CYCLOPHORUS.—PtatE XX. 
apertura circulari, labro paululum reflewo, superne 
tenue sinuato-alato. 
THE WINGED CycLornorts. Shell largely openly um- 
bilicated, depressed, nearly discoid, yellowish, rayed 
with chestnut blotches ; whorls narrow, rather rapidly 
increasing, rounded, transversely densely thread- 
striated; aperture circular, lip a_ little reflected, 
slightly sinuately winged at the upper part. 
Benson, Ann. and Mag. Nat. Hist. 1857, vol. xix. p. 
205. 
Hlab. Whasiah Hills, India; Theobald. 
There is little to distinguish this species from the Cey- 
lon C. annulatus, except the slightly winged lamina on the 
upper edge of the lip, indicating a passage to the Péero- 
cyclos group. 
Species 104. (Fig. a, 6, Mus. Benson.) 
CYcLOPHORUS CALYX. 
umbilicatd, depressa, subdiscoided, albidd aut lutescente, 
Cycl. testd perampliter excavato- 
castaneo radiatim maculata ; anfractibus perangustis, 
justa suturas planulatis, deinde rotundatis, sudtus ob- 
tusé angulatis ; apertura circulari, labro tenueé reflexo, 
superne obscure sinuato-alato. 
‘THE caLyx CycLopnorus. Shell very largely excavately 
umbilicated, depressed, nearly discoid, whitish or 
yellowish, rayed with chestnut blotches; whorls very 
narrow, a little flattened next the sutures, then 
rounded, obtusely angled beneath ; aperture circular, 
lip thinly reflected, obscurely sinuately winged at the 
upper part. 
Benson, Ann. and Mag. Nat. Hist. 1856, vol. xvii. 
p. 228. 
Hab. Akaouktong, India (near the shores of the Irawadi 
river) ; Theobald. 
Distinguished from the preceding species by the whorls 
being narrower, and obtusely angled round the umbilicus. 
Fig. 105. (Mus. Benson.) 
The shell here represented is Mr. Benson’s type of C. 
scissimargo, described by him in Ann. and Mag. Nat. 
Hist. 1856, vol. xvii. p. 228. It is characterized from 
having a small notch or incision at the junction of the lip 
| with the penultimate whorl. Mr. Sowerby has accidentally, 
contrary to my directions, turned away the mouth of the 
shell in the accompanying figure, so that the little notch 
is not shown. I am not, however, satisfied that this mi- 
nute marginal notch can be relied on as a specific character. 
The shell in all other respects is C. ¢riliratus, including 
Mr. Benson’s C. quadrifilosus ; and on examining several 
specimens of that species, I find in all more or less indi- 
cations of the notch. Its presence seems to depend on 
the accidents of convolution. When the last whorl is 
coiled so closely as that the body of the penultimate whorl 
forms a portion of the wall of the aperture, then the mi- 
nute notch at the junction of the lip is not readily apparent ; 
but when the aperture is more removed from the penulti- 
mate whorl, and a layer of callous matter intervenes, then 
the notch is made conspicuous. The curious feature is 
that when there is a layer of callous matter, it should 
stop short of the notch, not filling it up. 
