520 B. N. PEACH ON FURTHER RESEARCHES AMONG THE 
specimen from Coldstream Bridge shows a fringe which must have belonged to 
a still larger limb than any of the Lennel Braes fossils. 
Body Rings.—As regards size, these are in keeping with the limbs ; but 
there are only portions of one or two of them from which to judge of the rest. 
One fragment of what appears to be the fifth or sixth dorsal plate measures 
10°5 cm. from its anterior articular face to its posterior margin, and 15:2 cm. 
from the central line of ornament on its back to the broken edge of the speci- 
men, which does not show the lateral margin. This plate must therefore have 
been more than 1 foot across. Another plate, only 4:5 cm. in depth, must 
have succeeded close to the carapace. It too is broken, and there are no 
means of judging of its breadth except that the comb organs each measure 
17°5 cm. at least. This plate then could not be less than 16 to 18 inches 
broad. Both these plates and the portions of others more fragmentary still 
show that they were covered by the scale-ornament. This is small compared 
with the size of the plates. As in other Eurypterids, the scales are only 
slightly concave, and most numerous near the anterior margin, becoming 
larger, deeper, and more scattered as we proceed backwards. The posterior 
margin of the plates is ornamented with a broad band, and scolloped with small 
scollops on its edge. The largest plate shows a symmetrical pattern in the mid 
line, like that observed on the G. perornatus. 
Combs.—The greater part of both combs are preserved in good condition for 
study. They must have measured at least 17°5 cm. each from base to tip. 
They each consist of a broad rachis 1:1 cm. across the broadest part of the 
specimen measurable, which is at least 8 cm. from the possible base where it 
was probably broader. They taper gradually to blunt points. From the base 
they curve backwards very gently at first, and then gradually and increasingly 
to the tips. They have been attached only by their base, their whole upper 
margin being quite free. On the lower or concave margin they give attach- 
ment to two rows of long flattened hollow leaf-like filaments, which are set 
obliquely to the long axis of the rachis, and with their exterior margins directed 
towards its tip. They therefore overlap from within outwards. As well as 
this, the inner edges of the filaments of the separate rows extend beyond the 
middle line, and as the leaflets in each row are given off alternately their inner 
edges interlock (see fig. 18). Those filaments attached near the base appear to be 
the longest, where they measure 4 to 5.cm. From this they gradually decrease 
towards the tip, so that the limit of their extremities forms a nearly straight 
line. They are on an average a little over 1 mm. in breadth, their sides are 
for a considerable part of their course almost parallel, and they converge gently 
and increasingly to the tips. All the filaments are set outwards at angles from 
45° to 60° to the stem. They are at first straight, and then gently curved 
outwards towards their points. The rachis is ornamented with pyriform or 
