30 
LAND AND ERESH-WATEll MOLLTJSCA 
GASTROPODA. 
PEGTINIBRANC1IIA TA. 
Paludinidze. 
Bythinia tentaculata (L.).—Watford; Brett. Rivers Lea and 
Yer, in neighbourhood of Sandridge; Griffith. Ware; Jeffreys. 
B. Leachii, Shep.—Ware ; Jeffreys. 
YALVATID2E. 
Valvata piscinalis (Mull.).—Watford; Brett. River Lea near 
Sandridge ; Griffith. Ware ; Jeffreys. 
V. cristata , Mull.—Ware ; Jeffreys. 
P TJLMONOBR ANCILIA TA. 
LlMN-ElK. 
Planorbis lineatus, Walker_Ware ; Jeffreys. 
B. nitidus (Mull.). — Reservoir-stream near Radlett ; Selby. 
Watford; Brett. Ponds and ditches near River Lea, Sandridge; 
Griffith. Ware; Jeffreys. 
P. nautileus (L.).—Reservoir-stream near Radlett; Selby. Ponds 
and ditches near River Lea, Sandridge ; Griffith. Ware ; Jeffreys. 
P. albus, Mull.—Reservoir-stream near Radlett; Selby. Watford; 
Brett. Brocket Hall lake ; Griffith. Ware; Jeffreys. 
P. spirorbis, Miill. — Near Watford, common ; Selby. River 
Lea at Water End; Griffith. Ware; Jeffreys. 
P. vortex (L.).—Near Watford, common; Selby. River Lea at 
Water End; Griffith. Ware; Jeffreys. 
P. complanatus (L.).—Near Watford, common; Selby ; Brett. 
Ditches near St. Albans; Griffith. Ware; Jeffreys. 
P. eorneus (L.).—Ditches of the River Colne between Bushey 
Mill and Watford; stream near Munden House, Watford; Selby. 
Watford; Brett. Ware; Jeffreys. 
P. contortus (L.).—Watford; Selby ; Brett. Brocket Hall lake; 
Griffith. Ware; Jeffreys. 
Physa fontinalis (£.).—Ditches of River Colne between Aldenham 
Abbey and Watford; Selby. Watford; Brett. Marshy places 
bordering River Lea, in neighbourhood of Sandridge; Griffith. 
Ware; Jeffreys. 
Limncea peregra (Miill.).—Pond near Medburn school, Elstree; 
Selby. Watford ; Brett. Ponds near Sandridge, common ; Griffith. 
Ware; Jeffreys. Yar. lacustris (Leach).—Brocket Hall lake ; Griffith. 
L. auricularia (L.).—Watford ; Brett. Brocket Hall lake, fairly 
common; Griffith. Ware; Jeffreys. 
L. stagnalis (L.).—Pond near Medburn school, Elstree; Selby. 
Watford; Brett. Brocket Hall lake, and ponds near Sandridge ; 
Griffith. Ware ; Jeffreys. 
L. palustris (Miill.). — Watford ; Brett. Brocket Hall lake, and 
ponds near Sandridge; Griffith. Ware; Jeffreys. 
L. truncatula (Miill.).—Watford; Brett. River Lea at Water 
End ; Griffith. Ware ; Jeffreys. 
