146 RECORDS OF THE AUSTRALIAN MUSEUM. 



maturity the spire is overspread with a callus sheet obscuriug the- 

 sutures;. Another and thicker layer is extended on the body- 

 whorl in advance of the aperture. Aperture narrow, anteriorly 

 subrostrate, posteriorly channelled and ascending the previous^ 

 whorl. Outer lip with a thick varix externally and about ten 

 evenly spaced small denticules internally. Columella with four 

 strong elevated folds, the posterior horizontal about half way 

 along the aperture, the anterior running into the margin of the 

 subrostrate extremity. Length, 6 ; breadth, 4 mm. 



In size, shape, colour and general appearance M. geminata 

 closely resembles Marginella Icevigata, Brazier, ^^ from Torres 

 Strait and New Guinea. At first acquaintance of J/, geminata 

 I figured it and considered it a variety of M. hevigata.^*' On 

 reconsideration the differences though slight are found to he 

 constant and, supported by a very different habitat, are believed 

 to justify specific independence. 



M. tcevigata has a narrower aperture, taller spire, less angled 

 spire whorls, the varix more wing-like and has more and closer 

 denticules within the outer lip. It also iidial)its very warm 

 water but its twin lives in cold water. Marginella haiidinensisy 

 Smith, ^^ from tropical West Australia appears to be identical 

 with Brazier's species. To assist comparison I now re-figure 

 both species, M. Icevigata (PI. xlii., fig. 27) from Torres Strait and 

 M. geminata (PI. xlii., fig. 28) from 100 fathoms off Wollongong,, 

 N. S. Wales. 



Hah. — M. geminata is characteristic of the continental shelf,. 

 ranging from 25 to 250 fathoms and from Cape Byron in the- 

 North to Tasmania in the south. Under the wrong name of 

 M. Icevigata I have already reported it from several localities. In 

 this Museum it is represented as follows:— 100 fathoms off 

 Wollongong (type); 80 fathoms off Narrabeen ; 250 fatlioms off 

 Sydney (C Hedley) ; off Cabbage Tree Island (Museum Expe- 

 dition of 1880) ; 1 11 fathoms off Cape Byron (G. H. Halligan) ; 

 Westernport, Victoria (C. J. Gabriel) ; 63-75 fathoms Port 

 Kenibla (figured in 1903); 40-50 fathoms Cape Three Points; 

 54-59 fathoms Wata Mooli ; 50-52 fathoms Botany Heads (Thetis 

 Expedition) ; 40 fathoms off Schouten Island, Tasmania 

 (W. L. May). 



33 Brazier— Proc. Linn. Soc. N. S. Wales, i., 1877, p. 22 o ; Hedley— 

 Rec. Austr. Mus., iv., 1901, pi. xvi., fig. 5. 



34 Hedley— Austr. Mu.s. Mem., iv., 1903, p. 365, fig. 89. 

 a-'"' Smith— Proc. Malac. Soc, iii., 1899., p. 208, fig. 2. 



