PLATE 80. 



Page 

 Fig. 1 - 13. EURYPTERUS REMIPES. 404* 



1. A young individual, dorsal side. 



2. A young individual, ventral side; showing the anterior feet, the postoral plate, with the 



artieulations of all the parts nearly entire. 



3. A young speeiraen, showing the upper side of tlie body , which is entire, except the poste- 



rior spine and a part of the anterior feet. 



4. A large individual of nearly the full size to which this species attains, lying upon its back, 



and having the lower or ventral side of the articulation removed; showing therefore the 

 inner side of the carapace, and the articulations of the thorax and the abdomen. The 

 anterior feet are partially jiresorved, and the swimming feet are entire, the lower side 

 being shown. At s, « is the line of the suture by wliich a triangular piece is attached to 

 the sixth joint, forming tlie fixed ramus of the chela, and over the upper surface of which 

 the free extreme Joint moves. The articulation of these parts with the body is not clearly 

 shown, from the incompleteness of the specimen, the parts to which they were attached 

 having been removed. 



5. An individual preserving more than usual convexity of body. The head and eyes are very 



perfect : the anterior feet are lost, but the swimming feet are well preserved in all their 

 parts, and the indented extremit ies are strongly marked. In the contraction of the extreme 

 joint, the fixed branch of the chela below is nearly covered. In comparing the swimming 

 feet in figures 4 and 5, it will be observed that in the former the lower side, and in the 

 latter the upper or dorsal side, is seen. 



6. A small carapace preserving the eyes. 



7. The abdominal articulations and the posterior spine, separated from the thoracic rings. 



8. An imperfect caudal spine, with the last two artieulations of the abdomen. 



9. Tlie caudal spine : a lateral view of a specimen not quite entire. The lefthand is the dorsal 



side, and the general form is triangular, becoming more convex on each side of the dorsal 

 edge towards the base. 



10. The ventral side of a fragment, showing, on the lefthand side of the figure at a, the ar- 



ticulations of one of the swimming feet, with the large maxillary joint, which is nearly 

 in its natural position, while the opposite one is displaced. The basal articulations of the 

 anterior feet are likewise seen more distinctly than in any other specimen : the first and 

 second are broken ofl', while the third is nearly entire, and preserves the minute spines 

 on the lower side of each joint. 



11. A fragment showing the inner side of several of the thoracic articulations, and preserving 



the anterior feet nearly entire, with the articulations of one of the swimming feet : the 

 place of attachment of these is obscured by some of the plates of the body below. 



12. The post-oral plate of this .species. 



13. An enlargement of the centre of the head of fig. 5, showing the small oeuliform spots. 



