156 MR MALCOLM LAURIE ON SOME EURYPTERID REMAINS FROM THE 



proportion to the rest of the animal, and is marked as usual in this genus by a longi- 

 tudinal ridge. The dimensions, as far as they could be ascertained, are — 



9 mm. wide. 



10? long. 



6-5 



9 „ 



6-5 



13 „ 



4-5-5-5 . ,, 



• > ■ 



The 4th segment thus increases in width, while of the last segment only a small 

 portion is seen. Fragments of a few joints of a second limb on this side can be made 

 out, and seem about the same width as the posterior one. 



On the left side portions of two limbs are also seen. One shown in the cast (fig. 9) 

 is very similar to the limb described on the right side, though differing slightly in size. 

 The measure of the segments preserved is — 



11 mm. long. 6 mm. wide. 



17 „ 5 



9 5 „ 



Of the other limb on this side only the last 32 mm. are seen. It is peculiar in being 

 very much narrower than those described above, the width being 2*5 mm. A longi- 

 tudinal ridge can be made out, and the terminal joint, which is seen on both specimens, 

 tapers to a point. If this limb corresponds to the anterior one on the right side it must 

 taper very rapidly, and if not, then there is in this species a third limb rivalling the 

 other two in length. The presence of this narrower limb, together with the size and 

 position of the eyes and the shape of the metastoma, are sufficient to characterise this 

 species, though the form of the carapace and the telson are also characteristic. 



Eurypterus (Dekay). 

 This genus is represented by the remains of at least three distinct species. 



Eurypterus scorpioides (Woodward). 



Portions of four band-like sclerites, measuring when complete about 90 mm. in width 

 and each 15 mm. in length, probably belong to this species. They are covered with 

 punctate ornamentation, and each segment bears a pair of subcentral tubercles about 

 1 *5 mm. in diameter and 6 mm. apart, which are rather nearer the posterior than the 

 anterior margin of the segments. They must have belonged to a specimen somewhat 

 smaller than that figured by Dr Woodward (Monograph, pis. xxix. fig. 1, xxx. fig. 9), 

 but resemble his figure very closely both in the markings and in the presence of the pair 

 of tubercles. 



The body and tail of a very large Eurypterus may be provisionally referred to this 

 species, pending the discovery of further remains. It resembles the figure in Dr 

 Woodward's Monograph (pi. xxix. fig. 1) in general form and in the nature of the 

 markings, but exceeds it considerably in size. 



