44 HELICIBiE. 



59. Pyramidula? halyi, Jousseaume. 



Trichia halyi, Jousseanine, Mem. Soc. Zool. France, vii, 1894, p. 271, 

 pi. 4, fig. 2. 



Original description : — " Testa parva, late et prof unde umbili- 

 cata, globoso-conica, irregulariter striatula, vix nitida, subopaca, 

 corneo fusca, spii'a conoidea, apice obtusa ; aufr. 4 rotundati, 

 sutura profunda separati, ultinnis iion descendens, superne 

 planulatus ; apertura perobliqiia, subcireularis ; perist. simplex, 

 acutum, rectum, margine umbilicari uon reflexo. 



"Diam. et alt. 1*5 mm." (Jousseaume.) 



Hah. Ceylou : Nuwara Eli>a (/SzHion). 



This species, referred to Trichia by Jousseaume — a genus 

 certainly not represented within the limits of the Indian Empire 

 — I place here not without some doubt, but no other genus 

 appears so well fitted for its reception, and we have already two 

 species in the Indian Peninsula, one of them in the Nilgiri Hills, 

 and since the fauna of Ceylon shows many traces of affinity with 

 that of Southern India, the extension of the genus to Ceylon 

 offers no insuperable difficulties. One of Jousseaume's figures — 

 that showing the inferior side — has been drawn by the artist as 

 a sinistral shell, the other two figures being correctly shown 

 as dextral. 



Family HELICID^, Pilshry. 



Subfamily ACAVIN^, Pilsbnj. 



Genus ACAVUS, Montfort. 



Acavus, Moutfort, Conch. Syst. ii, 1810, p. 234 ; Semper, lleisen 

 Arch. Philippinen, Wiss. Re.s. 2, iii, 1870, p. 99 (anatomy)'; 

 Sarasin, Ergebn. Xaturw. Forsch. Ceylon, i, 1888 (embryoloo:y) ; 

 Binuey, Ann. N.Y. Acad. Sci. iii, 1884, p. 92 (dentition) ; Pilsbry, 

 Man. Conch, ser. 2, ix, 1894, p. 153 ; Randies, Proc. Malac. Soc. 

 London, iv, 1900, p. 103 (anatomy). 



Oliffospira, Aucey, Conch. Exch. ii, 1887, p. 22. 



Acavella, Jousseaume, Mem. Soc. Zool. France, vii, 1894, p. 288, 



Type, Helix hcemastoma, Linne. 



Range. Ceylon. 



" Shell imperforate, globose depressed or globose trochoidal, 

 solid, bright coloured. Whorls less than 5, rapidly increasing, 

 the several earlier forming the nuclear or emhrijonic shell, which is 

 about one-third the diameter of the adult. Last whorl deflexed in 

 front. Aperture A^ery oblique, the lip vividhj coloured, and broadly 

 expanded : columellar margin long, obliquely descending, hroadlg 

 flattened, the cohuuellar lip adnate. 



" Animal with undivided sole and no pedal grooves ; lung and 



