14 PROCEEDINGS OF THE NATIONAL MUSEUM vol.72 



aperture rounded with no sign of an angle in the outer lip to mark 

 the angle of the periphery. 



Doctor Cox's locality " northeast Australia " seems to indicate that 

 these specimens came from the mainland. More likely it is simply 

 a general locality and as such would include the islands in Torres 

 Strait. Because of their close relationship to Thersites waltoni of 

 Murray Islands which are quite distant from the coast it seems 

 almost certain that they came from an island and not from the 

 mainland. 



THEKSITE (HADRA) FOKSTERIANA FORSTERIANA Pfeiffer 



Plate 2, fig. 6 



1854. Helix forsteriana Pfeiffer, Proc. Zool. Soc, p. 254. 



1846-53. Helix forsteriana Pfeiffer, Conch. Cab., p. 373, pi. 140, figs. 9-10. 



1860. Helix_ hetuera Pfeiffer Proc. Zool. Soc, p. 134. 



Shell small, depressed-conic, moderately thick; whorls 6, slightly 

 convex, body whorl narrowly rounded, scarcely descending in front ; 

 base moderately convex, umbilicus rather small, partly concealed by 

 the reflected columella. Sutures well impressed, crenulated. Sculp- 

 ture of fine, slightly retractive growth lines and microsopic reticula- 

 tions or granulations finer and more plentiful than in other species 

 of the group. Aperture sublunate, peristome thin, reflected at its 

 lower part and broadly reflected at the columella. Color of spire 

 pale yellowish with three spiral bands of light chestnut, one below 

 and one above the periphery and one at the suture. A whitish periph- 

 eral band. Base very pale straw color much lighter than the spire. 

 Columella with a tint of chestnut at its upper end. Interior whitish 

 with the three exterior bands showing as tints of lavendar, the periph- 

 eral white band very distinct, peristome margined inside with pale 

 lavendar. 



The specimen figured (Cat. No. 317037 U.S.N.M.) measures: 

 Greater diameter, 21.5 mm.; lesser diameter, 18.5 mm.; height, 15 

 mm. It forms part of the Henderson collection and is labeled 

 " Lizard Island, Northeast Australia." 



The same lot contains two other specimens in the same collection 

 and from the same place. They are almost exactly like the figured 

 specimen. 



This species, although belonging in the group of Thersites M- 

 parMta, has a different color pattern and has a spire lighter than the 

 base. The granulation or reticulations of the spire while finer and 

 more plentiful than in other species is essentially of the same kind. 



Pfeiffer himself ^ says that his Helix hetaera is the same as his 

 HelAx forsteriana. 



" MoTiographia Heliceoium Viveiitium, vol. 5, p. 377, 1868. 



