PLATE 75. 



P»ge 



Fig. 1. Dalmania pleuroptyx. 356 



1. The specimen is a cast preserving a part of the head, the axis and one lateral lobe of the 

 thorax, and a part of the pygidium. From the condition of the specimen, it cannot be 

 positively referred to this species, though there can be little doubt of its identity. 



Fig. 2. Dalmania nastjtus. 362 



2. The inner side of the crust of a pygidium, showing the thickened border and a part of the 

 posterior spine. 



Fig. 3-6. Dalmania tkidens. 861 



3. The underside of a portion of the head, showing the cavity of one eye and the extension of 



the frontal process. 



4. A fragment of the lower surface, showing the marginal limb on one side and the frontal 



process. The abruptness of the junction of the process with the marginal limb, as re- 

 presented in the figure, is due to an imperfection in the specimen at that point. 



6 & 6. Fragments of the marginal limb and the frontal process fri^m the lower side, with 

 portions of the surface enlarged. 



