753 
sammenhängend. Deckel hornig, dünn, die Ränder der neun Windungen kielartig 
vorspringend. 
Aufenthalt bei Loeboek ßangko auf Sumatra. Abbildung und Beschreibung 
nach Bullen. 
42. Pterocyclus magnus G Austen. 
Tat. 112. Fig. 3. 4. 
This shell is similar in form to Pt. parvus, only that the winged portion of the pe- 
ristome is far more fully developed and folded round into a perfect largely developed tube 
with its internal orifice 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 ziczag markings. Apex very Hat, 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). 
Pterocyclus magnus Godwin- Austen, Cyclost. Dafla Hills, in: Journal Asiat. 
Soc. Bengal 1876 p. 173 t. 7 fig. 3. — G. Nevill, Handlist Moll. 
Indian Museum, 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 Nägä 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 cyclophoroideus 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 Cyclopnorus steno- 
stoma Sowerby, both in form and colouration; it can be distinguished at a glance by the 
apparently constant absence of the conspicuous band 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 nmch raised, concave operculum, whilst on the other hand in my 
single operculated specimen of Pt. nanus it is only sligthly raised, scarcely concave etc. 
Alt 8 3 / 4 , diam. 16 mm. 
I. 19. 
13. X. 1910. 
96 
