JOURNAL OF CONCHOLOGY. 27 1 



NOTES ON A COLLECTION OF GUERNSEY AND 



SARK MOLLUSCA MADE BY 



J. R. BROCKTON TOMLIN, IN AUGUST, 1884. 



By J. W. TAYLOR. 



Through the kindness of Mr. TomUn, of Pembroke College, 

 Cambridge, I have received a small collection of the Land and 

 Freshwater Shells collected by himself at the islands of Guernsey 

 and Sark. 



Mr. Tomlin, in his letter accompanying the specimens, 

 says : " seeing the dearth of records for these islands, I thought 

 it might be of use to send yon some specimens while I am on 

 the spot. The Freshwater species are a fairly complete set with 

 the exception oi Linmcea glabra, L. truncatula, Pisidiiun nitidum, 

 and the two species oi Ancyhis." 



Mr. Tomlin mentions in his communication the occurrence 

 of Arion ate/; Liinax agrestis, L. maximiis, and Amalia gagates, 

 but was unfortunately prevented from sending specimens. The 

 total number of species in the collection is nineteen, of which six 

 only are freshwater. 



As inhabitants of the Channel Islands, Dr. Jeffreys' British 

 Conchology gives (either inferentially or directly) the following 

 additional 31 species, of which I have not yet seen specimens. 

 SphceriufU corneuvi, S. laaisire, Fisidiii?n nitidiwi, P. roseum, 

 Planorbis lineatiis, P. nautileus, P. spirorbis, L. trzincahda, L. 

 glabra, Ancylus fluviatilis, Limax gagates, L. a?-bo/ uni, Testa- 

 cella haliotidea v. scut7ilu7n, Succinea elegans, Zonites nitidus, Z. 

 crystallinus, Helix aculeata, H. virgata, H. caper ata, H. rotun- 

 data, H. pygmea, H. pidchella, Pupa ringens, P. marginata. 

 Vertigo antivertigo, V. pygviea, V. edentula, Balea perversa, 

 Achatina acicula, Carychiuni minitnum, and Cyclostojiia elegans. 



Pisidium pusillum Gmel. — -Four specimens of this species, 

 collected at Sark, were sent, all moderately uniform in size 

 and appearance and encrusted with an apparently ferru- 

 ginous deposit. The average dimensions are 2^ mill, 

 from beaks to front margin, and 3 mill. wide. 



