﻿108 



GEOLOGICAL MEMOIRS. 



posed, we have as yet succeeded in determining with sufficient accu- 

 racy only the few following species : — 



1. Pholadomya regularis (D'Orb.). Allorisma regularis, King, 



Vern. Geol. Russ. vol. ii. p. 298. pi. 19. fig. 6, pi. 21. fig. 11. 



2. Pholadomya plicata (D' Or b.). Sanguinolaria plicata, Portlock. 



3. Pholadomya, sp. 



4. Cardinia tellinaria (Koninck). Unio tellinarius, Goldf. Petref. 



pi. 131. fig. 17. 



5. Cardiomorpha pristina (B'Orb.). Amphidesma pristina,Yen\. 



Geol. Russ. vol. ii. pi. 20. fig. 5. 



6. Leptsena arachnoidea (D'Orb.), Phill. sp. Orthis aracknoidea, 



Vern. Geol. Russ. vol. ii. p. 196. pi. 10. fig. 18, pi. 11. fig. 1. 



7. Productus, sp. 



8. Spirifer glaber (Sow.), Martin, sp. 



9. Ptilodictya, sp. 



10. Cyathocrinus quinquangularis, Miller. Eichw. Sil. Syst. p. 172 : 



Phillips, Geol. Yorks. p. 206. pi. 3. fig. 30-32. 



1 1 . Ceriopora irregularis (J)' Orb.) . Alveolites irregularis, Koninck, 



Carb. Belg. pi. B. f. 2 ; Michel. Zooph. pi. 60. fig. 4. 



The discovery of these most important organic remains shows that 

 we were not altogether deceived in assigning the age of the Carboni- 

 ferous period to the rock, termed by us the Vermcano, since, there 

 being some degree of uncertainty as long as fossil plants only were 

 known to be present in it, the occurrence at a higher level in the 

 same rock of animal remains, belonging to that period, removes any 

 doubt that could possibly remain on this point. This case is widely 

 different from that of the Tarentaise, because we have not here the 

 mysterious commingling of Jurassic fossils with Carboniferous plants, 

 but on the contrary we find, and that too in their normal position, 

 remains of the most characteristic species of animals of this latter 

 period. 



We have recently collected, and MM. Pitiot and G. Begni have 

 courteously favoured us with, several specimens of impressions of 

 plants from the same anthracite-bed that supplied the species above- 

 enumerated. These are — 



1. Calamites, sp. 



2. Nephropteris orbicularis, Brong., Tabl. p. 16. 



3. Odontopteris Schlotheimii, Brong. 



4. Pecopteris (Aplophlebis) acuta, Brong. 



The other plants included in our list of Tuscan fossils [Consid. 

 Geol. Strat. Toscana] are — 



5. Neuropteris rotundifolia. 



6. N. allied to N. Voltzii, Brong. 



7. N. allied to N. elegans, Brong. 



8. N. sp. 



9. Adiantites, sp. nov. 



