JSjJJ Kkrshaw, Studio* on Australian Charopida — 4 



figure although Iredale describes it as. flat. The shell is smaller than species 

 of Gyroi'oehJea, while even more noticeable is the smaller umbilicus. Iredale 

 (1941, p. 269) points out that the shell is more loosely coiled, has very fine 

 sculpture, white the protoconch is smooth He added a second species, C, 

 intense Iredale 1941, from Byron Bay. 

 Distribution: New South Wales, 



Letomflla Iredale 194] : l.ctomala was introduced for the species L. con- 

 iorhts Hedley first placed in the dentate genus, Hhophodon Hedley. How- 

 ever /-. contcrtus differed as has already been noted by the writer, in having 

 toil few apertural lamellae, and the sculpture is much finer. In defining 

 Lrtomoh, Iredale draws attention to the large smooth protoconch ; sigmoid. 

 rather irregular sculpture; sinuate outer lip, giving a distinctive aperture, 

 narrow above and broader below. There arc three lamellae, one on the inner 

 Up, and two basal on the outer lip 



Distribution: New South Wales. 



Kj-.y to tup. Gfnkra of Group (r) Convex Gk.sera 



Shell with spire elevate, aperture not dentate. 

 Apes radially striate, Up smooth. 

 Interstitial sculpture fine striae. 

 Umbilicus wide, cavernous. 

 Primary adult sculpture, close coarse radial ribs - . Pimo/jpra 

 Primary aduh sculpture, strong distant radial ribs . Iipimctunt 

 Apex smooth 

 Adult .sculpture elevated radial ribs. 



lnterslial sculpture fine radial, taint spiral striae. 



Umbilicus wide, ribs with bristles ^etomedia 



Adult sculpture numerous tine curved nblcis. 

 Interstitial sculpture absent- 

 Umbilicus narrow . . . . . Crutopa 



Shell carmate. 



Adult sculpture radial ribs with dominant secondary spiral. 



Umbilicus moderately wide ThesMowcnxor 



Shell with marked groove above periphery at aperture. 

 Aduh sculpture hold radial rihs, subrujjose. 

 Interstitial sculpture fine striae. 



Umhihcus very wide (J diameter) .. .. .. , Hnnnoropo 



Shell will spire elevate, aperture lamellae tew. 



Adult sculpture fine rudials, microscopic spirals 

 Protoconth spirally lirate. 



Umbilicus very small, almost absent tJischoffcntt 



Adult sculpture coarse sharp radial ribs. 

 Interstitial sculpture line striae. 

 Shell with spire depressed, apertural lamellae lew. 

 Adult sculpture fine close rugose striae. 

 Protoconch smooth. 



Umbilicus wide, shallow , J.* f t(^nah 



Umbilicus moderately narrow, deep .... i . , ,, , Dsutheroan 



RtvKKKFNCKS 



Iredale, T. (1939) Jounu Hoy, SVft W- Ausir. xXv U938-39) : 1-74, pJ. 1-5. 



(1941) Guide to the Land Shells of New South Wales. Part 2: 



Austr. Nat- 10. i&) : 262-269. Part 3: op. tit, JI (1) : 1-8. 

 Kershaw. R. C (195-0 Viet. A 7 nf 71 to), Oct.: y5-96. 

 (1955) P'jtU Nat, 72 (2), June: 28-30, 



