EXPLANATIOXS OF PLATES. PPP. 39 



PLATE VI. 



EURYPTERUS MaNSFIELDI. 



Page 32. 

 A large specimen preserving the carapace, abdftmen and 

 telson nearly entire, with three of the palpi of the left side. 

 A portion of the test is removed along the median line ex- 

 posing the process of tlie epistoma or median appendage of 

 the thoracic plate. This fignre shows ver\^ satisfactorily 

 the mode of occurrence and association of these fossils. 



PLATE VII. 



EURYPTERUS MaISTSFIELDI. 



Fage 32. 

 The abdomen and telson of a specimen as it is seen lying 

 in the shale. Heliotyped directly from a plaster cast of the 

 specimen. 



PLATE VIII. 



EURYPTERUS MaNSFIELDI. 



Page 32. 



Fig. 1. A specimen preserving the body and telson, and 

 showing in a very perfect degree the surface sculp- 

 turing. This drawing M'as made from the si)eci- 

 men, Plate VII 



Fig. 2. An imperfect individual as it is seen lying on a 

 block of shale with some fragments of ferns and 

 other plant remains. 



Fig. 3. A separated palpus enlarged to two diamet«M-s show, 

 ing the form and ornamentation of the joints. \n 

 this specimen the terminal dactylus and latend 

 spine are free. 



