258 Mr. T. Davidson's Notes and Descriptions 



Terebrirostra Bargesana, P'Orb. PI. XIV. fig. 5. 



T. Bargesana^ D'Orb. 1851, Journal de Conchyliologie, vol. ii. 

 p. 225. pi. 4. fig. 2-5. 



Diagnosis. Shell inequivalve, much elongated; beak prolonged, 

 tapering and truncated by a circular foramen ; area long, tri- 

 angular and edged; deltidium narrow, partly surrounding the 

 foramen; valves unequally convex, the largest most so; no 

 mesial fold or sinus, a slight depression existing towards the 

 margin of the smaller valve. Surface ornamented by a number 

 of small rounded costse rarely bifurcated, but augmenting by the 

 intercalation of costse at variable distances from the beak and 

 umbo. Surface punctuated. Length 12, width 9, depth 7 lines. 



Obs. Eight specimens of this shell are preserved in the col- 

 lection of the British Museum, which we have considered identi- 

 cal with M. D'Orbigny's lately described species, not having been 

 able to detect any distinctive character, except its smaller dimen- 

 sions, which may be due to local circumstances. The larger valve 

 exceeds the smaller one by one-fourth more in length, arising 

 from the elongation of the beak, but in younger shells the dis- 

 proportion is much less. 



T. Bargesana is found in the Upper Cretaceous beds of San- 

 tander (Spain), associated with T. Verneuiliana. In France it 

 was first discovered by the Abbe Barges between Bedoule and 

 Cassis (Bouches-du-Rhone) . 



Plate XIV. fig. 5. From a specimen in the British Museum. 



5. On French Liasic Thecidese. 



Prior to the publication of my Monograph of British Liasic 

 and Oolitic Brachiopoda in 1851, no Thecidece had been noticed 

 in the Lias ; M. D'Orbigny does not mention any. In the work 

 alluded to we described and figured four, found by Mr. Moore 

 in the neighbourhood of Ilminster ; viz. Th. Mooreij Bouchardii, 

 rustica, and triangularis, this last being likewise common to the 

 Inferior and Great Oolite. In the Lias of Normandy two forms 

 have occurred; one is our Th. Bouchardii; the other, probably 

 new, was lately found along with Spirifer Tessoni at May near 

 Caen by M. Deslongchamps, who forwarded several specimens 

 for my examination and publication. 



Thecidea Deslongchampsit, Dav. 1852. PI. XIII. fig. 6, 

 7, H, 9. 



Diagnosis, Shell inequivalve, longer than wide, irregularly ob- 

 long ; fixed to submarine objects by the flattened beak of the larger 

 valve moulding itself on the object to which it is attached; the 

 remaining portion of this valve is regularly convex, and deepest 

 near the hinge; area short, wide and irregular; deltidium 



