PLATE II.— (Univalves). 



Fig. 



Species tt- Authofity 



Colouring. 



Chief Characteristics. 



Habitat 



Frequency 



17 



Amphipeplea 

 glutinosa (Bnig. ). 



Pale horn colour 



Extreme thinness, 

 glossiness, mantle 

 covers young sliells 



Lakes and ponds 



Local 



18 

 19 



Limniea involuta 

 (Tlioiiipsoii) 



— truncatula 



(Miiller) 



Pale amber 

 Greyisli horn color 



Intorted spire. Only 

 one habitat known 



Small size, turreted 

 spire 



Lake on Croma- 

 glaun Mountain 

 near Killarney 



Shallow water, on 

 nmd 



Very rare 

 Common 



20 



— glabra (Miiller) 



Ditto 



Long tapering spire, 

 glossiness 



Ditches and ponds 



Local 



21 



Physa fontinalis 



(Liiine) 



Horn colour 



Sinistral, short blunt 

 spire 



Streams, canals, 

 etc. 



Common 



22 



Aplexa hypnorum 

 (Linne) 



Dark reddisli horn 

 colour 



Sinistral, spindle shape 



Ditches, streams, 

 etc. 



Local 



28 



Physa hetero- 



stropha (Say) 



Reddish horn 



colour 



Globoseness, sinistral 

 (introduced) 



Canals and reser- 

 voirs 



Rare 



24 



— acuta (Drap.). 



Pale horn colour 



Pointed spire, sinistral 

 (introduced) 



Water tanks, 

 Kew, etc. 



Rare 



2,". 



Ancylus fluviatilis 



(Miiller) 



Yellowish grey 



Limpet shape 



Running water on 

 stones 



Common 



26 



Velletia lacustris 



(l.iiiiie) 



Greyish horn 



colour 



Long shape, twisted 

 apex 



Ditches, marshes, 

 on water plants 



Frequent 



27 



Neritina fluviatilis 



(Linne) 



Whittled, often 



banded 



Solidity, orange colored 

 hinged operculum 



Running or still 

 water, on stones 



Frequent 



28 



Paludestrina similis 

 (Draparnau(l) 



Horn colour 



Operculum. Short 

 spire, swollen whorls 



Thames marshes 

 near Woolwich 



Veiy rare 



29 



— ventrosa 



(Montagu) 



Pale horn colour 



Operculum. Long 

 tapering spire 



Brackish marshes 



Local 



30 



— taylori (Smith) 



Yellowish horn 



colour 



Operculum. Blunt 

 spire, rounded whorls 



Canals and 

 marshy lands 



Rare 



31 



— jenkinsi (Smith) 



Pale horn colour 



Operculum. Tapering- 

 spire, often keeled 



Ditches, streams, 

 etc. 



Frequent 



32 



— stagtialis(Baster) 



Yellowish or 



reddish 



Operculum. Cone 

 shape, solidity 



Brackish marshes 

 close to sea 



Common 



33 



Valvata cristata 



(Miiller) 



Pale horn colour 



Operculuu). Planorbis 

 sliape 



Ditches, canals, 

 etc. 



Frequent 



34 



— piscinalis 



(Miiller) 



Brownish yellow 



Operculum. Circular 

 mouth, rounded whorls 



Ditto 



Common 



35 



Bithynia tentacu- 

 lata (Linne) 



Horn colour, often 

 golden 



Operculum. Glossi- 

 ness, transparency 



Ditches, rivers, 

 canals, etc. 



Common 



36 



— leachii (Shepp. ) 



Horn colour 



Operculum. Deep 

 suture, roundish 

 mouth, size 



Ditches, canals, 

 etc. 



Local 



37 



Vivipara vivipara 



(Linne) 



Pale green with 

 dark bands 



Operculum. Blunt 

 apex, no umbilicus 



Canals, lakes, etc. 



Common 



38 



— contecta (Millet) 



Dark green with 

 dark bands 



Operculum. Sharp 

 apex, deep suture, 

 umbilicus 



Canals, deep 

 ditches, etc. 



Frequent 



39 



Succinea putris 



(Linne) 



Amber colour ... 



Large body whorl, 

 short spire, thinness 



Amphibious, on 

 water plants 



Common 



40 



— oblonga (Drap.) 



Greenish or 



yellowish 



Small size, deep suture, 

 long spire 



Marshes, near 

 sea coast 



Rare 



41 



— elegans (Risso) 



Deep amber coloui 



• Narrow^ mouth, slender 

 shape 



■ Amphibious, on 

 water plants 



Common 



