~ 
some British Fossil Crustacea. 175 
of the second pair; carpus about one-third the length of the 
arm and half the length of the hand, the width of which latter 
at top exceeds half its ‘length; three next pair of legs compressed, 
gradually diminishing in size ; fifth pair not seen. At about 
9 inches from their bases the external antennz are one-fourth 
of an inch in diameter. 
I have great pleasure in dedicating this fine species to Mr. 
Bowerbank, who has done so much to illustrate the fossil botany 
and zoology of the London clay—his work on the former having 
almost created the subject ; while the extraordimary extent and 
beauty of the collections which he has made of the other fossils 
of that formation are, I believe, quite unrivalled, and when fully 
published will demonstrate a richness in the fauna and flora of 
the eocene period in Britain for which few geologists are pre- 
pared. I have especially to record my obligations to him for 
sending mea large number of his choicest specimens of London- 
clay crustacea of those species which I informed him I was about 
describing from the Cambridge collection, but the specimens of 
which at my disposal did not fully exhibit all the characters of 
the species ; and having mentioned my anxiety to render my de- 
scriptions of those as perfect as possible, without entering further 
on the extensive subject of the Crustacea of that formation. 
The present species is usually found with the abdomen doubled 
close under the thorax, which latter is almost always crushed, 
owing to the fragile delicacy of the crust. 
Rare in the London clay of Sheppey. 
(Col. University of Cambridge and Mr. Bowerbank.) 
Hoploparia (M‘Coy), n. g 
Etym. é7Aa, arma, and trapeva, gena. 
Gen. Char. Carapace minutely granulose, oblong, tumid, slightly 
Hoploparia. 
compressed, a little deeper than wide, ending in front in a 
strong sharp rostrum, the sides of which are strongly carinate 
