ACAVUS. 49 



63. Acavus phoenix, Pfeiffer. 



Helix phoenix, Pfeiffer, Malak. Blatt. i, 1854, p. 53 ; Hanley & 



Theobald, Conch. Ind. 1875, pi. 127, fig. 6. 

 Helix melanotragus, Ferussac, Hist. Nat. Moll. 1821, pi. 32 B, fig. 6 



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



Conch. -Cab., Heliceen, i, 1846, pp. x & 32, pi. 3, fig. 3, pi. 7, 



figs. 9, 10 ; Chenu, Illustr. Oonchyl.*, 1851, pi. 5, fig. 1 ; Reeve, 



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

 Helix (Acavus} melanotragus, Beck, Index, 1838, p. 37. 

 Helix (Macroon (Acavus)} phoenix, Pilsbry, Man, Conch, ser. 2, 



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

 Acavus phcenix, Adams, Genera Moll, ii, 1858, p. 195 ; Pilsbry, Man. 



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



Randies, Proc. Malac. Soc. London, iv, 1900, p. 103, pi. 9, figs. I, 



4, 13 (anatomy). 



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

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

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

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

 rnediocris, plerumque fusco marginata; anfr. 4 convex!, rapide 

 accrescentes, ultimus ventrosus, plerumque spiraliter obsolete 

 sulcatus, antice inflatus, sensim descendens ; apertura perobliqua r 

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

 castaneo-limbatura, marginibus callo albo, extus castaneo- 

 marginato, junctis, dextro superne arcuato, columellari declivi, 

 substricto, antice subtruncato, sursum perdilatato, piano. 



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



ffab. Ceylon (Blanford, Nevill}. 



Readily distinguished from A. hcemastoma by its larger size, 

 the more inflated whorls, 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 subsutural 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 brow r n peristome, some being almost white with 

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



From A. superbus and A. grevillei it may be separated at once 

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

 plate. 



64. Acavus superbus, Pfeiffer. 



Helix superba, PfeifFer, Zeitschr. Malak. vii, 1850, p. 71 ; Reeve, 

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

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

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



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

 numbered 8. 



