ALLUVIUM AT WALTHAMSTOVV, l-SSKX. 



15 



5 



4 

 I 



I 



)> 



example. 



The hand formulae of the examples of Helix nemovalis are :■ 



^ 2 3 (4 5), 6 examples 



(I 2 3) (4 5), 



123 45, 



(I 2) 3 (4 5), 



000 00, 



In the Lockwood reservoir at one spot close to the main 



stream was a sandy deposit, obviously quite modern, containing 



a large number of non-marine shells, as well as examples of 



Ostvea editlis and Biiccinuui nndatum. We were informed by Mr. 



Traill that a mill formerly stood near this spot. The species 



found are thirty-six in number, viz : — 



Pyvainidiila votundata (Mull.) 

 Helicella cantiana (Miill.) 

 Hygromia hispida (Linn.) 

 Vallonia pnlchella (Miill.) 

 Helicigona avhiistovuni{lL,\\-\ n .) 

 Helix neinoi'iilis, Linn. 

 Siicciiiea put vis (Linn.) 

 ,, elegaiis, Risso. 

 A ncyliis fluviatilis (Mull.) 

 Limnoca pevegev (Miill.) 



auyicidavia (Linn.) 

 tvuncatula (Miill.) 

 palustvis (M\\\\.) 

 stagtialis (Linn.) 

 Planovhis covneus (Linn.) 

 albus, Miill. 

 styoeiniij West. 

 caviuatns (Miill.) 



J) 



5? 



55 



»J 



5) 



>5 



5J 



3J 



5) 



J) 



Planovhis mavginatus, Drap. 

 nautileus (Linn.) 

 TO vie X (Linn.) 

 contovtus (Linn.) 

 PJu/sa fontinalis (Linn.) 

 Bithyuia tentaculata (Linn.) 



„ leachii (Shepp.) 

 Vivipava vivipara (Linn.) 

 Valvat.i piscinalis (Miill.) 

 Nevitina fluviatilis (Linn.) 

 Unio tumidics, Ketz. 

 ,, pictoruui (Linn.) 

 Anodonta cygnaa (Linn.) 

 Sphaviuni vivicola (Leach.) 

 ,, coy Ileum (Linn.) 

 „ lacustye (Miill.) 

 Pisidiuui amnicuvi (Miill.) 



supinum (A. Schm.) 



>» 



The band formulas of the examples of Helix uemoyalis are :— 

 I 2 3 (4 5), I e.xample. 



(I 

 (I 



(2 



2) 



2) 

 2 



3) (4 



3 4 



3 (4 



3 4 



5), 



5), 

 5, 



I 

 I 

 I 



j» 



)» 



5J 



5 examples. 



Many other samples of modern deposits from other spots 

 were examined, but they yielded no fresh species. 



As we have already stated, far more attention was paid to the 

 Shell-marl than to the other deposits. The patches varied in 



