NOTES. 



191 



larva in extending the domain of a sea-dwelling animal, for, so far as 

 I have been able to learn, no adults of this animal have been introduced 

 into the coastal waters of either Sussex or Hampshire. 



J. H. Orton. 



Note on the Land and Frkshwatee Shelt,s of Tkxel and 

 Terschelling. {Read \ 3th JVovember, 1914.) — When paying a visit 

 to these islands in August, 1913, the following species of land and 

 freshwater Mollusca were collected. 



Texel seemed fairly jiroductive of shells, twenty species being found 

 there. I was interested to find a Vertigo, none of which genus had 

 appeared in my exploration of Friesland some years ago. 



Helicdla cantiana, too, turned up unexpectedly, and could not, I think, 

 have been imported, as I found it at Koog on the west side of the island, 

 far from any harbour or place where boats laud. Whether imported or 

 not, it seems to have established itself in some numbers. 



I also visited the intermediate island, Vlieland, but found no signs of 

 Mollusca there. 



Texel. 



Helix nemoralis, L. 

 Pyramidula rotundata (Miill.). 

 Theba cantiana (Mont.),var. cantiani- 



formis, Ancey. 

 Hygromia hisjnda (L.), var. hisx>idosa, 



Mouss. 

 Cochlicopa luhrica (Miill.). 

 Vallonia excentrica, Sterki. 

 Vertigo antivertigo (Drap.). 

 Limnaa pereger (Miill.). 



var. maritima, Jeff. 



var. balthica. 



var. acmninata, Jeff. 



var. ovata, Drap. 

 Liinncea palustris (Miill.). 



var. lacunosa (Zgl.). 

 Limncea trmicatida (Miill.). 

 Planorbis umhilicatus, Miill. 

 P. spirorbis (L.). 



P. contortus (L.). 



P. albus, Miill. 



Succinea elegans, Eisso, var. longi- 



scata, Morelet. 

 Sphceriiwi cornermi (L.). 

 Paludestrina ventrosa (Mont.). 

 Pisidium nitidum, Jenyns. 

 P. obtusale, Pfr. 

 P. subtruncatum, Malm. 



Teeschelling. 



LvmicBa pereger (Miill.). 

 L. pahistris (Miill.). 

 Planorbis spirorbis (L.). 

 Sphcerium corncum (L.). 

 Physa fontinalis ( L . ) . 

 Succinea putris (L.). 

 Paludestrina stagnalis, Bast. 

 Pisidium casertanum, Poll. 



Y. H. SiKES. 



