80 



OSTRACODA AND MOLLUSCA FROM WATB'ORU. 



The following is a complete list of the Land and Fresh-water 

 Mollusca which have now been determined from this l^ed : — 



Helix rotundata, Miill. 

 H. nemoialis, Linn 

 II. hortensis, Midi. 

 H. arbu.stonim, Ijiiin. 

 H. caperata, Jfo)if. 

 Pupa uiusortrum (Linn.). 

 Cochlicopa lubrica (Miill.). 

 Succinea putn.s [Linn.). 

 riauorbis liueatus {Walk.) 

 V. albus, Mull. 

 V. glaber, Jeffr. 



Wanoibis spirorbis, Miill. 

 V. vortex {Linn.). 

 P. carinatus, Miill. 

 P. contortus (Linn.). 

 Physa I'ontinalis (Linn.). 

 Linma!a ])ereijra {Miill.). 

 ]i. palustris {Miill.). 

 Bythinia tentaculata ( Linn.) . 

 Sphiprium corneum {Linn.). 

 Pisidiuni amuicum {.Uiill.). 

 P. foutiuale {Dm p.). 



With the exception of Planorbis lineatus and glahcr, all these 

 species have been found in the neighbourhood of Watford in 

 a living state, but the two named have not before been recorded 

 for Hertfordshire. Pupa muscorum has been recorded from 

 Aldenham under the name of P. marginata, Drap. 



Trans. Hertfordshire Nat. Hist. Soc, Vol. XIII, I'art 1, February, 1907, 



