108 H. Woodward—Eurypterus lanceolatus. 
specimens of Furypteride have been obtained, has laboured on 
incessantly, since the first discovery of these beds in 1851,* and 
has increased our knowledge of these remarkable Crustaceans 
by more perfect specimens from year to year. The British 
Museum has lately acquired, among other specimens, the im- 
- pression and counterpart of a very beautiful and nearly perfect 
example of Lurypterus lanceolatus from this locality, and an 
outline-figure (restored to the natural position) is given here- 
with (Pl. V.), showing the upper and under surfaces of the body. 
The specimen measures only 4 inches in length, and barely 
1 inch across the fourth (or widest) thoracic segment. The 
absent organs are correctly represented from other specimens. 
The position of the eyes, not clearly seen in this specimen, and 
also the antennules, are given upon the authority of, and from 
careful drawings sent me 3 by, Mr. Slimon, whose accuracy may 
be safely relied upon. The details of the antenne and swim- 
ming-feet, the form of the carapace, the thoracic appendage, 
body-segments, and telson are all copied from actual speci- 
mens. f 
In the form of the joints of the swimming-feet, in the 
number of the body-segments, the shape of the telson and 
thoracic plate, it closely agrees with the American, and, so 
far as known, with the Russian, species of Hurypterus; but the 
carapace is more oblong-ovate vertically, whilst that of the 
American species is much broader and shorter in proportion. 
The eyes in F. lanceolatus are placed much nearer to the 
margin of the carapace than in other species; the swimming- 
feet are longer and narrower, and the thoracic plate seems 
deeper in proportion to its width, as compared with James 
Hall’s figures of the American Kurypterus remipes, &c. This 
is not absolutely the case, however; but is, I believe, due in a 
reat degree to an error in Professor Hall’s restoration, in which 
the broad basal joints of the swimming-feet, and part of the 
post-oral plate are placed considerably beyond the posterior 
margin of the carapace, so that they overlap nearly one half of 
the thoracic plate,t a position which it would seem impossible 
* See Report of the Meeting of the British Association at Glasgow for 1855, 
and Sir R. I. Murchison’s paper on the Geology of Lesmahagow, Quart. Journ. 
Geol. Soc., vol. xi. 1856. 
af ‘Another nearly entire, but much distorted, example has been obligingly lent 
me by Mr. Bryce M. Wright, from which I have been enabled to make out the form 
of the post-oral plate and some other parts more distinctly than before; but I am 
especially indebted to Mr. Slimon for his drawings, which have been of the greatest 
assistance. 
{ In Hall’s figure they overlap the body to the extent of the first thoracic 
seoment; the thoracic segment being equal in depth to the first two thoracic joints 
which it covers, 
