92 ALBIAtf FOSSILS DISCOVERED AT OttEFORD FtTZPAttJE. 



upper valve showing an external surface, bending slightly upwards 

 at the ventrab margin, where it is obtusely acute ; muscular scar is 

 elongate and close to posterior border. 



Goldfuss was the first authority to indicate that Ifilsson's 

 0. lateralis from the Swedish Cretaceous was synonymous with 

 Sowerby's Cliama canaliculata, a fact generally recognised by 

 paleontologists, though Coquand saw some slight differences in 

 these shells, sufficient, as he thought, for separation purposes, but 

 which, I consider, after studying the figures and descriptions 

 referred to in the above synonomy, are not tenable. The species 

 appears to have been very gregarious, as a number of them are 

 crowded together on one piece of matrix. 



Dimensions of figured ) Height = 26 1 _ 



i T n. on [Millimetres, 



example ) Length = 20 J 



KANGE OF SPECIES. Albian to Cenomanian. 

 LOCALITIES. Folkestone, Cambridge, Blackdown, Devizes, Stoke, 

 &c. ; Gaty-Gerosodot, Ardennes, Meuse, St. Croix, &c. 



PHOLADOMYA FAVRIXA? Agassiz. 



Pholadomya Favrina, Agassiz : Etudes Critiques Mollusques 

 Fossiles (Myes), 1842, PI. 2, figs. 1-2, p. 59. 



Pholadomya Fabrina, Orbigny : Paleontologie Francaise, Terrains 

 Cretaces, Lamellibranchia, 1844, PI. 363, figs. 6-7, p. 354. 



Pholadomya Favrina, Pictet and Eoux : Desc. Moll. Foss. Gres 

 Verts Geneve, 1853, PI. 29, tig. 1, p. 403. 



Pholadomya Fabrina, de Eance : Geological Magazine, 1874, 

 p. 252. 



Two specimens, much crushed and imperfect, have been doubt- 

 fully referred to this species. The most complete one has both 

 valves in contact, but the umbonal and anterior parts are missing. 

 It is highly ornamented with numerous straight, radial costse, 

 extending obliquely from the beaks, crossed by frequent concentric 

 growth lines, which at the points of junction set up a tubercled or 

 granular appearance. This sculpturing agrees better with 

 d'Orbigny's figures than with the originals of Agassiz, these latter 



