On the Internal Structure of Terebratula pectunculoides. 449 
pl. 246. fig. 1 a, b, but on inspecting that figure, one might be 
led to consider that the species must be either Terebratula acu- 
minata or Ter. Meyendorfiit, De Verneuil, Geol. of Russia. How- 
ever, we find in B. Delessert’s collection a specimen of Ter. acu- 
minata with that name written by Lamarck, to which he added 
(“non décrit”). Ina letter I lately received from M. Valenciennes, 
the criginal describer of the species, he distinctly states that his 
Ter. spirifera is the same shell as that subsequently described 
and figured by Sowerby in the ‘M. C.’ under the name of Syi- 
rifer striatus, which he proves by sending me the original speci- 
men given to him in 1817, when in London, by the author of 
the ‘Mineral Conchology,’ a restored figure of which I give in 
my Pl. XV., M. Valenciennes’ specimen being much broken and 
mceomplete. It is, as every one knows, a common carboniferous 
shell in many countries, and has also received many names. 
Sowerby published it in 1821, and M. Valenciennes in 1819; but 
I do not know how far the last-mentioned author’s species would 
have a right to priority over Sowerby’s, on account of the false 
reference given to quite another shell in the ‘Ency. Méth’ It 
is however certain, from the type specimen before me, as well as 
from the Latin description, “ transverse dilatata, spiris,” that the 
describer had in view the same shell described afterwards under 
the name of Spirifer striatus. M. Deshayes, in his new edition 
of Lamarck, was led naturally into the mistake, as any one would 
have been. He states that “ this species is the same as Ter. acu- 
minata of Martin and Sowerby, and the figure referred to in the 
‘ Ency. Méth.’ would lead one to believe so; but as it is very bad, 
and only inexactly represents Ter. acuminata, it has not prevented 
me adding here the species intended.” 
XXXVIII.— On the Internal Structure of Terebratula pectuncu- 
loides, Schl., Terebratula pulchella, Nils., and Terebratula 
Deslongchampsii, nob. By Tuomas Davinson, Esq. 
[With a Plate. ] 
As my intentions are to publish shortly some views relating to 
the internal calcareous support of the ciliated arms in Terebratula 
and allied genera, I have simply given in Pl. XV. illustrations of 
two of these supports, hitherto unfigured. 
Fig. 4. Pl. XV. represents Ter. pulchella, Nils., and its internal 
calcareous loop, from a specimen derived from the chalk of Bel- 
gium, now in the cabinet of M. Deslongchamps. 
Fig. 5. Pl. XV. represents Ter. pectunculoides (Schl.) and its 
internal calcareous support considerably enlarged, from two spe: 
Ann. & Mag. N. Hist. Ser. 2. Vol. v. 
