Fossil Terebratule. 437 
20. Terebratula deltoidea, Val. in Lamk. Pl. XIII. fig. 20. 
7’. testa compressa, transversim dilatata, triangulari, levi, margine 
supero recto in medio sinuato. 
Obs. This species was first figured and described by Fabio 
Colonna (1616) under the name of Anomya diphya, which name 
must be preserved. It subsequently received the following names: 
Terebratula triquetra in 1811 from Parkinson, Ter. deltoidea in 
1819 from Lamarck, and Ter. Antinomya from Sig. Catullo. It 
is only within the last few years that geologists are agreed as to 
its geological position, which is the middle jurassic beds or Ter- 
rain Callovien of M. D’Orbigny (Italy and Porte-de-France near 
Grenoble): it differs from a similarly shaped shell described under 
the name of Terebratula diphya by M. le Baron D’Hombre Fir- 
mas, said to be from the Neocomian beds of Gigondas ; and sub- 
sequently distinguished and figured by M. D’Orbigny under the 
name of Terebratula diphoides, ‘ Pal. Frang. Ter. Crétacés,’ vol. iv. 
p- 87. pl. 509. The specimen in B. Delessert’s collection be- 
longs to the Ter. diphya, and would appear to have come from 
Italy. Figures are given in the ‘ Encycl. Méthodique.’ This 
species has also received several other names. 
21. Terebratula Triangulus, Val. in Lamk. PI. XIII. fig. 21. 
T. testa longitudinaliter elongata, triangulari, levi: valvainferiore in 
superiorem reflexa, ad marginem sulco impresso. 
Obs. M. D’Orbigny in his ‘ Prodrome’ adopts the name Te- 
rebratula triquetra, Parkinson, ‘ Organic Remains,’ vol. ui. pl. 16. 
fig. 8 (1811), a name given likewise by that author to Terebratula 
diphya, and both belong to the same beds and localities. Sub- 
sequently Sig. Catullo named it Terebratula mutica, but which, 
with Lamarck’s, must be added to the synonyms. 
22. Terebratula Cor, Val. in Lamk. PI. XV. fig. 22. 
T. testa cordiformi subglobosa, sinu valde exarata, striis tenerrimis 
decussatis. 
Obs. No reference to figure, locality or age is given by La- 
marck, so that much doubt rested on this species until M. Valen- 
ciennes found in the collection of the Garden of Plants the type 
specimen, which he forwarded to me, and of which an exact figure 
will be found in Plate XV. As will be seen at once, this species 
is the same as M. Valenciennes’ and Lamarck’s Terebratula nu- 
mismalis, No.17. One of the two must be placed among the 
synonyms ; the specimen which served as the type has exactly 
the form of a heart, but this is only an accidental shape of the 
species. It belongs to the lias, and is abundantly found at Vieux 
Pont in Normandy, and in many other places. 
