PLATE XXVI. 



Illustrating the Masticatory Apparatus ok Gastric Teeth of Dithyrocaris. 

 See pp. 194—198. 



(Figs. 2—8 of natural size. Figs. 1 and 9 — 44 magnified twice the natural size.) 

 Fig. 



1. Dextral. Copied from ' Geo]. Mag.,' 1865. pi. xi, fig. 3 b] n , , _ _. ,. . , . 



2. g^ 3 ( Orchard Quarry, Thornhebank, four 



3. fia 3af m ^ es ? rom Glasgow, Renfrewshire. 



4. Dextral „ fig. 4 ^ . . 



k n ° . V Lower Marine series, Campsie. 



"• m >i ng. 4<aJ l 



S' Dextral » .. Jg-6 1 Orchard Quarry, Thornliebank. 



'• >> >, fig- o a) 



8. Both Dextral and Sinistral, but not distinct. Copied from ' Geol. Mag.,' 1865, pi. xi, fig. 8. 

 Lickprivick Quarry, two miles south-west of East Kilbride. 



9.\ Sinistral. Museum Geological Survey of Scotland. No. 5, F 2 T 2 . Lower Limestone Group. 

 10. J Cowden's Quarry, Dunfermline. 



ll.\Sinistral. Museum Geological Survey of Scotland, No. 2, F 2 ¥ 2 . Lower Limestone Group. 

 12./ Dolly Quarry, Drumford, Dunfermline. 



13.)Dextral 



14. j { ase „ , ^British Museum, No. 32, 59,776. Orchard Quarry, Renfrewshire. 



15.^ 



16. 



17. "1 Sinistral. British Museum, No. 33, I. 754. Orchard Quarry, Renfrewshire. 



18. j (Base of tooth ironstone.) 



19.) Dextral. British Museum, No. 31, 42,513. Coal-measures, Newcastle-on-Tyne. 



20. J (Base of tooth slightly calcareous.) 



21. Dextral 



22. Dextral, reversed. (Base of tooth calcareous) 



23. 1 Sinistral 



24. J (Calcareous base) 



25 ) 



" J-Sinistral 



27. Dextral ) 



28 (?). VNeilson Collection, marked L. Orchard Quarry, Renfrewshire. 



29. SiuistralJ 



30.) Dextral. Neilson Collection, marked K. East Kilbride. 



31. j (Calcareous base.) 



32. Dextral. Neilson Collection, marked L. Orchard Quarry, Renfrewshire. 



33.) Sinistral. (Reddish specimen with non-calcareous base of tooth.) Neilson Collection, marked N. 

 34. f Cock-of-Arrau Upper Limestone series. 



?jH Sinistral. Dunn Collection, marked C. 12. Redesdale. 

 3b. J 



.\Dextral . 



I (Base of the tooth ironstone) I . . , 

 ' )y ' VBntish Mi 



•JDextral J 



Dunn Collection, marked C. 12. Redesdale. 



kJDextra 



39. \ 

 40.} 



'1 



tral /-Neilson Collection, marked L. Orchard Quarry, Renfrewshire. 



41. Sinistral-' 



42. Sinistral. Yorkshire College Museum, Leeds. Eccup, Yorkshire. 



13. Dextral. Neilson Collection, marked M. Encrinital Limestone, Skateraw, Dunbar. 



II. Both ; sinistral lying on the dextral tooth. Mus. Pract. Geo]., 6264. Tyrone or Londonderry. 



