THE EPJCENT MOLLUSCA OF TASMANIA. 106 



is at times found alive on the East Coast, while Spondylin^ 

 tenellus (Reeve) occurs on the North Coast, biit seldom as ;i 

 perfect shell. 



Of Brachiopoda, the best known is the so-called " Roman 

 Lamp," V/aldheimta flavescens (Lamarck), which is washed 

 up amongst seaweed on the Northern beaches, and is also 

 found alive in rock-pools in favourable situations, v/here the 

 tiny Megerlina lamarcMana (Davidson) is also found cling- 

 ing in numbers to the under-sides of the stones. Terehra- 

 tella Tuoicnnda (Solander) has been introduced into the 

 Derwent amongst oysters from New Zealand 



Among the terrestrial, or pulmonate, Gasteropoda, Bidi- 

 mus dufresnii (Leach) is one of the most widely-distributed, 

 varying greatly in size and texture, according to the locality. 

 B. tasmanicus (Pfeiffer) is our sole arboreal species, being 

 found on wattles and iDOobyallas on the. East Coast only. 

 Helix launcestonensu (Reeve), from the Scottsdale district, 

 is the finest representative of the genus in Tasmania ; H. 

 stephensi (Cox) being another good one. The European 

 H. aspersa (MuUer) and Zonites cellarius (Muller) are 

 plentiful in some of the gardens in Hobart and Launceston. 

 There are two Vitrinas, of which V. verreauxi (Pfeiffer) is 

 the most widely distributed throughout the Island. One tiny 

 species of Pupa, P. lincolnensis (Angas), found also in Aus- 

 tralia, has been discovered, near Swansea, by Mr. R. M. 

 Johnston. The small grey slug, Limax Itgrandi (Tate), is 

 abundant in the North, and there are some very large 

 spotted slugs, notably, Cystopelta petterdi (Tate), with 

 various smaller kinds in different parts of the Island. Of 

 fresh-water mollusca, there are several minute forms that 

 are of interest, especially the curious little Gundlachia, of 

 which two species are recorded for Tasmania; the genus is 

 only found in Trinidad and Cuba besides. There are some 

 forms of Amnicola and Hydrohia, one of which, Potamopyr- 

 gus, is common with New Zealand only. Ancylus irvince 

 (Petterd), from the Great Lake, is an unusually large form, 

 while Physa ehiirnea (Sowerby). from lagoons near Ross, is 

 a fine shell. Unio legrandi (Petterd) and U . depressus 

 (Lamarck) inhabit only the rivers that empty themselves 

 eventually into the Tamar. 



Most of the land shells are peculiar to Tasmania, whilst 

 many of the marine species are common to Australia, especi- 

 ally the Southern and Eastern shores of the continent ; and 

 some have a world-wide distribution, whilst a few appear to 

 be found now in a semi-fossil state only, such as Potamides 

 eheniniim (Bruguiere), Ranella epitrema (Tenison- Woods), 



