205 



NOTES ON SOUTH AUSTRALIAN MARINE MOLLUSCA, 

 WITH DESCRIPTIONS OF NEW SPECI ES.- PART IV. 



By Jos. C. Veuco, M.D., Loud., F.R.C.S., Eng. 



[Read October 2, 1906.] 



Plates VIII. to X. 



Family PATELLID^, Carpenter. 



Genus Patella, Linne. 

 Helcioniscus tramoserica, Martyn. 

 Patella tramoserica, Martyn, Univ. Conck., t. 16; Reeve, 

 Conch. Icon., Mon. Patella, 1854, pi. xiii. f. 27; Adcock, Hand- 

 list ot Aquatic Moll., S. Aust., 1893, No. 392; Pritchard and 

 Gatliff, Proc. Roy. Soc, Vict., 1903, xv. (n. s.), p. 191; Rdcion- 

 iscus tmiiiusericus, Martyn, Pilsbry., Tryon's Man. Conch., 1891, 

 xiii., p. 142, pi. Ixx., hgs. 49, 50, 51, 52; Tate and May, Proc. 

 Linn. Soc, N.S.W., 1901, p., 411. 



Fatella diemenensis, Philippi, Zeit. f. Maiak, 1848, p. 162: 

 type locality, Hobart; Pilsbry., Tryon's Man. Couch., xiii., p. 155. 

 ratelia oariegata Reeve, Conch. Icon., 1854, Mon. Patella, 

 pi. It), 1. 36, a, h, and c. 



Fatella antipodutn, E. A. Smith, Voy. Erebus and Terror, 

 Moll., p. 4, t. 1, f. 25, 1874, teste Pilsbry., op. cit., p. 142. 



Pritchard and Gatlijffi, loc. cit., give Rclcioniscus melanosto- 

 mus, Pilsbry., Tryon's Man. Conch., xiii., 1891, p. 151, pi. xxxii., 

 iigs. 67 and 69 as a synonym. 



This is a very variable shell. The large yellowish or rose- 

 tinged shell figured by Reeve is comparatively rare in South 

 Australia. Some are wholly salmon-coloured without any rays, 

 others have dark chestnut rays. There is a horn-coloured 

 variety with yellow-brown rays, and fine black lines, mostly 

 in pairs in some of the interspaces. The black Lines may be 

 quite wide, and be in all the interspaces, and they may be 

 interrupted or reticulate. The variety variegata of Reeve 

 is more common ; of a yellowish tint, rather translucent, with 

 more or less interrupted dark purplish rays and very irides- 

 cent interior. These merge into a larger, more hemispherical 

 form of stouter build, recalling Philippi's description of F. 

 diemenensis, which seems to be our usual variety, and these 

 into one with very broad, dark, liver-coloured rays separated 

 by narrow bands of white. 



Helcioniscus illibrata, spec. nov. PI. x., figs. 6 to 14. 



Shell minute, rather solid, conical ; apex blunt, scarcely 

 anterior : posterior slope scarcely convex, anterior scarcely 

 concave ; no radial sculpture : some irregular growth lines. 



