344 LIEUT.-COL. H. H. GODWIN-AUSTEN ON [June 18, 
margin at right angles to the hody-whorl, and at last forming a flat 
bread wing, ‘with a shallow fold near the suture. 
Size: maj. diam. 28°75, min. 21°25; alt. axis 6°5 millim. 
Operculum shelly in front, multispiral, having the appearance of 
a strand of rope coiled on itself, thin, flat, and horny on the inner 
side. 
Hah. Molu Hills (R. Hungerford). 
. CYCLOTUS TRUSANENSIS, n. sp. (Plate XXXVI. figs. 5, 5a.) 
ee discoid, very widely umbilicated ; all the whorls showing ; 
sculpture a thick epidermis, with lines of growth ; colour dark umber- 
brown, with a few small splashings of cchre ; spire flatly depressed ; 
apex searcely rising above the last whorl ; suture impressed ; whorls 
5, rounded, the last slightly descending ; aperture circular, oblique ; 
peristome double, inner simple, continuous, the outer slightly reflected, 
gradually expanding towards the margin, forming at the suture a 
small wing, which is attached to the penultimate whorl. 
Size (of shell drawn): maj. diam. 18°5, min. 15°0; alt. axis 4°5; 
diam. aperture 7°80 millim. 
Size (largest in collection): maj. diam. 22°5, min. 17°5; alt. axis 5:0; 
diam. aperture 9:0 millim. 
Operculum shelly in front, flatly concave, with a small central 
circular depression, “horny at back, surface flat. 
Hab. Trusan Island (A. Everett). 
This shell without its operculum might on a casual examination 
be referred to Péerocyclos tenuilabiatus, Metcalfe; but it may be 
distinguished from this latter by its closer Fiiiualon and by the 
last whorl not descending so rapidly. It is remarkable to find two 
shells so very similar, and yet showing so wide a difference in the 
form of the operculum. 
Pterocyclos tenvilabiatus is quite plain in coloration, while Cyclotus 
trusanensis shows bands of pale zigzag markings. 
2nd Group. Cycloti marmorati. 
Shell more or less turbinate, narrowly umbilicate, smooth, with 
marbled or fine zigzag markings. 
Cyclotus amboinensis, Pfr. 
pea amboinensis, Pfr. P. Z.S. 1852, p. 144. 
Cyclotus tee ee von Martens, Preuss. Exped. Ost-Asien, 
p- ral, pl. ii. figs. 4, 
Hab. gent In Gaming collection, Brit. Mus. 
This locality is doubtful ; von Martens gives it from the Moluccas 
onty, Amboina, Buru, &c. 
3rd Group. Cycloti suturales. 
Turbinate shells, openly umbilicate, plain in coloration, the last 
whorl slightly separated from the antepenultimate. Peristome 
simple, not reflected at all. 
