the glabella. 

 1 e. Fragments of the cephalic border, showing a variable number of rows of punctures in front ; one having 



live, with seven or eight at the posterior margin. 

 I /. A portion of the marginal fillet, where the crust is partially removed, showing the little studs or points 



which fill these pores from below. 

 I g. A fragment of a large buckler, having but two distinct rows of punctures in front of the glabella. 

 1 A. A portion of the thorax and caudal extremity, from the glazed slate at Waterford. 





Fig. 2. 310. 1. Olenus asaphoides. (Pag- 256.) 



2 a. An imperfect cephalic shield, witli several articulations. 2 b. A smaller imperfect cephalic sliield. 



2 e. A fragment of one of the lateral articulations of the thorax. 



311. 2. Olencs undulostbiatus. (Pag. 258.) 



3 a. The fragment, natural size. 



3 6. A part of the same enlarged, showing the course of the facial suture, and the rugose striated glabella. 



Fig. 4. 297. 2. Calymene beckii. (Pag. 250.) 



4 a. The buckler, with a few of the articulations of the thorax. The specimen is very much compressed, and 

 the crust removed. 



4 b. A specimen of the same fossil, presenting nearly the entire length of the individual. 



4 e. An impression of the body, showing the indentations produced by the short spines upon the back. 



4 li. A portion of the same enlarged, showing the impressions of the fine granulations of the crust. 



4 e. A fragment preserving an impression of a part of the central and one lateral lobe of this species. 



312. 1. Agnostus LOBAT08. (Pag. 258.) 



5 a, b. Individuals of the natural size. 5 e, d. The same magnified. 



5 e,/. Specimens showing an articulation of the lobee. Magnified views. 



f 

 Fig. 6. 313. 1. Thaleops (Illjenus) ovatus. (Pag. 259.) 



6 o. The specimen of the natural size. The upper figure has a strong thick spine at the posterior angles of the 



cephalic shield. 

 6 *. A part of the cephalic thield magnified, showing the punctures and the course of the facial suture. 



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