tTEROCTCLtrS. 105 



the mouth. Aperture circular, slightly oblique ; peristome double ; 

 the two portions separated by a sliallow groove, the inner cut away 

 into a moderate sinus above, and the outer turned up into a small 

 vertical wing, free from the penultimate whorl. Operculum 

 concave within, the centre Hat; flatly, concave without, with 

 lamellar free edges to the whorls, thickest at the circumference. 



mm. incli. 



" Major diam 11 U--14 



Minor ditto 9 0-36 



Axis 5 0.2 " {Blanford.) 



Hub. Burma : Thyet Myo, Pegu {Blanford) ; Bhamo and 

 Irawaddy Bank {Anderson). 



149. Pterocyclus insignis, Theobald. 



Pterocyclos iusi</nis, Theobald, J. A. S. B. xxxiv, part 2, 1865, 

 p. 278 ; lianiey tfc Theobald, Conch. Ind. 1870, pi. 5, figs. (5, 7 ; 

 Theobidd, Cat. Shells Brit. India, 187G, p. 38; I'feiffer, Mou. 

 Pueinn. iSuppl. 8, 1878, p. 385. 



Pterocyclus insiynis, G. iNevill, J. A. S. B. xlvi, 1877, p. 29 ; id.. 

 Hand List, i, 1878, p. 261 ; id., in Anderson, Zool. lies. 

 Exp. W. Yunnan, 1879, p. 889; Kobelt & Mbllendorff, ]>fachr. 

 Beuts. Malak. Ges. xxix, 1897, p. 113; id., Cat. Pneum. 1899, 

 p. 25 ; Kobelt, Uas Tierreich, Lief. 16, 1902, p. 166 ; id., Couch.- 

 Cab., Cyclophoridae, ii, 1909, p. 721, pi. 104, figs. 9, 10. 



Oriijtnal description : — "Forma typica. Testa albida, epidermide 

 flavesceute sive castanea, decidua vestita, castaneo-fasciata. Peris- 

 tomate duplici, antice valde expanso. Operculo iutus concavo, 

 extra planiusculo, inargiue vahle' radiate hirsute. — Lat. 1'2U ; 

 lat. oris intus 0-65." (Theobald.) [31 x 25 x 14 uuu.] 



IJab. India: tihiin States (Blanford). 



Var. planorbioides, G. Nevill. 



Pterocyclus insryni^, var. idanorbioiJes, Nevill, Hand List, i, 1878, 

 p. 261 ; Kobelt ifc MulleudorlT, Nacbr. JJeuts. Malak. Ges. xxxi, 

 1899, p. 135 ; id.. Cat. Pneuiu. 1899, p. 102. 



Orirjinal description: — "The spire is actually sunken in this 

 remarkable Planorbis-like form; the last whorl is niore com- 

 pressed ; the aperture smaller ; and the umbilicus more open and 

 shallo\v than in the type form. Tiie exca\ated suture is common 

 to both." (Nevill.) 



Hob. Burma: Kakhy en Hills (^uc/ez-soji). 



150. Pterocyclus magnus, Godwin- Austen. 



Pterocyclos tnaynus, Godwin-Austen, J. A. S. B. xlv, part 2, 1876, 



p. 174, pi. 7, tig. 3. ^ 

 Pterocyclus niayiius, Xevill, Hand List, i, 1878, p. 261 ; Kobelt & 



MuUeudortf, Nachr. Deuts. Malak. Ges. xxix, 1897, p. 113 ; id., 



