Mr. T. Davidson on French Liasic Spirifers. 267 



Fig. 11. 11a. Rhynchonella sub-Wilsoni, D'Orb. ; exterior, nat. size. 



— 12. 12a. Do. Wilsoni, Sow.; exterior, from the Aymestry 



limestone of Sedgley. 



— 13. Do. do. ; interior of larger valve (enlarged). 



— 14. Do. do. ; internal cast, A. of smaller valve, 



B. of larger one. 



— 15. 15 a b. Do. Deslongchampsii, Dav. Lias of Normandy. 



— ] 6. Do. lacunosa, Schl. ; interior of larger valve. 



— 17- Terebratulina substriata, Schl. ; (Jurassic) exterior. 



— 17 a. Do. do. ; interior of smaller valve. 



— 18. Do. caput serpentis ; exterior. 



— 18 a. Do. do. ; interior of smaller valve. 



Plate XIV. 



Fig. 1.1a. Terebratula Haimeana, Dav. Dev., Paffrath near Cologne. 



— 2. 2 a. Do. splicer oidalis, Sow. Inferior Oolite, St. Maixent 



(France). 



— 3. 3 a, b. Do. Morierei, Deslongchamps. Inferior Oolite, Nor- 



mandy. 



— 4. 4 a, b. Terebratella Verneuiliana, Dav. (Cretaceous) Spain ; the 



line indicating the nat. size. 



— 5. 5, a. Terebrirostra Bargesana, D'Orb. (Cretaceous) Spain. 



— 6. Thecidea Deslongchampsii, Dav. ; nat. size. Lias, Normandy. 



— 6 a. Do. do. ; enlarged. 



— 7- 7 a, b, c. Thecidea Deslongchampsii ; another specimen much en- 



larged. 



— 8. Thecidea Deslongchampsii ; interior of attached valve, enlarged. 



— 9. Do. do. ; interior of smaller valve, enlarged. 



— 10. Thecidea Bouchardii, Dav. ; nat. size. Lias, Fontaine-etoupe-four. 



— 10 a. Do. do. ; enlarged. 



— 11. Do. do. ; nat. size; a British specimen. 



— 11a. Do. do. ; the same, enlarged. 



— 12. Do. do. ; the largest specimen known from the Lias. 



— 13. Do. triangularis, D'Orb. Great Oolite, Ranville near Caen. 



— 13 a. Do. do. ; enlarged illustration of Ilminster specimen. 



— 14. Spirifer rostratus (Schl.) ; a smooth var. 



— 15. Do. do. ; a var. with rounded plaits. 



Plate XV. 



Fig. 1. 1 a, b, c. Spirifer Tessoni, Dav. Lias, Fontaine-etoupe-four. 



— 2. Spirifer Tessoni. Lias, May. 



— 3. 3 a, b, c. Spirifer Signiensis, Buv. Lias, France; type of the species. 



— 4. 4 a, b. Spirifer Deslongchampsii, Dav. Lias, France. 



— 5. Spirifer oxypterus, Buv. ; type of the species. 



— 6. 6 a. Spirifer oxypterus. From Croisilles. 



— 7- 7 a, b. Do. do. From Fontaine-etoupe-four. 



— 8. 8 a, b. Do. Miinsteri, Dav. Lias, France. 



— 9. 9 a. Do. do. Lias, France. 



— 10. Spirifer Walcotti, Sow. Lias, France. 



— 11. 11 a, b. Spirifer rostratus, Schl. ; a malformation in M. Deslong- 



champs' collection. 



18* 



