522 B. N. PEACH ON FURTHER RESEARCHES AMONG THE 
The comb mentioned as having been found by Mr. Stock is smaller when 
compared with the above, but it is essentially of the same character. It is 
preserved in the round as a cast in sandy shale. The outline of the rachis is 
visible along the curve for about 3°5 cm., but a portion of about 10 mm. long, 
near its outer extremity, has the leaflets attached. The rachis is very thick 
compared with those already described, being from 4 to 5 mm., and tapers off 
to a blunt point, while the longest leaflet preserved is only 6mm. The leaflets 
diminish in length outwards, and overlap each other in the manner of those of 
G. Caledonicus. The fossil being a cast gives no definite ornament, though 
there is a faint appearance as if the rachis had been embossed. This specimen 
shows very decidedly that the rachis was not of a nature to allow of its being 
wedged in between the opercular plates, else it would have been more laterally 
compressed (see fig. 21). 
Locality —Tweeden Burn, Liddesdale. 
Horizon.—Calciferous Sandstone Series. 
Collector.—Tuomas Stock, Esq., of the Museum of Science and Art, Edin- 
burgh. 
Single comb filaments have been obtained from the Liddesdale and Lang- 
holm beds. They are very apt to be passed over as “ Poacites,” and might 
easily be mistaken for Graptolites, as they are of a like horny texture, and 
have the edges similarly notched. There is a considerable variety in the shape 
and pattern of these filaments, showing that there are several Eurypterids yet 
to be described. 
Limbs.—A. portion of a limb with Eurypterus markings, and having a 
bi-ungulate tip, has turned up in the collection made by Mr. Macconocuts from 
Langholm. The specimen measures over 6 cm. (or 23 inches). It is made up 
of three joints, which correspond exactly to the last three of the recent scorpion 
limb. The portion of the topmost joint preserved is 2'°2 cm. long, and about 
6 mm. broad at its narrowest part, while across the articulation it swells out 
to 10mm. The tarsus is 1°7 cm. long, narrowest above where it measures 
only 4:5 mm., and broadening to 9°5 mm. at its articular extremity. Both 
these joints lie nearly in the same direction. The hand, which is bent upwards 
at a considerable angle, is 1°3 cm. long, 4 mm. broad at base, and expanding 
to7 mm. It supports two stout recurved claws, the tip of one being broken 
off ;* the other is nearly whole, and measures about 10 mm. along its curve. 
Above the articulation of the claws there is just such a projection of the test 
as in scorpion, which evidently fitted in between the claws when the animal 
was alive. From the lower part of each articulation a spine-like projection 
is given off. This is serrated with the Eurypterus marginal ornamentation. 
* Since the above was written a further examination shows that the rest of the claw is present, 
but that it passed down into a lower stratum of the matrix. 
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