44.2 Mr. T. Davidson on Lamarck’s species of 
38. Terebratula tetraédra (Sow. M. C. tab. 83. fig. 4). 
Obs. The specimens attributed to this species in° Lamarck’s 
collection do not belong to Sowerby’s type, but to that beautiful 
and well-characterized species known under the name of Tere- 
bratula decorata, Schloth., so admirably illustrated and described 
by M. Le Vicomte D’Archiac in the ‘ Mém. de la Soc. Géolo- 
gique de France,’ and also well represented in pl. 244. fig. 2. of 
the ‘ Encyclopédie Méthodique.’? Lamarck, singular to say, had 
in his collection specimens of Sowerby’s type, but which he 
places in his Terebratula spathica. 
39. Terebratula plicata, Val. in Lamk. PI. XIV. fig. 39. 
T. testa subtetraédra, subgibbosa, plicata, non sinuata: 5 vel 6 costis 
ab umbone obtusis, et ad marginem angulatis: nate brevi. 
Obs. Lamarck or Valenciennes refers to the ‘Encyc. Métho- 
dique,’ pl. 243. fig. 11 and pl. 244. fig. 1, and states that his 
species approaches the preceding one : but the absence of a sinus 
forcibly distinguishes it. This species is well characterized, 
and seems to belong to the liasic beds of the north of Italy. 
There exist, besides the two specimens described by M. Valen- 
ciennes, in the Garden of Plants, a number of fine specimens from 
the collection of the Marquis de Drée. In B. Delessert’s collec- 
tion we also find two specimens labeled Terebratula plicata var., 
which however belong to the Jnoceramus sulcatus and to the 
Pecten quinquecostatus. Lamarck’s Terebratula plicata being a 
good species should be retamed. Mr. Buckman was not aware 
of Lamarck’s priority when he attached a similar name to 
another species. M. D’Orbigny in his ‘ Prodrome’ has given 
to Mr. Buckman’s shell the name of Terebratula subplicatella, 
D’Orb. 1847, which however he had no right to do according 
to his views, because Lamarck’s species not being a true type 
of the genus Terebratula, would be placed by him in the genus 
Hemithyris or some other of his proposed genera, while Mr. Buck- 
man’s Ter. plicata might then remain in the Terebratulas. La- 
marck’s species varies in the number of plaits on the mesial fold ; 
some specimens present four plaits, others five, and in a few spe- 
cimens two plaits unite into one towards the margin of the shell. 
40. Terebratula canalifera, Val. in Lamk. Pl. XIV. fig. 40. 
T. testa trigonata, gibba, longitudinaliter sulcata, sinuata, cardine 
recto : nate declivi. 
Obs. The Terebratula canalifera of Lamarck belongs to the 
genus Spirifer, and reference is made to pl. 244. fig. 4, 5 and 6. 
of the ‘ Encyclopédie Méthodique :’ fig. 5, which appears to be 
the type, and is a well-known Devonian species from Paffrath 
