EURYPTERID REMAINS FROM THE PENTLAND HILLS. 585 



probably approximates closely to the true form. The form of the carapace reminds one 

 of Stylonurus, being distinctly horse-shoe shaped, with a well-marked marginal band. 

 The eyes are situated rather far back, and show only a narrow semi-circular band. This, 

 however, is probably merely the outer margin, and does not represent the size of the 

 whole visual area. The body expands slightly down to the fourth segment, and then 

 contracts regularly to the tail. The last segment is very long and conical like the corre- 

 sponding one in D. bembycoides. The telson is remarkably large, being nearly half 

 as long as the body, and is covered with the granular markings characteristic of this 

 form. 



Of the Appendages, No. IV. is comparatively short, stout, and sub-conical. V. is 

 somewhat elongated, the 3rd joint being most markedly modified. The last joint is 

 conical and slightly concave on the posterior margin. This form of terminal joint seems 

 to occur in all the members of this genus. 



The last pair of appendages are considerably elongated, without, however, reaching 

 the specialisation shown in Stylonurus. They appear longer in proportion in this speci- 

 men than in the type, a difference which may be due to the different stage of growth of 

 the two. None of the segments are particularly elongated, and the chief point of 

 interest is the presence of short, coarse spines on the third and fourth joints. Spines 

 are not common on this pair of limbs in the Eurypteridse. A very large number of 

 specimens of this species in the Hardie Collection have not yielded any further information 

 of importance. 



Eurypterus scoticus. (PL IV., figs. 23-25. PL V., fig. 26.) 



Carapace conical, broadest at hind margin and narrowing forwards. Body progres- 

 sively wider to the third segment, narrowing abruptly at the 7th ; last five segments 

 almost equal in width ; dorsal surface with finely punctate markings. Appendages. — 

 2nd pair short, provided with spines ; 3rd, 4th, and 5th pairs long, the four distal joints 

 armed with a double series of long, curved spines directed forwards ; 6th with last seg- 

 ment (paddle) much narrower than penultimate. Gnathobases and metastoma un- 

 known . 



In my former paper I provisionally referred two fragments belonging to this 

 species to E. scorpioides (Woodward), as there was not evidence enough to justify the 

 foundation of a new species. A large number of fragments in the Hardie Collection 

 have, however, enabled me to found a new species with some certainty. 



Carapace. — The carapace (PL V., fig. 26) has a curved posterior margin and 

 somewhat rounded posterior angles. Its width in this specimen at this, the broadest 

 point, is about 100 mm. The lateral margin is concave, and narrows rapidly for the 

 hind one-third of its length, for the other two-thirds it is convex, the two sides sloping 

 in so that the anterior margin is scarcely one-third the width of the posterior. Nothing 

 could be ascertained as to the organs lying below the carapace, or as to the presence or 

 absence of eyes. 



