i06 cyclophoridA. 



Cat. Pneum. 1899, p. 2-5; Kobelt, Das Tierreich, Lief. 16, 1902, 

 p. 166 ; id., Conch.-Cab., Cyclophoridae, ii, 19] 0, p. 753, pi. 112, 

 figs. 3, 4. 



Original description: — "This shell is similar in form to P. iiarvus, 

 cnly that the winged portion of the peristome is far more fully 

 developed and folded round into a perfect, largely developed tube 

 with its internal oi'ifice just within the aperture, the inner lip 

 being deeply notched to give room for it. The shell is ornamented 

 with a single black peripheral band and with minute transverse 

 brown zig-zag markings. Apex very flat. Whorls 5, rounded. 



" The largest example measures — alt. 0'26 [6 mm.], major 

 diam. 0*95 [24 mm.], minor diam. 0*75 [19 mm.], apertural tube 

 0"20 inch [5 mm.]."' {Godwin- Austen.) 



Hah. India: Dafla Hills, Xaga Hills, Assam (G'oc??Mu-^Msfe/i). 



The following additional details are given by Nevill, who con- 

 sidered it doubtfully more than a well-defined variety of P. parvus. 

 The compressed last whorl, which is semi-detached at the pro- 

 portionately smaller aperture, the more open umbilicus and the 

 different character of the "tube"' distinguish this form from the 

 large variety of P. parvus. 



Pterocyclus magnus, var. 



Ptcrocychs magnus, var., Godwiu-Austen, Rec. Ind. Mus. viii, 

 1915, p. 500. 



"A single specimen, with peristome not quite perfect and 

 surface in poor condition, was sent me by officers of the Survey 

 with the Miri Mission. It comes nearest to the above Dafla Hill 

 shell in general form, the markings differ considerably. Major 

 diameter 24*75. It should be looked for again." {Godwin- Austen.) 



151. Pterocyclus marionse, Preston. 



Pterocyclus marioncc, Preston, Proc. Malac. See. xi, 1914, p. 22, 

 text-fig. 



Original description : — " Shell somewhat orbicular, moderately 

 depressed, covered with a thin, laminiferous, reddish-brown 

 periostracum ; whorls 4|, regularly increasing, the last very 

 obtusely angled at the periphery, and possessing a short, but 

 rather broad, wing-like development just behind the labrum ; 

 suture very deeply impressed ; umbilicus wide, deep ; labrum 

 reflexed, white, laminiferous, continuous but for a slight break 

 below the wing-like projection; aperture circular; operculum 

 corneous, convex above, with central nucleus, bearing several 

 raised, more or less foliaceous laminse, which are especially strong 

 towards the outer margin, below concave, polished, shining. 

 Alt. 8, diam. maj. 20, min. 1 5 mm. Aperture : alt. 7, diam. 7 mm." 

 {Preston.) 



Hah. India: Katra Hills. 



