268 F. Stoliczka — On the Cyclostomacea of Penang. [No. 3, 
Megalomastoma sectilabbttm, Gould. PI. X, Fig. 13. 
Penang specimens agree with those from Tavoy in having a smaller 
aperture and a slightly slenderer spire, with somewhat convex sides, while in 
M. anostoma from Borneo the spire is more regularly conical and the aper- 
ture larger. 
Animal blackish grey with a slight ‘reddish tinge ; the edges of the 
foot, including the posterior end and the tentacles are vermilion, tips of 
rostrum pale grey. The length of the foot equals about three fourth of 
that of the shell when the animal moves about ; the entire body is rather 
distinctly warty, but no well defined pedal row exists ; the rostrum is 
adpressed to the foot, strongly wrinkled and cleft at the end ; posterior 
end of foot obtusely pointed, eyes small, the bulgings united at their bases 
to the tentacles. The mantle is pale, entire, closely attached to the 
peristome of the shell, and not protruding beyond it. 
Operculum horny, circular, composed of several spiral layers arranged 
round a slightly thickened or mammillated centre so that the width of each 
lamina equals the radius of the whole operculum. This structure is some- 
what peculiar, it agrees with that of the South Indian Cataulus recurvatus, 
but not with that of the other Oatauli or Megalostomata examine# ; in all 
these the operculum is distinctly multispiral. 
The species occurs at elevations from 400 to about 2400 feet on the 
Penang hill, but it is evidently a very scarce shell ; I found only one live 
specimen at the top of the hill. 
Pam. — DiraoHMATnaDJE. Sub-fam. Aivc^rra. 
Alycjetts gibbosities, n. sp. PI. X, Fig. 14. 
A. testa gibboso turrita, anguste umbilioata, violaceo rubente, ultimo an- 
fractu pallidiore, lutescente, apice albescente ; anfractibus quinque, valde 
convexis, sutura profunda et simpliei junctis ; primo Icevigato, tribus sequen- 
tibus transversim densissime striato-costellatis atque spiraliter striatis, 
ultimo gibbose injlato, paulo distinctius costellato, prope aperturam breviter 
sed valde constricto, sub-lcevigato, vix dejlexo , post constrictionem tubulo 
tenui, circiter duo ad tres m.m. longo, nonnunquam fere immerso, instructo ; 
apertura circulari, modice lata , in adolescentibus margine simpliei undique 
expansiusculo circumdata, in adultis bilabiata, labio interna extus tubuli- 
forme producto, crassiusculo, externo dilatalo atque tenui. Operculum 
solidum, latere inferno corneo, convexiusculo, medio submammillato, multi- 
spirato, impressione musculari transverse ovata atque excentrica instructo, 
externo calcareo, concavimeulo, in superficie irregulariter rugoso. Diam. 
maj. 9 '2, diam. min. 7, alt. testes 9'6 ; diam. apert. int. 3'S, externa - 4'8 m.m. 
In general character this interesting new species closely resembles the 
type of the genus, Al. gibbus, F6\, but the latter conspicuously differs by 
