TASMANIAN LAND SHELLS. 15 



18. — Helix ( ) trajectura — Cox. 



Legrand's Col. for Mon., sp. 36, pi. ii., fig. 6. 



H. mixta — Cox, 



Legrand's Col. for Mon., sp. 38, pi. ii., fig. 11. 



Shell with a deep, narrow, half-covered umbilicus, conoid, thin,, 

 transparent, pale brown, not shining, irregularly coarsely striated with 

 lines of growth ; spire conical ; whorls 5 J, the last disproportionately 

 large and sub-carinated ; aperture large, slightly ?.ngled, oblique, 

 innately oval ; peristome simple, straight , margins approached ; colu- 

 mellar margin widely dilated and reflexed, half covering the umbilicus. 



Diameter, greatest 0-32, least 0-26 ; height, 0-20 of an inch. 

 Habitat. — Port Davey. 



There can be no reasonable doubt but that the two species created 

 by Dr. Cox are but slight variations of one form, more especially as 

 they were collected at the same locality, the similarity of the description 

 in Legrand's " Col. for Mon." are very perceptible, and the figures almost 

 identical. Very closely allied to the preceding. 



19. — Helix ( ) Vitrinaformis — Cox. 



Legrand, Col. for Mon., species 58. 



Shell imperforate, flatly depressed ; yellow brown, thin, horny^ 

 translucent; irregularly streaked with lines of growth longitudinally; 

 shining ; very finely striated with waved striae, above and below ; 

 whorls 4 1, rapidly increasing in size, flat above, last much dilated, not 

 descending in front ; spire not raised ; peristome straight, simple, thin ; 

 aperture proportionately very large. Innately rounded ; columellar mar- 

 gin expanded and impressed covering the umbilicus. 



Diameter, greatest 0-38, least 0-28 ; height, 0-78 of an inch. 



Habitat. — Springs, Mount Wellington, and foot of La Perouse 

 mountain. 



Legrand remarks of this — " An interesting species, easily recog- 

 nised by the fine longitudinal strise and Vitri7ia-like form. Until the 

 animal has been seen, it is impossible to determine the section." I col- 

 lected the type specimen in company with H. Forclei (Brazier), to which 

 shell it has a resemblance. The nearest to it in Australia is H. Fern- 

 shawensis mihi, from Victoria, from which it mostly differs in its more 

 depressed form. 



