112 LAND SHELLS OF VICTORIA 



Observations. — In form and sculpture a close ally of L. morti 

 Cox. Both species possess radial lamellae, which are less developed 

 in L. mucoides. The last whorl is obtusely carinated, a feature 

 absent in L. morti. 



Type in Australian Museum, Sydney. 



Pamlaoma halli (Cox). 



1871. Helix (Rhyssota) halli Cox, in Legrand Coll. Mon., sp. 34, pi. 2, fig. 9. 

 1930. Laoma halli Cox. Gabriel, P.R.S. Vic. xliii, pt. 1, (N.S.), p. 81. 

 1937. Paralaoma lialli (Legrand). Iredale, Aust. Zool, viii, pt. 4, p. 314. 



Size of Type.—Maj. diam., 1-52; min., 1-26; alt., 101mm. 



Localities. — Castlemaine (F. L. Billinghurst) ; Frankston and 

 Tarraville (T. Worcester) ; Ferntree Gully, Mt. Donna Buang 

 (C. Oke) ; Trentham Falls (J. K. and R. C. Gabriel) ; Grampians, 

 Lome (Self) ; French Island (A. R. Trebilcock). 



Observations. — A minute form, found under decaying wood, 

 and in moss. Narrowly umbilicated and finely striated. It is 

 widely distributed in Victoria. Consistency in shape is not 

 apparent, as considerable variation is seen, more particularly in 

 regard to height. Iredale (he. cit.) regards Legrand as the 

 author of the species. 



Genus LAOMAVIX Iredale, 1933. 

 Laomavix collisi (Brazier). 



1868. Helix minima Cox, Mon. Aust. Land Shells, p. 10, pi. 12, fig. 8. (non 

 Helix minima Schlothehu, Min. Taseh., p. 340, 1818) (non Helix 

 minima H. Adams P.Z.S. Lond., p. 303, 1867). 



1877. Helix (Pitys) collisi Braz., P.R.S. Tas., for 1876, p. 168. 



1930. Laoma minima Cox. Gabriel, P.R.S. Vict., XLIII, pt. 1 (New Series), 

 p. 80. 



3933. Thryasona diemenensis Cox. Iredale, Rec. Aust. Mus., XIX, p. 54. 



1937. Id.,' Iredale, Aust, Zool., VIII, p. 315. 



Size of Type. — Maj. diam., 1-77; min., 1-52; alt., 0-76mm. 



Localities. — Bairnsdale and Tarraville (T. Worcester) ; Car- 

 rum (C. Oke) ; Jemmy's Point Lakes Entrance under stones, 

 decayed timber and fallen leaves (Self). 



Observations. — A small, shining, broadly umbilicated species, 

 with nothing comparable in Victoria. Further study of this 

 peculiar little shell convinces one of its misplacement in Laoma, 

 and the writer is in agreement with Iredale that a new genus is 

 necessary for its reception and Tjaomavix is now adopted. Cox's 

 name being invalid, the shell will be known as above. Type of 

 II. minima Cox is in the Australian Museum, Sydney. 



