126 Proceedings of the Royal Physical Society. 



opportunity of studying the specimen itself, yet, taking the 

 figure by Huxley and Salter, a reduced copy of which is 

 given in Plate IV. Fig. 6, I think there is still another view 

 to be taken of the structures there portrayed, viz. — that they 

 are those of a Diplopod Millepede. The middle lobe of the 

 figure probably represents the dorsal scute of a coalesced 

 pair of segments bearing two pairs of limbs, the coxae of 

 those of one side being left ; the other joints of the limbs, 

 similar to the one preserved on another segment, having 

 been wrenched off. The structure of the remaining lobes, 

 and their appendages, are quite in consonance with this 

 view. 



Explanation of Plate IV. 



Fig. 1, Pattonia Couttsi; natural size. Lower Carboniferous, East Kilbride, 



Lanarkshire. . From specimen in Museum of Science and Art, 



Edinburgh. 

 Fig. 1^. Right antenna of above ; magnified. 

 Fig. l'^. Limb of above ; magnified. 

 Fig. ic. Tip of limb of above ; magnified. 

 Fig. Id Diagrammatic scheme of double segment of above. 

 Fig. 1^. Diagrammatic outline to show mode of articulation of dorsal sclerite 



of double segments of above. 

 Fig. 2. Kampecaris Obanensis; -j-. Lower Old Red Sandstone, island of 



Kerrera, near Oban, Argyleshire. From specimen in Collection 



of Geological Survey of Scotland. 

 Fig. 3. Anihracodesmus Macconochiei ; f . Lower Carboniferous, Lennel Braes, 



near Coldstream, Berwickshire. From the specimen in the 



Collection of the Geological Survey of Scotland. 

 Fig. 3^. Eleventh and twelfth segments of above, further magnified, to show 



pattern of sculpture. 

 Fig. 4. Archidesmus loganensis; f. Upper Silurian, Logan Water, Lesma- 



hagow, Lanarkshire. From specimen in Collection of the 



Geological Survey of Scotland. 

 Fig. 5. Head and first four segments of lulus Blainvillei, recent, magnified ; 



for comparison. 

 Fig. 5^. Body segments of above, natural size, to show limbs and foramina 



repugnatoria, to compare with 1^, 

 Fig. 5^. Limb of above, magnified, to compare with 1^. 

 Fig. 5<5. Antenna of above, magnified, to compare with 1^. 

 Fig. 6. Necrogammarus Salweyi (Woodward) ; |. Ludlow, Leintwardine. 



