436 Mr. T. Davidson on Lamarck’s species of 
Geol. Soc., Nov. 1846, it was attributed to Terebratula ovalis, 
Lamk., by mistake. Lamarck’s var. 6. does not belong to the 
same species or epoch ; it is a young specimen of some oolitic 
species, and is stated to come from Saturnin near Domfront, dép. 
de la Sarthe. 
Both the species and variety may be seen in B. Delessert’s col- 
lection, and I may here state that every time I mention B. De- 
lessert’s collection, I mean that part belonging to Lamarck’s 
series. 
16. Terebratula ovalis, Val. in Lamk. PI. XIII. fig. 16. 
T. testa ovali, transversim et superne dilatata, striis concentricis leeyi- 
bus : nate incurva. 
Obs. This species is quite distinct from Terebratula depressa, 
and is from the white jura or coral rag of Wurtemberg. Mr. 
Waterhouse showed me several young specimens referable to this 
species in the collection of the British Museum. In B. Deles- 
sert’s collection. 
17. Terebratula numismalis, Val. in Lamk. Pl. XIII. fig. 17. 
T’. testa subrotunda, leevi, utraque valva superne sinu instructa : striis 
concentricis remotis: nate brevi: foramine minimo. 
Obs. This species is well known, has often been described and 
figured, and requires therefore no further remarks, except that I 
could not find the type specimen in the Paris collections ; but as 
reference is made to tab. 240. fig. 1 a, b, of the ‘ Encyclopédie 
Méthodique’ by Lamarck, no doubts can exist. I have therefore 
figured here a magnificent specimen of the species from the liasic 
beds of Normandy belonging to M. Deslongchamps. Ter. Cor, 
No. 22, is merely a bilobate variety of this species. 
18. Terebratula umbonella, Val. in Lamk. PI. XIII. fig. 18. 
T. testa elongata turgida, transversim compressa, supra obtusa, levi : 
umbonibus pre-elevatis : nate incurva. 
Obs. This species has a strong resemblance to Terebratula 
lagenalis, Schloth., 1820; one specimen shows the deltidial area, 
while in others the umbo of the ventral valve touches the beak ; 
this is visible in our English specimens of lagenalis; it was 
figured in the ‘Encyclopédie Méthodique,’ pl. 240. fig. 3, but 
the characters of the species are not well represented. Six spe- 
cimens are to be seen in B. Delessert’s collection; and on a 
ticket written by M. Menard we find, “de Montigny, commune 
de Mont-Bizol sur la Sarthe, a trois lieues de Mans.” 
19. Terebratula digona (Sow. M. C. tab. 96. fig. 1. 5). 
Obs. Seyeral specimens are to be seen in B. Delessert’s col- 
lection. 
