TASMANIAN LAND SHELLS. 29 



colouration, although occasionally specimens are to be met with 

 on the Cataract Hill with irregular black lines of growth. It is a much 

 flatter shell than H. Legrandi, and has a more open umbilicus, and is 

 also very different in habit. H. Legrandi is rarely, if ever, found in 

 greater numbers than three or four together, nestling under logs and 

 stones in dry situations ; whereas the present species is almost invariably 

 found gregarious in large numbers, generally in company with H. 

 Luckmani and H. Hobarti. 



43.— Helix ( ^^) Wadensis — G. E. Beddome. 



Pro. E.S.T., April, 1879. 



Shell with a large perspective umbilicus equalling one-quarter of 

 its diameter, depressed, thin, horny-yellow ; whorls 3|^, slowly increasing, 

 regularly finely striated above and below ; suture deep ; margins distant, 

 joined by a very thin, smooth callus ; mouth ovately-lunate ; margins 

 simple. 



Diameter, greatest 2, least 1| ; height | mil. 



Habitat. — Gad's Hill to Mount Bischoff, found in and under 

 decayed timber. 



This is one of the four novelties discovered by Messrs. Beddome, 

 Johnston, and Atkinson during a recent collecting trip to the North- 

 West Coast. This species is not unlike H. Kershawi (mihi), but is of a 

 paler colour, the spire is never submerged, and the sculpture is very 

 different. 



Under the microscojDe, I find the nucleus (\h whorls) is spirally 

 striate, and the interstices obsoletely, transversely striate. 



44. — Helix ( ) stellata — Brazier. 



Pro. Zool. Soc, 1870, page 662. 

 H. similis — Cox. 



Men., 1868, p. 123, pi. xii., fig. 12. 



H. derelicta — Cox. 



Legrand's Col. for Mon., sp. 11. 



Shell deeply and perspectively umbilicated, discoid ; spire depressed, 

 chestnut-brown, not shining, regularly and finely ribbed on the upper 

 and under surface ; whorls 4J, rounded, last whorl descending a little in 

 front ; suture deep and narrow 3 peristome simple, thin ; aperture 

 round ; margins closely approximating ; columellar margin not reflected 

 at the base. 



