164 HELICID^. 



] 36. Planispira trochalia, Benson. 



Helix trochalia. Benson, A. M. N. ir. ser. 3, vii, 1861, p. 82; 



Hanley & Theobald, Concli. Ind. 1870, pi. 28, fig. 7 ; Stoliczka, 



Proc. A. S. B. 1870, p. 87 ; Pilsbrv, Man. Concli. ser. 2, vii, 1891, 



p. 88, pi. 18, tigs. 67, 68. 

 A7npelita (Helix) bigshyi, Tryon, Amer. Journ. Conch, v, 18G9, 



p. 110, pi. 10, fig. 3. _ 



Helix {Planispira) trochalia, Nevill, Hand l^ist, i, 1878, p. 77. 

 Planispira (Trachia) trochalia, Pilsbry, Man. Conch, ser. 2, ix, 



1894, pp. 115, 116, pi. 34, figs. 4, 5 (faw and radula). 

 Planispira trochalia, Godwin-Austen, P. Z. S. 1895, p. 442. 



Original description : — " H. testa anguste iimbilicata, solidius- 

 cula, orbiculato-conoidea, subtrochiforini, irregulariter arcuato- 

 striatula, striis nonnullis prominentioribus, castanea, apicem versus 

 albida ; spira conoidea, apice valde obtuso, sutura levitei* impressa ; 

 anfractibus 5, primis convexiusculis, cajteris planiusculis, ultimo 

 acute eompresso-cariuato, antice breviter descendente, subtUvS 

 convexo ; apertura obliqua, elliptico-lunata ; pei'istomate tenui, 

 undique expanse concolori, marginibus subconniventibus, colu- 

 mellari dilatato, umbilicum profundum semitegente." (Benson.) 



Diaui. inaj. 17-5-23-5, min. 15-5-20-5, alt. 12-15 mill. 



Hab. Andaman Islands : Port Blair (Haughton). 



A peculiar form readily recognized by its trocboid spire. No 

 reference is made in the description to the fact that the last whorl 

 is suddenly contracted behind the peristome, nor to the presence 

 of a hydrophanous cuticle. The shell, moreover, is covered above 

 and below — except at the protoconch, which is smooth and 

 shining — with excessively minute and densely crowded, wavy, 

 spiral lines ; the base has in addition a few distant spirals. In 

 colour the species varies from pale fuscous to chestnut. Godwin- 

 Austen mentions a variety, conico-elata — one of Nevill's MS. 

 names — but gives no definition. 



137. Planispira vittata, Midler. 



Helix vittata, Miiller, Verm. terr. fluv. ii, 1774, p. 76; Wood, 

 Index Test. 1825, pi. 34, fig. 93 ; Orbigny, Diet. Hist. Nat. Atlas, 

 iii, 1849, pi. 19, figs. 3, 4 ; l)eshaves in Ferussac, Hist. Nat. Moll, 

 i, 1850, p. 233; Chenu, lllustr' Conchyl., Helix, 1851, pi. 10, 

 figs. 6, 7 ; Reeve, Conch. Icon. vii. 1852, pi. 78, fig. 412 ; Pfeiffer, 

 Conch.-Cab., Helix, i, 1853, p. 329, pi. 58, figs. 15, 16, 18, 19 ; 

 Hanley & Theobald, Conch. Ind. 1875. pi. 130, fig. 10 ; Kobelt, 

 Illustr. Conch. Buch, ii, 1879, pi. 73, fi"-. 21. 



Helix (Helico(/ena) vittata, Ferussac, Hist. Nat. Moll. 1822, pi. 25 A, 

 fig. 9, pi. 26, figs. 4-6. 



Helix spinolce, Villa, Disp. Syst. Conch. 1841, p. 55. 



Helix zonula, Wood, Index Test. Suppl. 1828, pi. 7, fig. 8. 



Helix {Planispira) vittata, Nevill, Hand List, i, 1878, p. 76. 



Helix {Eurystoma) vittata, Albers, Die Helic. 1850, p. 126 ; Trvon, 

 Struct. Conch, iii, 1884, p. 40, pi. 95, fig. 58; Tryon, Man. 

 Conch, ser. 2, iv, 1888, p. 120, pi. 33, figs. 59, 60, 62; Godwin- 



