140 RECORDS OF THE AUSTRALIAN MUSEUM. 



the antepenultimate three. A heavy funicle runs round the- 

 basal axis into the varix. Aperture perpendicular elliptical, 

 bordered by a singularly prominent varix. Length, 3-4 ; breadth,. 

 2'1 mm. 



The small size, strong spiral sculpture, and ab.sence of emargina- 

 tion on the anterior lip, characterise this eccentric species. 



Hab. — I gathered a few specimens on the beach at Mornington 

 Island, Gulf of Carpentaria, Queensland. 



RiSSOlNA RHYLLENSIS, GatUff and Gabriel. 



Rlssoina rhi/llensis, Gatliff and Gabriel, Proc. Roy. Soc. Vict., 

 xxi., 1908, pp. 367, 379, pi. xxi., tig. 8. 



Rissoinafausta, Hedley and May, Rec. Austr. Mus., vii., 1908^ 

 p. 117, pi. xxii., fig. 10. 



After interchange of specimens, it has been mutually agreed 

 that these names refer to the same species. That of R. rhyllensis 

 enjoys a few days precedence over R Janata. The species was 

 simultaneously observed by Dr. Verco in South Australia. i^ 



POTAMOPYRGUS RUPPIiE, Sp. nov. 



(Plate xli., tig. 17). 



Shell small, rather thin, oblong ovate, narrowly perforate. 

 Colour sometimes uniform brown, or buff or olive, more frequently 

 ground colour olive-buff with two cinnamon bands, one at the 

 horizon of the lip insertion, another midway between that and 

 the suture. Whorls four rounded. Surface smooth, but faint 

 keels are sometimes and irregularly developed. Aperture simple 

 entire, rounded l)elow and angled al)ove ; columella margin a 

 little reflected, inner lip consideral^ly thickened in the adult. 

 Length, 215; breadtli, IS mm. 



This is related to the Victorian /'. buccinoides, Quoy and 

 Gaimard ^^ but is smaller, proportionately broader, less tightly 

 coiled with fewer whorls. 



18 Verco— Trana. Roy. Soc. S. Austr., xxxii., 1908, p. .3-41. 

 1" Quoy antl Gaimard^Voy. Astrolabe, Zool., iii., IS.'U, p. 175, pi 58^ 

 figs. i:M5. 



