CRUSTACEA AND ARACHNIDA OF THE CARBONIFEROUS ROCKS. 529 
Puate XXIX, 
Fig. 16. Glyptoscorpius perornatus, nat. size, showing portion of carapace and five body segments, 
Fig. 17. Glyptoscorpius Caledonicus (Cycadites Caledonicus, Salter). Portion of right comb organ, 
and casts of portions of body segments; nat. size. 
Fig. 17a, Glyptoscorpius Caledonicus, Portion of left comb organ, with some of the filaments hidden by 
the cast of a limb-like organ with deeply fringed margin ; nat. size, 
Fig. 176. Glyptoscorpius Caledonicus, Counterpart of portion of 17a, showing more of the comb and 
limb ; nat. size. 
Fig, 17c. Single filaments of comb represented in fig. 17. Magnified to show serrated edges. 
Fig. 18. Glyptoscorpius Caledonicus. From specimen figured by Salter, and from which he described 
the Cycadites Caledonicus, Left comb organ ; nat. size, as seen from above, to show the 
curved rachis, and the manner of attachment of filaments, 
Fig. 18a, Diagramatic cross section of comb organ, fig. 18, which is partly preserved in the round. 
Fig. 19. Enlarged comb of recent scorpion, drawn in the same position as fig, 18, for comparison. 
After Ray Lankester. 
Figs. 20 and 20a. Counterparts of portion of comb organ of Glyptoscorpius sp., nat. size. 
Fig. 21. Comb organ of Glyptoscorpius sp., nat. size. 
Fig. 22. Glyptoscorpius sp. Third, and portion of fourth joint of walking limb ; nat, size, to show 
nature of articulations. 
Fig. 23. Portion of limb of recent scorpion, slightly magnified, for comparison with fig. 22. 
Horizon and Localities, 
Figs. 17-17a, 20 and 20a. Calciferous Sandstone series, Lennel Braes, near Coldstream, Berwickshire. 
Figs. 18-18a. Calciferous Sandstone series, Cockburnspath, Berwickshire. 
Fig. 16. Calciferous Sandstone series, River Esk, 4 miles south of Langholm, Dumfriesshire. 
Fig. 19. Recent, South America. 
The Calciferous Sandstone series of Scotland is now regarded by the Geological Survey as the equivalent 
of part of the lower portion of the Carboniferous Limestone series of England, 
