52 



obsolete ; in some the body-whorl is more or less malleated in 

 places, in others it is covered with spiral furrows. 



Var. polei, Collett. 



Acavus (Oligospira) poleii, Collett, J. Ceylon Br. R. A. S. xv, 1899, 



p. 153, figs. A, B (shell), C (eg-g). 

 Acavus polei, Handles, Proc. Malac. Soc. London, iv, 1900, p. 105, 



pi. 9, figs. 7, 11, 16 (anatomy). 



Hob. Ceylon : Udagama (Pole). 



The only character differentiating this form from A. waltoni 

 appears to be the white peristome and parietal callus. Some 

 anatomical differences are indicated by Mr. Eandles, but I doubt 

 these being of sufficient diagnostic value. 



66. Acavus skinneri, Eeeve. 



Helix skinneri, Reeve, Conch. Icon, vii, 1854, pi. 197, fig. 1387 ; 



Hanley & Theobald, Couch. Ind. 1875, pi. Ill, fig. 1 ; Dohrn, 



Conch. Cab., Heliceen, iv, 1881, p. 601, pi. 175, figs. 13, 14; 



Semper, Reisen Arch. Philippinen, Wiss. Res. 2, iii, 1870, p. 100, 



pi. 12, fig. 7 (anatomy), pi. 16, fig. 5 (radula). 

 Helix (Acavus) skinneri, Pfeiffer, Malak. Blatt. ii, 1856, p. 144 ; 



Nevill, Hand List, i, 1878, p. 81. 

 Acavus skinneri, Frauenfeld, Verh. K.-K. zool.-bot. Ges. xix, 1869, 



p. 876; Pilsbry, Man. Conch, ser. 2, ix, 1894, p. 154, pi. 50, 



figs. 1, 8, 26 (anatomy, etc.) ; Randies, Proc. Malac. Soc. London, 



iv, 1900, p. 103, pi. 9, fig. 5 (anatomy). 

 Oligospira skinneri, Ancey, Conch. Exch. ii, 1887, p. 22. 

 Helix (Macrodn (Acavus)), Pilsbry, Man. Conch, ser. 2, vi, 1890, 



p. 84, pi. 18, figs. 17-19. 

 Acavella skinneri, Jousseaume, Mem. Soc. Zool. France, vii, 1894. 



p. 288. 



Original description : " Shell subglobosely depressed, thick, 

 solid, very obliquely produced towards the aperture, everywhere 

 minutely granulated, spirally broadly superficially grooved, livid 

 chestnut, spirally freckled with a fulvous epidermis, disposed in 

 hieroglyphic spots ; spire short, rose-colour beneath, small ; 

 suture impressed; whorls three to four, last whorl very much 

 the largest ; aperture subquadrately oblong, lip externally broadly 

 thickened, interiorly densely callous, continuous over the body- 

 whorl, everywhere deep purple-violet." (Reeve.) 



Major diam. 31-38, min. 22-26 mm. ; alt. 17-22 mm. 



Hob. Ceylon (Skinner} Upper Onavah (Layard). 



The species is characterized by the callous growth on the 

 outside of the peristome, evidently formed by the accumulation 

 of the reflexed portion of the lip. In a specimen in my collection 

 this growth measures 8 mm. in width. The numerous spiral 

 ridges on the body-whorl appear to be a constant character. The 

 earlier whorls have the same decussating incised spirals as in 

 A. ivaltoni, but the body-whorl is very finely and regularly 

 granulated, the granules being arranged in quincunx. 



