25 
Cypra#a Levcostoma. Cyp. testd ovatd, ventricosd, fusco-cinered ; 
lateribus maculatis, macula magné irregulari dorsali castaned, 
lineé dorsali pallida percurrente ; marginibus rotundatis crassis ; 
extremitatibus posterioribus crassis prominentibus dextro precipue, 
anticis convergentibus ; basi rotundatd, albicante margine interno 
labit nonnunquam obtuse dentato, columella edentuld. 
Shell ovate, gibbous, smooth; of a brownish ash-colour, spotted 
on each side with darker spots, the general ash-brown colour on the 
sides declining in intensity ultimately to whiteness ; a large chestnut- 
brown, irregular, splashed, or dotted spot on the dorsum; in some 
instances more confined and small; where the spot is deepest coloured 
and largest, the ground on which it is formed is nearly white ; poste- 
rior part of the dorsum irregular, slightly tuberculated, dorsal line 
marked, nearly white (and in some instances appears both anteriorly 
and posteriorly to bifurcate), diverging anteriorly towards the colu- 
mellar side; base white, roundish: aperture rather wide, flexuous, 
columellar groove on the anterior half of the shell; the porcelain 
covering on the gibbous portion of the columella extremely thin; 
columella smooth : teeth generally but slight denticulations; some- 
times more perceptible on the lip : extremities, posterior, much pro- 
duced, very obtuse, wide apart, columellar beak divergent ; anterior, 
rather thick, converge at their points towards each other: margins 
round, light-coloured or white, spotted to the base; outer margin 
sometimes uneven, or somewhat nodulated: spire, in all the speci- 
mens I have seen, quite covered and obliterated: colour, internally, 
light grayish blue. Axis 14 inch; diameter 1% inch. 
Hab. Mocha. In the collection of Mr. Gaskoin, Cuming, &c. 
This shell approximates in general appearance to Cyp. Mus. Some 
years ago one of this species (/eucostoma) came accidentally into 
my possession, which on comparison I found incompatible with Mus ; 
and shortly afterwards another, which warranted the distinctive no- 
menclature. Mr. Sowerby has lately obtained five other specimens, 
and with them fortunately a knowledge of their locality, which I 
have quoted. These are now dispersed in the cabinets of Messrs. 
Harford, Cuming, Stainforth, Norris, and Miss Saul ; two others are 
known to be in the cabinet of Mr. Owen at Manchester. 
This species differs from Mus in being more gibbous; in the pro- 
minent and very blunted posterior extremities, the base and aperture 
being white; denticulations but very slightly indicated, or absent, 
and always white. 
I have named this Jeucostoma, in contradistinction to that which 
it most nearly resembles, the Cyp. Mus, with its dark-coloured aper- 
ture. 
Mr. Fraser exhibited and described a new species of Bat, belong- 
ing to the genus Rhinolophus, and four new species of Birds from 
Western Africa. 
Rurnotornus Martini. Rhin. auribus magnis apud frontem inter 
se spatio angusto sejunctis ; rostro fossd oblongd superne, antice 
quatuor appendiculis carneis, vir elevatis (duobus utringue), tectd : 
