52 PLIOCENE MOLLUSCA. 



still more from those given under that name by F. E. Edwards in his Monograph 

 on the Eocene Mollusca. I do not think it can be referred to that species. 



V. suturalis is only known in situ from the Lower Oligocene. The shell here 

 figured may be regarded, I think, as a variety of that species. It is no doubt 

 derivative in the Crag. 



It was found in 1880 by Mr. Keeping in the Oligocene beds of Hampshire and 

 the Isle of Wight. 



Genus ANCILLA, Lamarck, 1799. 

 Ancilla Nysti, sp. nov. Plate XII, figs. 32, 33. 



1843. Ancillaria obsoleta, Nyst, Coq. foss. Terr. Tert. Belg., p. 600, pi. xlv, fig. 10. 

 1874-. Ancillaria obsoleta, Van den Broeck, Ann. Soc. Malac. Belg., vol. ix, p. 13e5. 

 1912. Ancillaria obsoleta, Tesch, Med. v. d. Eijks. v. Delfstoffeu, pt. iv, p. 86. 



Dimensions. — L. 15 mm. B. G mm. 



Distribution. — Not known living. 



Fossil: Waltonian Crag: Little Oakley (derivative). Miocene: 

 Belgium; Holland. Scaldisien : Holland (derivative). 



BemarJcs. — The little fossil here figured, obtained at Oakley, appears to corre- 

 spond with that described by Nyst from the Belgian Miocene under the name of 

 Ancillaria obsoleta, which M. van den Broeck says is very common in the zone d 

 Panopgna Menardi of Antwerp, and has been met with in great abundance by Dr. 

 Tesch in the Miocene deposits of the Dutch borings ; the latter has also found a 

 few similar specimens in the Scaldisien of Holland, which with the Oakley shell 

 are no doubt derivative from some Miocene beds existing in Pliocene times in 

 the Anglo-Belgian basin. Prof. Sacco, to whom I have submitted my fossils, 

 thinks, however, that they cannot be correctly referred to Brocchi's species 

 Buccinum obsoletiim, even as a variety, nor to any other Italian form known to 

 him, and considers I should describe them as something new, a proposal with 

 which M. Cossmann agrees, suggesting the appropriate name of the distinguished 

 Belgian Palseontologist who originally called attention to the subject. 



Unfortunately my photograph of the Oakley fossil (PI. XII, fig. 32) does not 

 correctly represent the actual form of the mouth. The apparent excavation of 

 the upper part of the columella was due to a portion of the hardened matrix 

 adherent to it, which has since been removed. 



Dr. Tesch informs me he has a thousand specimens of this form from the 

 Miocene deposits of Belgium and Holland. 



