PLATE XXVI. 



Illustuatino the iM-vsTiCATonv Appahatus ok Gastkic Teeth or Dithyrocaris. 



See pp. 194—198. 



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

 Fig. 



1. Dextral. Coiiied iroiii ' Geul. Mae.,' 1SG5. pi. xi, Al'. 3 41 ^ i j /^ rn i- u t « 



2 ' " fi.f •■! I.Urchard C^uarrv, Ihornliebank, four 



o' " " £■'' o I miles from Glasgow, Eeut'rewshire. 



3. „ „ fig. 3 a) ° ' 



4. Dextral ,, „ fig. 4 "I t -ht • • n 



r ' " „° , ^ Lower Marine series, Campsie. 



^- Dextral „ „ fig. 5 1 Orchard Quarry, Thornliebank. 



7. „ „ fig-5«J 



8. Both Dextral and .Sinistral, hut not distinct. Copied from ' Geol. Mag.,' 1S65, pi. xi, fig. S. 



Lickprivick Quarr_v, two miles south-we.'t of East Kilbride. 

 9.1 Sinistral. Museum Geoloyieal Survey of Scotland, Ko. 5, FV^. Lower Limestone Group. 

 10./ Cowden's Quarry, Dunfermline. 



ll.lSini.stral. Museum Geological Survey of Scotland, No. 2, FV. Lower Limestone Group. 

 12.J Dolly (Quarry, Druml'ord, Duuferiidine. 



IS.lDextral > 



14. ((Base of the tooth ironstone) _„ ^-,. ^ i jn t> ^ i.- 



-' J-British Museum, jso. 32, ij9,7/6. Orchard Quarry, Kenirewsnire. 



15-]. Dextral J 



16. f 



17.1 ^''I'stral. British ^luseum, No. 33, I. 754. Orchard Quarry, Renfrewshire. 



ly. f (Base of tooth ironstone.) 



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



^Dunn Collection, marked C. 12. Eedesdale. 



19.) Dextral. British Museum, No. 31, 

 20. 1 (Base of tooth slightly calcareous.) 



21. Dextral \ 



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



23.\Sinistral 



24. [(Calcareous hasc) 



gyjsinistral 



27. Dextral ] 



28 (?). VNeilson Collection, marked L. Orchard Quarrv, Eeufrewshire. 



29. SiuistralJ 



30.1 Dextral. Neilsou Collection, marked K. East Kilbride. 



31. I (Calcareous base.) 



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



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

 34.1 Cock-ot'-Arran Upper Limestone series. 



35 ) 



.,(.' ^Sinistral. Dunn Collection, marked C. 12. Eedesdale. 



!^y; I Dextral ^ 



39 ) 



4y;|Dextral 



Neilsou Collection, marked L. Orchard Quarry, Eeufrewshire. 



41. Sinistral 



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



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



41. Both; sinistral lying on the dextral tooth. Mus. Pract. Geol., G2G4. Tyrone or Londonderry. 



