ACATUS. 51 



Yar. roseolabiata, Nevill. 

 Helix supevha, Ilanley & Theobald, Conch. Ind. 187o, pi. 127, 



fio-. 4. 

 Helix (Acavus) superha, var. roseolabiata, Nevill, J. A. S. B. 1, 1881, 



Heliv (Macrobn {Acnvus)) superba, var. roseolabiata, Pilsbrv, Man. 

 Conch, ser. 2, vi, 1890, p. 8l>, pi. 16, figs. 1, 2. 

 Like the last it can only be separated from typical A. superbus 

 by the colour of the lip, which varies from pale to a brilliant deep 

 rose. 



Go. Acavus waltoni, lieeve. 



Helix mltoni, lieeve, P. Z. S. 1842, p. 49 ; ibid., Conch. System, ii, 



1842, pi. 106, tig. 23. 

 Helix loaltoni, Pleifier, Mon. Helic. Yiv. i, 1847, p. 19; Ferussac, 



Hist. Nat. Moll. p. 303, pi. 93, figs. 1,2; Reeve, Conch. Icon. 



vii 18o2, pi. 72, fig. 372; Pfeiffer, Conch.-Cab.,IIeliceen, ii, 1853, 



p. 267, pi. 121, fig8. 1-3 ; Chenii, Man. Couchyl. i, 1859, p. 453, 



figs. 3383, 3385 ; Fiiruier, Vie & Mceurs des Anim. 1866, p. 385, 



fio-s. 204, 205; Hanley & Theobald, Conch. Ind. 1875, pi. 127, 



fifr. 1 ; Sarasin, Ergebu. Naturw. Forscli. Ceylon, 1, heft 2, 1888 



pp. 35-69, pi. G-8 (embryology). 

 Heliv (Ac'tcus) waltoni, Albers, Die Heliceen, 18o0, p. 100 ; Nevill, 



Hand List, i, 1878, p. 81 ; Cooke, Cambr. Nat. Hist, iii, 1895, 



p. 304, tig. 204. 

 Oliqospira waltoni, Ancey, Conch. Exch. u, 188/ , p. 22. 

 Heliv {Macroon {Acavus)) wultoiii, Pilsbry, Man. Couch, ser. 2, vi, 



1890, p. 83, pi. 18, figs. 20, 21. ^ 



Acacella waltoni, Jousseaume, Mem. Soc. Zool. France, va, 1894, 



p. 288. 

 Acavus valtoni, Pilsbry, Man. Conch, ser. 2, ix, 1894, p. 154. 

 Acavus icaltoni. Handles, Proc. Malac. Soc. London, iv, 1900, 



p. 103, pi. 9, tigs. 6 (radula), 10, 15 (anatomy). 



Ori(jinal description :— " Hel. testa ovata, depressa, aufractibus 

 ventricosiusciilis, ultimo superne productiore, rubido-fusca, radiis 

 loiigitudinalibus obsolete picta ; epidermide tenui, peculiariter 

 maculosa, induta : apertura subquadrato-ovali, margiuibus uiger- 

 rimis disjuiictis ; labro acutissime reliexo." {lieeve.) 



Major diam. 48-59, minor 32-39 mm., alt. 30-31-5 mm. 



Jlah. Ceylon. 



The hydrophanous patches of the pcriostracum are very 

 characteristic of the species and, while being almost obsolete in 

 some specimens, form definite patterns in others ; in one specimen 

 in my collection they are disposed in spiral bands, in another 

 they form obliquely descending patches above and spiral bands 

 below the peripliery, while in a third shell they are so crowded 

 as practically to cover nearly the whole of the surface. Tlie 

 peristome and parietal band "vary from a deep blackish to liglit 

 purplish brown. The sculpture also varies considerably ; the 

 earlier whorls have the transverse striae cut into granules by 

 the incised spirals, a feature which in some shells is equally 

 pronounced on the body-whorl, but in others becomes almost 



B 2 



