448 Mr. T. Davidson o?i Lamarck's species of Fossil Terebratula}. 



figured in my plate ; besides other specimens of a Neocomian 

 species labelled Ter. granulosa var., a figure of which I have also 

 given ; and in the collection of the Garden of Plants, besides these 

 last-named shells, we find a specimen of Terebratula spinosa and 

 varians : it is therefore evident that this species must be can- 

 celled from the nomenclature, since none of the species therein 

 placed could claim a preference. 



56. Terebratula Articulus, Val. in Lamk. PI. XIV. fig. 56. 



T. testa trigona, depressa, tenerrime longitudinaliter striata : margine 

 supero angulato : nate brevi. 



Obs. No reference is given, except that the specimen is in the 

 museum of the Garden of Plants, where I found it, and that it is 

 from the Dep. of the Sarthe. " The smooth surface of this spe- 

 cies (adds Lamarck) and its deeply angular front give to it the 

 aspect of the articulation of a shell f but on examining his spe- 

 cimen, as can be seen by the figure, it has some characters of 

 M. Richard's Terebratula Cynocephala and furcillata, as the 

 greater half of the valves from the beak and umbo are orna- 

 mented by numerous small longitudinal striae which do not ex- 

 tend to the margin of the shell ; it belongs probably to the lias 

 deposits, and I have never seen but the one specimen on which 

 the species was established. 



57. Terebratula radiata, Val. in Lamk. PI. XIV. fig. 27. 



T. testa subdepressa, inferius coarctata, superne dilatata, rotundata, 

 sulcis longitudinalibus radiatis, margine subflexuosa. 

 Obs. No reference is given by Lamarck, except that the spe- 

 cimens are in the museum of the Garden of Plants, where I found 

 them. It is probably a Neocomian shell, at least the specimen 

 which I consider the type, and which I draw in my plate. It ap- 

 proaches in form to Rhynchonella paucicosta, D'Orb. Pal. Franc, 

 pi. 494. fig. 1, 5. 



58. Terebratula pumila, Lamarck. PI. XIV. fig. 58. 

 T. testa minima, compressa, valva minori complanata, sulcis longitu- 

 dinalibus radiatis : nate acuta producta. 



Obs. As M. Deshayes justly remarks in his new edition of La- 

 marck, this species belongs to the Tliecidea radiata (Defrance), 

 and not to the Magas pumilus of Sowerby. Several specimens are 

 to be seen both in M. Delessert's collection and in that of the 

 Garden of Plants, which are derived from the chalk of Maestricht. 



59. Terebratula spirifera, Val. in Lamk. PI. XV. fig. 59. 

 T. testa trigonata, transverse dilatata, spiris ad latera decurrentibus 

 instructa, margine supero angulata : nate brevi perforata. 

 Obs. Lamarck refers to the f Encyclopedic Methodique/ 



