THYSAtfOTA. 11 



Trochomorpha tabida, Pfeiffer, Malak. Blatt. ii, 1855, p. 132. 

 Nanina ( Thysanota) tabida, Nevill, Hand List, i, 1878, p. 54. 

 Ryssota tabida, Pfeiffer & Clessin, Nomencl. Helic. Viv. 1881, p. 53. 

 Trochomorplia ( Thysanota) tabida, Tryon, Man. Conch, ser. 2, iii, 



1887, p. 94, pi. 19, figs. 97, 98. 

 Eulota (Thysanota) tabida, Pilsbiy, Man. Conch, ser. 2, ix, 1895, 



p. 208. 



Original description: " T. angustissime umbilicata, turbinata, 

 solidula, conferte rugoso-striata, sab epidermide decidua, fuscula 

 alba ; spira convexo-conica, acutiuscula ; aufr. 8 lentissime accres- 

 centes, vix convexiusculi, ultimus non descendens, peripheria 

 subangulatus, super ne convexus v basi planiusculus ; apertura vix 

 obliqua, depressa, subangulato-lunaris ; perist. simplex, rectum, 

 margine basali versus insertionem leviter incrassato. 



" Diam. inaj. 17-J-, min. 16, alt. 11 mill." 



Nab. India : Nilgiris. 



Pfeiffer recognized the affinity between the present species and 

 T. tjuerini. It is, however, larger than the latter and not keeled, 

 while the whorls are more tumid and the umbilicus is narrower ; 

 the aperture is also different, being rather semilunate, the colu- 

 inellar margin ascending more obliquely. 



18. Thysanota guerini, Pfeiffer. 



Helix guerini, Pfeiffer, Eev. Zool. 1842, p. 304 ; ibid., in Philippi, 



Abb. Beschr. Conchyl. i, 1843, p. 12, pi. 3, fig-. 6 ; ibid., Conch. 



Cab., Heliceen, ii, 1853, p. 121, pi. 87, figs. 15, 16 j Reeve, Conch. 



Icon, vii, 1852, pi. 85, fig. 457 ; Hanley & Theobald, Conch. Ind. 



1870, pi. 55, fig. 1. 



Nanina (Thysanota) guerini, Martens, Die Heliceen, ed. 2, 1860, 

 r p. 63; Nevill, Hand List, i, 1878, p. 54. 



Trochomorpha guerini, Kobelt, 111. Conch. Buch. 1879, pi. 68, fig. 11. 

 Trochomorpha (Thysanota) guerini, Pfeiffer & Clessin, Nomencl. 



Helic. Viv. 1881, p. 82. 

 Helix (Thysanota) guerini, Tryon, Man. Conch, ser. 2, iii, 1887, 



p. 93, pi. 18, figs. 95, 96. 

 Eulota (Thysanota) guerini, Pilsbry, Man. Conch, ser. 2, ix, 1895, 



p. 208. 

 Thysanota guerini, Godwin- Austen, Moll. India, ii, 1907, p. 188. 



Original description : " T. umbilicata, trochiformis, epidermide 

 fusca, rugosa induta ; anfr. 7J vix convexiusculi, basi carinati ; 

 carina pilis confertis dense ciliata ; basis convexiuscula ; umbilicus 

 angustissimus, pervius ; apertura lata, lunaris ; peristoma simplex, 

 marginibus callo tenuissimo, nitido juuctis. 



" Diam. maj. 16, min. 15, alt. 10 mill." 



Hob. India: JNilgiries (Perrottet, Blanford) ; Anamullays (Bed- 

 dome). 



In his original description, Pfeiffer gave the following dimen- 

 sions : Diam. 22, alt. 13 mill. Subsequently (Mon. Helic. Viv. i, 

 1847, p. 118), the measurements quoted above were indicated 

 without reference to the previous figures. I assume the later 

 ones to be correct. 



