438 Mr. T. Davidson on Lamarck^s species of 



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



T. testa subglobosa, subrotunda, lae\d, superne subcoarctata, medio 

 sinuata, ad sinum duobus angulis : margine non plicato. 



Obs. Only one crusbed 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 Isevi ; 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. Terebratula concava, Val. in Lamk. PL XIII. fig. 16. 



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 locahty 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- 



