166 HELICIDJE. 



Eesembles Chloritis propinqua, Pfr., but may be distinguished 

 by the roughened granules. The bands vary considerably, but the 

 commonest form appears to be one with a dark, well-defined, 

 supra-peripheral band, with two paler linear ones above it and 

 four or five narrower and paler ones below it. Specimens without 

 bands also occur. 



124. Planispira atkinsoni, Theobald. 



Helix atkinsoni, Theobald, J. A. S. B. xxviii, 1859, p. 305 ; 



Hanley & Theobald, Conch. Ind. 1870, pi. 15, fig. 9, 1874, 



pi. 84, figs. 2, 3. 

 Helix (Trachia) atkinsoni, Try on, Man. Conch, ser. 2, iv, 1888, 



p. 56, pi. 12, figs. 83-85. 

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



1894, p. 116. 



Original description : " Testa depressa, infundibuli-forme- 

 umbilicata, lineis transversis rugose striata, lineisque spiralibus 

 obscure leviter decussata, obtuse carinata, sordide albida (forsan 

 in meliore specimine cornea) semitranslucente, sutura impressa. 

 Anfract. 5 convexiusculis, apertura obliqua. Perist. leviter 

 incrassato, non reflexo. 



"Diam. 0'54, alt. 0-20." (Theobald.) 



Hob. Burma : Moulmain (Atkinson) Tenasserim (Beddome). 



A specimen collected at Tenasserim, received from the late 

 Col. Beddome, enables me to supplement the above meagre 

 description, which must have been drawn up from a dead and 

 worn specimen. 



Shell moderately umbilicated, lenticular, pale fuscous ; suture 

 shallow but well marked; whorls 5, slightly convex, increasing 

 slowly and regularly, the last slightly dilated at the mouth ; the 

 apical whorl shining, very finely rugosely striated, the strisB 

 intersected by spiral lines, the transverse striae becoming more 

 accentuated and the spiral lines becoming deeply incised as the 

 growth of the shell proceeds, the former being cut into sub- 

 quadrate granules by the latter on the later whorls, giving the 

 upper and outer side of the shell a rough rasp-like texture; 

 the spiral incised lines cease somewhat abruptly a short distance 

 below the periphery, and the transverse strise also almost dis- 

 appear on the underside, which is therefore almost smooth and 

 shining. Aperture oblique, subquadrate-ovate, margins of the 

 peristome approaching, upper sinuate, inflected, acute, the others 

 slightly thickened and reflexed ; outer regularly curved, basal 

 almost straight, columellar ascending ; umbilicus funicular. 



Major diam. 12, minor 10, alt. 475 mm. 



The species, if correctly referred to Trachia, is a somewhat 

 abnormal member of this group owing to its coarsely granulated 

 upper and lateral surface and the acute inflected upper margin of 

 the peristome. 



