KENIfARD & WOODWARD : BRITISn PLIOCENE NON-MAKINE MOLLUSCA. 203 



We have thus a total of thirty-eight species. Of these, two forms, 

 Pyramidula Suttonensis and Clausilia pliocena, sxe only known from 

 the Coralline Crag. There are six species which are recorded from the 

 lied Crag only. Of these one, Pyramidula rysa, is extinct ; four are 

 no longer found in this country, though living on the continent, viz., 

 Eulota fruticum, Hygromia incarnata, Selicodontalens, and JTe& laetea; 

 whilst one, CochUcopa luhrica, is still a common form in this country. 

 Of the fourteen species common to both the Red and the Norwich Crags, 

 one only, Vivipara media, is extinct ; one other, Corhicida Jluminalis, 

 is no longer British ; but the remaining twelve are still resident with 

 us, viz.,' Hygromia hispida, Vallonia pulchella, Helicigona arhustoriim, 

 Pupa muscorum, Succinea putris, Paludestrina stagnalis, P. ventrosa, 

 Limncea palustris, L. pereger^ L. trimcaiula, Planorhis marginatus, 

 and P. spirorbis. Of the sixteen species known only from the 

 Norwich Crag two are extinct, Paludentrina Reevei and Vivipara 

 glacialis ; one, Hygromia ruh'ginosa, is extinct in this country, though 

 living on the continent ; the remainder are all British, viz., Sphyradium 

 edentulum, Pupa cylindracea, Succinea elegans^ 8. ohlonga, Bythinia 

 tcntaculata, Limncea auricularia, Planorhis corneus, Valvata cristata, 

 V. piscinalis, Pisidium wmnicum, P. pusillum, P. fontinale, and 

 Sphmrium corneum. 



Twelve recorded species are rejected by us, viz. : — 



Planorlis vortex (Linn.), first given by Lyell (2), and afterwards by 



Wood (3). This is probably an error for P. spirorbis. 



jincylus lacusf.ris, Miill. ^ . n t i -l a ij? i d t. i j_ 



•^ All recorded by Alfred & Kobert 



Bell (12), but no examples have 



- been traced, and it should benoted 



that L. stagnalis was originally 



given with a query. 



Limncea stagnalis (Linn.). 



Planorhis albus, Miill. 



Pisidium astartoides, Sandb. 



(= in part P. amnicutu, var. 



sulcatum). 



Vivipara vivipara (Linn.). ^ 



Limncea elodes. Say. -n, i. j. n j. -,r.r^ 

 WnlimN.- iM-nll \ ^«i' reasons stated ante, p. 196. 



Solhollii, Moll. 

 Pingelii, Moll. 



Carychium minimum, Miill., was first cited by Prestwich, and the 

 specimen stated to be in the Norwich Museum, but it cannot be 

 traced. 



Assiminea Grayana, Leach, though listed and figured by Wood (Crag 

 Moll., Suppt. II, p. 35, pi. iii, fig. 18), is admitted by him to be 

 doubtful, and the specimen cannot now be traced. 



Unio tumidus, Retz. : Wood states (Crag Moll., Suppt. I, p. 118) 

 that in 1864 he found an imperfect specimen of Ilnio at 

 Bramerton, which appeared to resemble U. tumidus. Since we 

 have also failed to trace this specimen it is advisable to delete it 

 from the list. The three valves of this species formerly on view 

 in the Natural History Museum and labelled " Red Crag : 

 Sutton" are obviously not pliocene fossils at all, as also is the' 

 case with the example of Pyramidula rotundata (Miill.) in the 

 Robert Bell Collection labelled "Coralline? Crag: Boyton," and 

 ■ still retaining some of its coloration. 

 VOL. in, — MARCH, 1899. 14 



