CRETACEOUS CRUSTACEA. 345 
Fig. 3. A fragment of the same species, consisting of the anterior part of the 
carapace and part of the left claw. 
Fig. 4. A fragment too imperfect to afford any satisfactory determination of 
its true characters. The thick, short hand has the appearance of a monstrosity 
or of a restored limb. 
Fig. 5. This is probably a younger, and perhaps a female specimen of the 
same species as figs. 1 & 2. 
Paleastacus macrodactylus, Bell. (Tab. XXXVIII*. fig. 6.) 
Two claws of a very different form from those of the other species, in which 
the hand is comparatively much shorter, and the fingers much longer and more 
slender, both being curved equally and in the same direction, so that they are in 
contact through their whole length. This specimen may be referred provisionally 
to a species called Paleastacus macrodactylus. 
Fig. 7. Inner view of the claw of probably another species of the same or a 
nearly allied genus. 
BRACHYURA. 
Platypodia Owen, Bell. (Tab. XXXVIII*. fig. 9.) 
The carapace, fig. 9, obviously belongs to a species of Platypodia, to which I 
beg to give the name of Pl. Oweni, as one which my lamented friend Mr. Dixon 
would have been particularly pleased to recognize and sanction. 
GrapsiForM Bracuyure. (Tab. XXXVIII*. fig. 12.) 
The figure above-cited represents certain legs of one of the most remarkable 
forms hitherto observed amongst the fossil crustacea of the chalk. The general 
prima facie character of the two larger feet gives the impression that they belong 
to a Grapsus, or to one of the land-crabs, or some allied form; but the small 
foot posterior to them leads almost to the conclusion that the species belonged 
to that aberrant tvpe in which the posterior feet are diminutive and almost rudi- 
mentary. The claw, fig. ]1 a, obviously belongs to the same species, and is very 
grapsoid in its character. 
