PEAnSONIA. 113 



Shells Brit. India, 1876, p. 38 ; Nevill, J. A. S. B. xlvi,1877,p. 28; 



id., ill Anderson, Zoul. Res. E.\p. \V. Yunnan, i. 1879, p. 889. 

 Ptcrocyclos {HSpiraaduvi) andersv7ii, Hauler & Tlieubald, Conch. 



lud. 1870, pi. 49, figs. 3, 4. 

 I'tcroci/clus (Spiracidum) andersoni, Nevill, Hand List, i, 1878, 



p. 264. 

 Spiracidum (s. sir.) andersoni, Kobelt & MoUendorff, Nachr. Deuts 



Malak. Ges. xxix, 1897, p. 114 ; id., Cat. rneiini. Is99, p. 26. 

 Pearsotiia {I'earsonia) andersoni, Kobelt, Ua.s Tierreicli, Lief. IG, 



1902, p. 172. 

 Pearsimia andersojii, Kobelt, Conch. -Cab., Cyclophoridae, ii, 1911, 



p. 7G(J, pi. 112, tigs. 10, 11. 



Or!(/iiial description: — "Testa late umbilicata, depressa, dis- 

 coidea, oblique striata, lineis elevatis minutis spiralibus supenie et 

 })r3Bsertim juxta peripheriani, Bed noii circa umbilicum, confer- 

 tissime decussata, albide, strigis oastaneis fnlguratis radiantibus 

 picta. Spira plana, apice vel piano vel vix exsertiusculo, sutura 

 profunda. Aufr. 4|, teretes, ultiinus versus aperturam longe 

 descendens, 5-6 mill, pone peristoma tnbulo suturali reverso 

 parvo, arcuatim recurvato vel subrecto et libero, 2-3 mm. longo 

 munitns. Apertura diagonalis rotunda; peristoma continuum, 

 duplex, internum expansiuscuhim undique appressum, postice 

 juxta anfractutn peiniltimum profunde angulatim siniiatum, 

 externum expansum, supra sinum dilatatum, juxta anfraetiim 

 penultimum instar cuculli plani porreetum. Operc. persimile ei 

 *S)). Jiispidi, corneum, intus concavum, extus convexum, margiiiihus 

 anfractuum, prjesertim e.xternorum, lameilatim liberis, apice 

 plani (isculo. 



" Diam. maj. 15|-17, min. 12-13|, axis 5-G, apert. diam. intus 

 5 mm." (Blanford.) 



Hab. Burma: Bhamo and right bank of IrvawnAilj {Anderson). 



" Distiugnislied from Sp. avanum, AV^. Blauf., by its more 

 oblique mouth, differently shaped and more expanded peristome, 

 by the liorizontal cowl-shaped projection running forwards along 

 the last whorl instead of being vertical, the greater distance of tlio 

 sutural tube from the mouth, and the much more convex oper- 

 culum." (Blanford.) 



IGl. Pearsonia assamensis, Falton. 



Spiracidum asmmen.sc, Fulton, Nautilus, xiv, 1900, p. 87. 



Orir/inal description : — " Shell discoidal, flat above, very broadlv 

 umbilicated, dark brown with a few oblique .stripes of a lighter 

 color, encircled by four rows of hairs arranged in tufts, one being 

 at the periphery, one above, and two below, the latter two are 

 often worn off in older specimens; wliorls 4^, slightly convex 

 above, last rounded ; tube eri^ct, short, inclined towards the apex, 

 situated 2 mm. from the margin of the apeiture ; peristome white, 

 somewhat thickened, bordered by a narrow flange; aperture 

 oblique, circular; operculum shelly, whorls 5. 



