753 



sammenhängend. Deckel hornig, dünn, die Känder der neun Windungen kielartig 

 vorspringend. 



Aufenthalt bei Loeboek ßangko auf Sumatra. Abbildung und Beschreibung 

 nach Bullen. 



42. Plerocyclus magnus G. Auslen. 



Taf. 112. Fig. 3. 4. 



This Shell is similar in form to Pt. parva s, only that the winged portion of the pe- 

 ristome is far more fuUy developed and folded round into a perfect largely developed tube 

 with its internal orifice just within the aperture, the inner hp being deeply notched to give 

 room for it. The shell is ornamented with a Single black peripheral band and with minute 

 transverse brown ziczag markings. Apex very flat, whorls 5 rounded. — The largest example 

 measures: alt. 0.26, major diam. 0.95; minor diam. 0.75, apertural tube 0.20. — G. Austen. 



Diam. maj. 24, min. 20, alt. 6,5, diam. apert. 9 mm. (ex icone). 



Pterocycliis magnus Godwin-Austen, Cyclost. Dafla Hills, in: Journal Asiat. 

 Soc. Bengal 1876 p. 173 t. 7 flg. 3. — G. Nevill, Handlist Moll, 

 Indian Museura, vol. I p. 201. — Kobelt & Moellendorff, Catalog, 

 in: Nachrbl. D. malak. Ges. 1897 vol. 29 p. 113. — Kobelt, 

 Cyclophoridae, in: Tierreich, Heft 16 p. 166. 



Hab. — Very common in the outer sandstone ränge, Dafla Hills. II is also 

 found in the northern side of the Näga Hills, but has hitherto never been sepa- 

 rated from P. parvus of the Naga Hills, of which it may be said to be a more 

 developed form, with stronger affinities to the genus Spiraculum. — G. A. 



43. Pterocyclus cyciophoroideus G. Austen, 



„This is a form that has hithertho been confused with Pt. nanus, Benson, the shell is 

 more depressed and of thicker substance, resembling more closely Cyclophorus steno- 

 stoma Sowerby, both in form and colouration; it can be distinguished at a glance by the 

 apparently constant absence of the conspicuous baud at the periphery. J intended, despite 

 all the above, to have merely separated it as a subspecies, when I noticed, that all my Ana- 

 mullay specimens have a much raised, concave operculum, whilst on the other band in my 

 Single operculated specimen of Pt. nanus it is only sligthly raised, scarcely concave etc. 

 Alt 8^/4, diam. 16 mm. 

 I. 19. 13- X. 1910. 96 



