WATEKLIME GROUP. 
409 * 
This species differs from E. remipes in its greater size, and less abrupt attenuation 
towards the tail, while the carapace is proportionally broader and shorter. There are 
likewise differences in the anterior feet, and in the form of the postoral plate; the 
entire form of this latter appendage not having been fully determined. 
PLATE LXXXT. 
Fig. 1. A young individual, preserving but one of the larger appendages on one side : the 
posterior spine is broken off near the distal extremity. 
Fig. 2. An individual of medium size, preserving all the articulations of the body, 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 inner sides of all the parts 
are seen, and the cavities of the eyes. The last joint of the swimming foot is 
separated 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 are 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 line and the appendage before 
mentioned, from which the lower articulations are separated. The continuation is 
drawn from the one shown in fig. 6. 
Fig. 9. A single articulation of the thorax. The line near the upper margin, including a 
portion which is broken 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 the drawing; there being but two rows, and these not 
parallel, on the six posterior joints, while the six rows are but indistinctly visible on a few of the thoracic 
segments. 
[ Palaeontology III.] 
52 
