WATERLIME GROUP. 409* 



This species differs from E. remipes in its greater size, and less abrupt attenuation 

 towards the tail, wliile the carapace is pi'oportionally broader and shorter. There are 

 likewise differences in the anterior feet, and in tlie form of the postoral plate; the 

 entire form of this latter appendage not having been fully determined. 



PLATE LXXXI. 



Fig. 1. A young individual, preserving but one of the larger appendages on one side : the 

 posterior spine is brolcen off near the distal extremity. 



Fig. 2. An individual of medium size, preserving all the articulations of the boly, the fourth 

 foot, and one of the swimming feet imperfect. 



The specimen lies upon the stone with the back downward, and the crust from 

 the lower side is almost wholly removed, so that the iimer sides of all the parts 

 are seen, and the cavities of the eyes. The last joint of the swimming foot is 

 Rcparated at the articulation (r), and the suture at the base of the fixed ramus 

 of the chela, which is naturully solid, is slightly separated (s). The other joints 

 are somewhat distorted by pressure, which has been directed from below upwards. 

 On the right side of the figure, and on the last articulation, there arc small 

 portions of the ventral crust remaining. In this specimen, the interior of the crust 

 being seen, the imbrication of the rings of the body is reversed. 



Fig. 3. The exterior of a head or carapace of a larger individual, which preserves the eyes. 



Fig. 4. The two posterior annulations of the body, with the caudal spine attached. The 

 specimen lies with the dorsal side downwards ; the ventral crust being removed 

 from the annulations, and the lower concave side of the caudal spine is shown. 



Fig. 5. A separated caudal spine, showing the lateral and lower sides. The specimen is much 

 compressed. 



Fig. 6. The ventral side of the body, preserving nine of the segments ; the upper two are 

 joined by a close suture, and sustain a locomotive [?] appendage. 



Fig. 7. The upper thoracic segment separated from the body, and scarcely showing the suture 

 line : the articulated appendage is imperfect. 



Fig. 8. A very large thoracic segment, showing the suture lino and the appendage before 

 mentioned, from which the lower articulations are separated. The continuation is 

 drawn from the one shown in fig. G. 



Fig. 9. A single articulation of the thorax. The line near the upper margin, including a 

 portion which is brolcen off, indicates the extent of the imbrication of the next 

 superior segment. 



Fig. 10. A part of a segment which is longitudinally divided ; a feature shown along the 

 dorsal line in several articulations in another nearly entire individual*. 



Fig. 11. A portion of the surface of fig. 8 enlarged. 



PLATE LXXXI A. 



Fig. 1. A large individual which is deprived of the appendages, except one dismembered 

 swimming foot. The specimen is compressed, and the little pustule-like scales 

 have the appearance of pores in the crustt. 



Individuals of this species frequently attain a larger size than this, as seen in 

 other figures. 



• It is probable that this dehiscence of the rings along the back is connected with the process of casting 

 the crust. 



t These have been very incorrectly represented in tlic drawing; there being but two rows, and liiesc not 

 parallel, on the six posterior joints, while the six rows arc but indistinctly visible on a few of tlie thoracic 

 segments. 



[ Pal^ontoloot III.] 55!* 



