Mr. T. Davidson on French Liasic Spirifers. 267 



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



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



limestone of Sedgley. 



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



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



B. of larger one. 



— 15. \5ab. Do. Deslongchampsii, Day. Lias of Normandy. 



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



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



— \7 a. Do. do. ; interior of smaller valve. 



— 18. Do. caput serpentis ; exterior. 



— 18 «. Do. do. ; interior of smaller valve, 



Plate XIV. 



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



— 2. 2 a. Do. spharoidalis, Sow. Inferior Oolite, St. Maixent 



(France). 



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



mandy. 



— 4. Aa,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. 

 "" ~ ' ; enlarged. 



; nat. size ; a British specimen. 

 ; the same, enlarged. 



; the largest specimen known from the Lias. 



D'Orb. Great Oolite, Ranville near Caen. 



; enlarged illustration of Ilminster specimen. 



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



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



Plate XV. 



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



— 2. Spirifer Tessoni. Lias, May. 



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



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



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



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



— 7. 7 di b. Do. do. From Fontaine-etoupe-four. 



— 8. 8 a, 6. Do. Munsteri, Dav, Lias, France. 



— 9. 9 a. Do. do. Lias, France. 



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



— 11. 11a, 6. /Spm/er ro5^ra^M5, Schl. ; a malformation in M. Deslong- 



champs' collection. 



18* 



