438 Mr. T. Davidson on Lamarck's species of 



23. Terebratula birostris, Val. in Lamk. PL XIII. fig. 23. 



T. testa subglobosa, subrotunda, lsevi, superne subcoarctata, medio 

 sinuata, ad sinum duobus angulis : margine non plicato. 



Obs. Only one crushed specimen is to be seen in B. Delessert's 

 collection, without any other indication but the name written by 

 Lamarck. On minute comparisons I believe it is the same as 

 Terebratula grandis of Blumenbach, a tertiary shell from Malta : 

 the specimen however is in such bad condition that one can 

 hardly judge of its exact form. 



24. Terebratula Ampulla (Brocchi, Conchologia Fossile Milan, 

 tab. 10. fig. 5). 



Obs. A very fine specimen of this species exists in the collec- 

 tion of the museum of the Garden of Plants, and a similar one in 

 that of the British Museum ; it is a tertiary species found at San 

 Geminiano in the Piacentino, &c. The loop was short, as can be 

 seen in a very fine specimen in M. Deshayes' collection. 



25. Terebratula carinata, Val. in Lamk. PL XIII. .fig. 25. 



T. testa subquadrangulari laevi ; valva inferiore subcomplanata, supe- 

 riore diedra, medio carinata. 



Obs. A few years ago Mr. Morris called attention to this spe- 

 cies, which was confounded with Sowerby's Terebratula resupi- 

 nata, M. C. tab. 150. fig. 3, 4, 1818, and which hitherto appears 

 principally characteristic of the liasic period. The Ter. carinata 

 of Lamarck has not that I am aware been found in the lias beds, 

 but is an oolitic species distinct by its foramen, and of a much 

 flatter and more elongated form. There are many varieties in 

 the resupinata group, which I hope to figure and describe shortly 

 in my monograph of British Fossil Brachiopoda for the Palseon- 

 tographical Society. I was not able to find the type specimen of 

 this species in Paris, and have therefore figured a well-charac- 

 terized specimen from the oolite beds near Caen. 



26. Te?-ebratula concava, Val. in Lamk. PL XIII. fig. 16. 



r T. testa parva : valva inferiore plana, superiore majore concava striis 

 concentricis. 



Obs. Lamarck states this species to be small, white, with a 

 ventral valve flattened, and a very convex dorsal one : locality 

 Meudon. No other cretaceous species from that locality would 

 answer the above description except Magas pumilus of Sow. In 

 Lamarck's collection however we find a small shell which answers 

 the above description, except in colour, ticketed by Lamarck Ter. 

 pumila, and the only specimen that I could find ; but it belongs 

 to quite another species, being the well-known Oxford clay Tere- 



