202 PEOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



35. Sph^bium coexeum (Linn.). 



Cyclas cornea, Linn. : S. V. "Wood, Crag Moll., vol. ii, p. 107, 

 pi. xi, fig. 2. 



Form, and Loc. — JSTorwich. Crag : Norwich ; Bramerton Common ; 

 Thorpe, JN'orfolk ; Bulchamp. 



A very rare form in the Crag, though extremely abundant in beds 

 of later age. Its earliest recorded appearance on the continent is in 

 the middle pleistocene near Potsdam. It is a common fossil in the 

 upper pleistocene of the valley of the Somme. 



36. PiSIDIUM AMNICUM (Miill.). 



Pisidium amnicum, Miill. : S. V. Wood, Crag Moll., vol. ii, p. 109, 

 pi. xi, fig. 1. 



Form, and Loc. — J^orwich Crag : Bramerton Common ; Thorpe, 

 Norfolk ; Bulchamp ; Southwold (S. V. Wood) ; Beccles (W. M. 

 Crowfoot). 



All the examples we have seen are small, and fall far short of the 

 dimensions to which this form attained during pleistocene times. 

 Alfred & Bobert Bell have recorded^ P. amnicum, var. sulcatum 

 ( = P. astartoides, Sandb.), from the "Upper Crag" ( = Eed Crag 

 of Butley and Norwich Crag), but we have been unable to confirm 

 this. It should be noted that the examples figured by AVood are from 

 the pleistocene of Grrays. P. amnicum is recorded by Dr. J. Lorie * 

 from a boring at Gorkum, Holland, at depths of 92, 94-5, 103-5, 

 108*5, and 120 metres, all being of pliocene age. It is also known 

 from the upper pliocene of Bligny, near Dijon, Prance. 



37. Pisidium eontinale (Drap.). 



Form, and Loc. — Norwich Crag : Bramerton Common (Norwich 

 Museum). 



Two valves only of this species are all that we have seen, and it 

 has hitherto been unrecorded from the English pliocene beds, whilst 

 on the continent it has not been detected in any deposit of that age, 

 its earliest appearance being in the lower pleistocene of Mosbach. 



38. Pisidium pitsillum (Gmel.), 



Form, and Loc. — Norwich Crag : Bramerton Common (Norwich 

 Museum). 



The examples found by Mr. Eeeve are the only ones known of 

 pliocene age. It first makes its appearance on the continent in the 

 middle pleistocene of Cannstadt. 



A. & R. Bell. " On the English Crags" : Proc. Geol. Assoc, vol. ii (1872), p. 215. 

 " Coutrib. a la Geol. des Pays Bas" : Arch. Musee Teyler., ser. ii, vol. ii, p. 16:j. 



