82 THE LAND MOLLUSCAN FAUNA OF BRITISH NEW GUINEA 

 28. C. MACGREGORI, ll.Sp. 



(Plate x. 5 tigs. 17-19.) 



Shell uuibilicated, discoidal, thin, translucent j colour reddish- 

 brown above, lighter beneath, peristome bright lilac, interior of 

 shell subnacreous, iridescent, gleaming bluish-white ; whorls 4J, 

 rounded, the earlier gradually the last rapidly increasing, last 

 descending considerably and gradually at the aperture and 

 furnished with the gibbosity characteristic of the genus ; sculpture 

 oblique flat-topped costse whose shallow interstices contain two or 

 three fine radiating striae, both costaa and strise are crossed by 

 minute spiral grooves ; apical whorls sunken, smooth ; suture 

 deeply impressed ; aperture diagonal, lunate, peristome widely 

 expanded above, reflected below, margins approaching, connected 

 by a thin transparent callus, columellar margin expanded over a 

 quarter of the umbilicus ; the latter narrow, deep, showing every 

 revolution of the spire, margin abruptly rounded. Diarn. maj. 28, 

 min. 21, alt. 12 mm. 



T y p e in Queensland Museum. 



Hab. — Village of Aipiana, St. Joseph River (Hedley). Dead 

 shells were seen in abundance, animals were purchased from the 

 natives. 



Dedicated to Sir William Macgregor, M.D., K.C.M.G., whose 

 zeal for science has greatly increased the world's knowledge of the 

 Papuan fauna and flora. 



Recorded from the province in error. 

 C. corniculum, Hombr. et Jacq. 



Vide Ann. Mag. Nat. Hist. (5), xi. 190, and Ann. Mus. Gen. 



xix. p. 179. 



C. dentoni, Ford, 1890. 



Vide Proc. Acad. Phil. 1889, p. 138 j " The Nautilus," m. p. 17, 

 2 woodcuts. 



Mr. Brazier assures me that this species is identical with (H.) 

 tuckeri. Pfr., Queensland specimens of which frequently possess a 



