218 



W. T. Blanford — Contr Hut ions to Indian Malacology. [No. 4, 



31. Realia decitssata, sp. nov. 

 Testa perforata, ovato-conica, tenuiuscula, striis ohliquis incrementi, 

 aliisque spiralihus, minutis, suhlente suhtilissime decussata, in anfractihus 

 superiorihus, nisi duohus mpremis, undique, atque in inferiorihus et supra 

 et infra suturani costulaio-striata, padlide rufescentifulva, anfractu ultimo 

 cingulo pallido circimdato. Spira conica, apice acuto, sutura impressd- 

 Anfr. 6, convexi ; ultimus ad peripJieriam rotundatus, subtus convexiis, ra- 

 diatim striatus, in umlilico costulafo-striatus, lined impressd lasali in loco 

 carin<s circum uinhilicum instructus. Apertura oiliqua, rotimdato-ovata, ^ 

 longitudinis suhccquans. Peristoma tenue, marginihus suhconniventilius, 

 callo tenui junctis, externo hasalique rectis, columellari subtus expansiusctdo, 

 juxta perforationem retrosinuato. Operc. ? Long. 3f , diam. 2f ; ap. long. 

 If, lat. \\ mm. 



Hab. Cum prfficedeutibus in iusulis Andamanicis {J, Anderson'). 



Shell perforate, ovatelj conical, rather thin, finely marked with oblique 

 strise of growth and minute decussating spiral lines (only visible beneath 

 the lens), costulately striated on the upper whorls (except the two upper- 

 most) and close to the suture on the lower whorls, pale rufescent brown, 

 with a pale band round the body whorl. Spire conical, apex sharp, suture 

 impressed. Whorls 6, convex ; the last rounded at the peripheiy and be- 

 low, radiately striated beneath, more strongly in the umbilicus, and having 

 an impressed line at the base around the umbilicus in the place of a keel. 

 Aperture oblique, oval, but little higher than broad, about -f- of the length. 

 Peristome thin, the margins approaching each other and united by a thin 

 callus ; tlie outer and basal edges simple, columellar margin slightly expanded 

 below, curved back into a shallow re-entering sinus close to the perforation. 

 Length 015, diameter 0*11 ; length of aperture 07, breadth 06 inch. 



This shell is distinguished by its fine decussated striation. I have but 

 a single specimen, received from Dr. J. Anderson, with the othci-s. Un- 

 fortunately no figure has been given, as I did not observe the distinction 

 until after the accompanying plate had been drawn. Independently of 

 sculpture, the species may be distinguished from O. disterniina by its less 

 globose form, and by the absence of the keel around the perijAery ; from 

 R. andersoni by its much smaller size, more rounded whoiis, and by the 

 absence of the keel; and from i2. by rounder whorls, by colour, and 



by its rather more turreted form. 



There is thus evidence of four different forms of Realia in the An- 

 daman Islands. The genus is absolutely unknown in either India or 

 Eurma, the species of Omphalotropis (O. aurantiaca) once reported from 



