BY- C. HEDLEY. 71 



This fine shell, the largest yet discovered in New Guinea, is, 

 with the following species, closely allied to iV. dorice, T.-C, and 

 probably to //. achilles, Braz. Unfortunately my specimens 

 consist only of dead shells, and as Tapparone gives no anatomical 

 characters, the generic position of the group remains a matter of 



conjecture. 



2. 0. flyensis, n.sp. 



(Plate ix., figs. 3-4.) 

 Shell hardly perforate, solid, large, orbicularly turbinate, acutely 

 angled at the periphery, angle disappearing in the latter part of 

 the last whorl ; colour shell white, a broad black band edged 

 below with reddish-brown encircling the base beneath the 

 periphery, epidermis olive-green through which the peripheral 

 band is visible, peristome pink ; whorls 6, slowly and regularly 

 increasing, above rather convex; sculpture, first three whorls nearly 

 smooth, showing regular delicate oblique ribs under the lens, outer 

 whorls with coarse irregular oblique striae, between which are 

 microscopic waved hair lines, confusedly malleated, sculpture 

 coarser on the last whorl ; apex obtuse, apical whorls minute, no 

 definition of embryonic whorls ; suture impressed, deepening as it 

 proceeds ; base rounded, umbilical region impressed, coarsely 

 radiately striated ; epidermis glossy, deciduous ; aperture oblique, 

 angularly lunate, peristome thickened and bent inwards, the base 

 of the columella spread over almost all the umbilicus, margins not 

 connected by a callus. Diam. maj. 60, min. 49, alt. 34 mm. 



T y p e in Queensland Museum. 



H a b i t a t. — Fly River (Macgregor) ; three dead shells. 



3.* Nanina citrina, Linne, 1759. 



Illustrations. — Chem. Conch. Cab. ix. pi. 131, figs. 1170, 

 1172, 1173; Pfeiffer, Conch. Cab. 2nd ed. pi. 35, figs. 1, 2, 3 ; 

 Voy. " Astrolable," Zool. ii.pl. 11, figs. 1, 2, 3, 4; Voy. " Uranie 

 et Physicienne," Zool. pi. 67, figs. 2, 3 ; Ostas. Zool. n. pi. 6, 



* Species thus distinguished extend beyond the boundaries of British 

 New Guinea. 



