ACAVUS. 



49 



63. Acavus phoenix, Pfdffer. 



Helix pluvnir, Pfeiffer, Malak. Bliitt. i, 1854, p. 53 ; Hanley & 



Theobald, Conch. Ind. 1875, id. Vll, fi<-. G. 

 Helix melanotracjus, Ferussac, Hist. Nat. Moll. 1821, pi. 32 b, fifx. 6 



(var. a); Donovan, Natural. Repos. iv, 1834, pi. 133; Pfeiffer, 



Couch.-Cab., Ileliceen, i, 184G, pp. x & 32, pi. 3, fig. 3, pi. 7, 



fig's. 9, 10; Uheim, lUiistr. Conchyl.*, 1851, pi. 5, fig. 1; Reeve, 



Conch. Icon, vii, 1852, pi. 71, fig. 367. 

 Helix {Acavt(s) melnnotragus, Beck, Index, 1838, p. 37. 

 Helix (Macroon {Acavu/i)) 2)ha'nix, Pilsbry, Man, Conch, ser. 2, 



vi, 1890, p. 80, pi. 17, figs. 10-12. 

 Acavus pha-nix, Adams, Genera Moll, ii, 1858, p. 195 ; Pilsbry, Man. 



Conch, ser. 2, ix, 1894, p. 154, pi. 50, fig. 5 (radula), fig. 4 {e^^) ; 



Randies, Proc. Malac. Soc. London, iv, 1900, p. 103, pi. 9, tigs. 1, 



4, 13 (anatomy). 



Original description : — " T. imperforata, globoso-conoidea, tenui- 

 uscula, leviter rugata, subunicolor castauea, vel fusco, roseo et 

 luteo radiatim variegata, non fasciata, rarius roseo-albida ; spira 

 brevis, convexo-conoidea, vertice subtili, obtuso, albido ; sutura 

 mediocris, plerumque fusco marginata ; aiifr. 4 convexi, rapide 

 accrescentes, ultimus veutrosus, plerumque spiraliter obsolete 

 sulcatus, antice inflatus, sensim desceudens ; apertura perobliqua, 

 truncato-oblonga, intus lactea ; perist. late expansum et reflexum, 

 castaneo-limbatum, niargiuibus callo albo, extus castaneo- 

 niarginato, junetis, dextro superne arcuato, columellari declivi, 

 substricto, antice subtruncato, sursum perdilatato, piano. 



" Diam. maj. 58, min. 43, alt. 38 mill." (Pfeiffer.) 



Hah. Ceylon (Blanford, Kevill). 



Readily distinguished from A. Jmmastoma by its larger size, 

 the more inflated wliorls, and rather more depressed spire. The 

 bands or zones of that species are usually lacking, but 1 have 

 before me two specimens from the H. Nevill collection which 

 show a snbsutural and two supra-peripheral bands, the former 

 and one of the latter very distinct for the greater part but dis- 

 appearing on the latter half of the last whorl. Many specimens 

 from the same collection are transversely streaked, others are 

 much paler with brown peristome, some being almost white with 

 rosy lip, and one is an albino having a pure white peristome. 



From yl. superhus and A. greviUei it may be separated at once 

 by the more globose body-whorl and the less truncated columellar 

 plate. 



G4. Acavus snperbus, Pfeiffer. 



Helix snperba, Pfeiffer, Zeitschr. Malak. vii, 1850, p. 71 ; Reeve, 

 Conch. Icon, vii, 1852, pi. 71, fiff. 368; Pfeiffer, Conch.-Cab., 

 Heliceen, iii, 1853, p. 342, pi. 133, tigs. 1,2; Hanley & Theobald, 

 Conch. Ind. 1875, pi. 127, tig. 4. 



* This work contains two different plates of Helix numbered 5 and two 

 numbered 8. 



