Fossil Terebratulse. 441 



form of its two plaits : one specimen is to be seen in the museum 

 of the Garden of Plants, which was found by Sig. Bonelli in the 

 tertiary beds near Turin in Italy. 



35. Terebratula quadrifida, Val. in Lamk. PI. XIV. fig. 35. 



T. testa triangulari-depressa, dilatata, laevi, superne quatuor angulis 

 acutis instructa : nate brevi. 



Obs. This is a well-known species, common to the liasic beds 

 of France and England ; one specimen only exists in Lamarck's 

 collection at B. Delessert's ; it is one of the various shapes this 

 species assumes, passing by insensible gradations into Terebra- 

 tula cornuta, Sow. : nor is it uncommon to find (as can be seen in 

 M. Deslongchamps' cabinet) specimens, one half of which is qua- 

 drifida, while the other half is cornuta : therefore Lamarck's name 

 should be kept for the species, and cornuta cancelled from the 

 nomenclature. 



36. Terebratula angulata, Val. in Lamk. PI. XIV. fig. 36. 



T. testa subtrigona, ventricosa, laevi, margine supero valde sinuato, 

 tribus angulis acutis. 



Obs. Three specimens are. to be seen in B. Delessert's collec- 

 tion, but which belong to as many species, so that it is difficult 

 to know which Lamarck intended as his type ; this however is of 

 little importance, as the name must be canceled, it having been 

 given many years before by Linnseus to a mountain limestone 

 shell differing from Lamarck's specimen. 



37. Terebratula multicarinata, Val. in Lamk. PL XIV. fig. 37. 



T. testa magna, rotundata, pectiniformi, costis numerosis carinata : 

 margine non sinuato. 



Obs. It is singular that M. D'Orbigny makes no allusion to 

 Lamarck's species, which holds priority over Baron Leopold von 

 Buch's Terebratula peregrina published long after 1834, and 

 which M. D'Orbigny adopts in his ' Paleontologie Francaise/ 

 when at a few steps from his own door he could have seen a fine 

 specimen of this species in Lamarck's collection at B. Delessert's. 

 It is one of the largest Terebratulas known, and would appear to 

 belong to the Neocomian beds of Chatillon (Drome). Lamarck's 

 type specimen, of which I give a reduced figure, measured in 

 length and breadth 3 inches and If inch in depth, but the spe- 

 cies attained much greater dimensions, as can be seen from spe- 

 cimens in the British Museum. It has been well figured by 

 M. D'Orbigny in his f Pal. Franc. Ter. Cretaces,' vol. iv. p. 493, 

 and in the \ Mem. de la Soc. Geol. de France,' vol. iii. p. 156. 

 pi. 15. fig. 28. 



