Fig. 



1, 



1 a. 



2. 





3, 



3 a. 



4, 



A a. 



5. 





6, 



6 a. 



7, 



la. 



8, 



9. 



SUPPLEMENT, PLATE L 



DEVONIAN. 



Spirals and loops developed by the Rev. N. Glass. 



Waldheimia (or Macandrevia) juvenis, Sow. Mid. Dev., Lummaton. (P. 13.) 



„ „ „ Dorsal valve enlarged, showing the loop. 



„ (or Macandrevia) Whidbornei, Dav. Exterior, nat. size. Mid. Dev., Lummaton. 



,, „ ,, 4 a. Dorsal valve (enlarged) showing the 



loop. 4. Nat, size. (P. 12.) 

 „ ? or Terebratula, sp. Mid. Dev., Hope's Nose, near Torquay. (P. 13.) 



Terebratula ? Newtoniensis, Dav. Mid. Dev., Lummaton. Mus. Nat. Hist, Torquay. (P. 



14.) 

 Centronella Virgo, YhWX.^s.^. 7. Nat. size. 7 a. Enlarged. Coll. of Mr. G. F. Whidborne. 

 „ „ „ 8. Dorsal aspect or back of the loop facing the bottom of 



dorsal valve. 9. Ventral aspect or loop 

 as attached to the dorsal valve. These 

 figures are enlarged. (P. 14.) 



10, 10 a, 5. Glassia Whidbornei, J)a.v. Exterior nat. size. Mid. Dev., Lummaton. Coll. of Mr. Whid- 



borne. (P. 38.) 



11, 12. „ „ „ 11. Dorsal aspect, nat. size, showing attachments and one spiral. 



12. A specimen complete, enlarged. (P. 

 38.) 



13, 13 a, 6. „ „ „ 13, Exterior, nat. size. 13 a, 6. Enlarged. Lummaton. (P. 38.) 



14, „ „ „ Another specimen showing spirals. (P. 38.) 



15, 15 a. Atrypa desquamata, Sow. Dorsal and ventral aspects showing spirals. Mid. Dev., Lum- 



maton. (P. 39.) 



16, „ reticularis, Linne. A weathered section, showing one of tlie vertical coils, Hope's 



Nose. Coll. of Mr. Whidborne. (P. 39.) 

 17,18. Bifida? HuntiifDaiV. 17. Nat. size. [7 a,b. Enlarged. 18. Backof ventral valve, enlarged. 



Mid. Dev., Lummaton. (P. 28.) 

 19, 19 a, 6. Atrypa? trigonella, Dav. Mid. Dev., Lummaton. 19, 19 a. Nat. size. 19 6, Enlarged. 



(P. 40.) 

 20,20 a. Rensselceria? striatissima,'Da.\. Mid. Dev., Hope's Nose. Coll. of Mr. Whidborne. (P. 



19.) 

 Athyris Glassii, Dav. 21. Nat. size. 21 a,b. Enlarged. Mid. Dev., Lummaton. (P. 24.) 

 ,, ,, ,, Enlarged, showing the spirals. 



„ concentrica, Buch. 23 a. Enlarged. Mid, Dev., Lummaton. 24. Spirals and 



attachments. (P. 25.) 

 „ rugata, Dav. Mid. Dev., Lummaton. (P. 26.) 

 Merista plebeia, Sow. = scalprum, Roemer. 26. Enlarged, showing spirals. 27, Spirals 



and shoe litter process seen from back 

 of ventral valve, 28. Weathered speci- 

 men, showing spiral. 29. Weathered sec- 

 tion, showing shoe lifter process. Mid. 

 Dev., Hope's Nose, Torquay. (P. 20.) 



30, 30 a, 31. Refsia longirostris, Kayser. 30. Nat. size, seen in profile. 30 a. Bit of punctate surface of 



shell enlarged. 31. Showing the spirals. 

 Mid. Dev,, Lummaton. (P. 29.) 



32, Spiriferinainsculpta,Vh\\\. Mid. Dev., Lummaton. Coll. of Mr. Whidborne. 



33, Spirifera undifera, F. Roemer. Spirals, Mid. Dev., Lummaton. (P. 33.) 



34, „ curvatu, Schloth. Spirals. (P. 32.) 



35, 36. Cyrtina Tieteroclita, Schloth. Hope's Nose, near Torquay. 36. Bit of punctured shell 



enlarged. (P. 37.) 



37, 37 a. „ „ „ Spirals and attachments. (P. 37.) 



38. ,, sp, ? „ Mid. Dev., Oarstone, near Torquay. Coll. of Mr. Whidborne. 



(P, 38.) 



21, 



21a, 



22, 





23, 



24. 



25, 



25 a. 



26- 



-29. 



