164 Prof. F. M‘Coy on the Classification of 
(large) hand with six or seven conical tubercles, that of the 
left with about four, outer side of each hand with two very 
obscure small tubercles near the carpus, and one much larger 
but less distinct near the origin of the fingers ; two blunt teeth 
on the inner edge of each finger; fail of the female broad 
ovate, of the male narrow hastate, terminal joint triangular, 
about 1th wider than long, penultimate joint the same length 
but a little wider, third jomt much wider than the others, but 
shorter than the fourth or fifth. Length about 1 inch 9 lines, 
width 2 inches. 
Common in the London clay of Sheppey. 
(Col. University of Cambridge and Mr. Bowerbank.) 
Zanthopsis bispinosa (M‘Coy). 
Sp. Char. Carapace transversely oval, about one-fifth wider than 
long, gently convex, two posterior pair of tubercles of the an- 
tero-lateral margin forming short, flattened, sharp spines, the 
anterior one forming a small, very obtusely angular projection ; 
crest of the large hand with four or five tubercles, outer side 
with two strong elongate tubercles near the carpus, and one 
large obtuse one near the origin of the fingers ; tail of the 
female broad oval, the last and the penultimate joint of equal 
length, the latter twice as wide as long, fifth jomt half the 
length of the penultimate. 
This is considerably wider and flatter than the Z. nodosa, and 
the tubercles on the branchial regions and those formed by the 
genital, cardiac and intestinal regions are much less prominent ; 
the hollow space along each side of the ridge formed by the medial 
regions is punctured almost as strongly as the rest of the carapace ; 
the tubercles on the ridge of the hand are fewer, but those on the 
outer side much more strongly marked; it is moreover easily 
distinguished by the two hind pair of tubercles of the antero- 
lateral margins forming depressed sharp spines in the one and 
large obtusely rounded nodules in the other. Length of carapace 
1 inch 9 lines, width 2 inches 3 lines. 
Common in the London clay of Sheppey. 
(Col. University of Cambridge and Mr. Bowerbank.) 
Zanthopsis unispinosa (M‘Coy). 
Sp. Char. Carapace suborbicular, length and width nearly equal, 
evenly gibbous, sloping almost equally to the front and to the 
back ; tubercles of the branchial and medial regions nearly 
obsolete, flattened, obscurely defined ; antero-lateral margin 
with the posterior tubercle on each side forming a strong, 
short, depressed triangular spine, the two anterior pair almost 
obsolete, each indicated by a faint wave in the margin. Length 
of carapace | inch 6 lines, width 1 inch 8 lines. 
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