178 Prof. F. M‘Coy on the Classification of 
the great one, but about one-third less wide; other legs very 
slender (third and fourth pair about 3 lines wide), subcom- 
pressed, smooth. 
This fine species much resembles our common recent lobster 
at first sight, and has as large or even more robust claws, but 
similarly armed: in by far the greater number of specimens the 
characteristic prolongation of the cheeks, with its spinose keel 
becoming fixed in the matrix, causes the entire front of the cara- 
pace from a little behind the rostrum to be broken off, and so 
leaving no trace of this part of the carapace, heightens the resem- 
blance indicated by the specific name. 
Common in the London clay of Sheppey. 
(Col. University of Cambridge and Mr. Bowerbank.) 
Hoploparia Belli (M‘Coy). 
Sp. Char. Carapace averaging from the orbit to the posterior 
side margin 1 inch, depth of side 9 lines, closely punctured 
on the middle of the back, and very closely and uniformly gra- 
nulated over the sides ; nuchal furrow considerably nearer the 
posterior margin of the carapace than the edge of the orbit 
(measured a little one side of the mesial line), its ends reach 
two-thirds of the way from the mesial line to the lateral mar- 
gin; A-like cheek-furrow strong ; sheath-like prolongation of 
the cheeks obtusely rounded, the margins and lateral angles 
much inflexed, about half the length of the rostrum, two or 
three obtuse, undefined nodulations on the rounded promi- 
nence which extends backwards from its contracted carinate 
end towards the cheek-furrow ; bayonet-shaped antennary scale 
narrow, extending as far as the tip of the rostrum ; one blunt 
tubercle about twice its diameter from the median line on each 
side of the base of the rostrum, and another similar one at an 
equal distance below it on each side: abdomen thick, each seg- 
ment having a gently convex smooth anterior articular portion 
divided by a strong deep furrow from the rest, which is flat- 
tened and very closely and strongly punctured ; epimeral ex- 
tremities of the first jomt rudimentary, of the second broad, 
subquadrate, rounded on the anterior and external edges, sub- 
truncate behind, with the angle forming a short spine, third, 
fourth, fifth and sixth terminating in broad triangular plates, 
slightly falcate, the sixth rather longer than the preceding 
ones, and having the posterior lateral angles produced back- 
wards into a small spine on each side of the base of the seventh 
jot or middle tail-flap, which latter is subquadrate, its length 
and the width of the base being equal, narrowing towards the 
end, which is rounded and terminates at each angle in a small 
sharp spine; side margins thickened, minutely dentated : first 
