290 Zoological Society. 
a scalloped appearance at their edges, from the crowded sublamell 
imbrications which cover the entire surface. . 
Osrrea Bicotor. Ost. testd obovatd, nunquam elongatd, subtenui 
aut solidiusculd, subcompressd, vix lamellosd, purpureo-fuscescente 
radio uno vel radiis duobus albidis ornatd; margine simplici ; 
natibus subacutis ; superficie internd, albidd colore externo margi- 
natd ; cardine denticulis nullis munito. Long. 2} poll. 
Hab. Senegal? Mus. Cuming, Hanley. 
As the few specimens I have yet examined of this elegant species 
have been attached by the entire surface to the sheathing of vessels, 
I am unable to describe the characteristics of the lower valve. The 
lamelle, when existing, are flattened, so that the shell presents a 
smooth surface, and appears inclined to expand laterally whenever 
unobstructed in its growth by adjacent substances. 
OsTREA COLUMBIENSIS. Ost. testd subinequivalvi, subtenui, lamel- 
losd, albidd, purpureo radiatd, subcompressd ; valvuld inferiore 
magis converd; superficie internd albidd, submargaritaced ; car- 
dine denticulis nullis munito ; cicatrice satis magnd, reniformi. 
Long. 2 poll. 
Hab. St. Elena, West Columbia, adhering to rocks at half-tide 
(Cuming). Mus, Cuming. 
All the specimens I have seen are attached by the entire surface 
of the lower valve. The shape varies from oblong to suborbicular, 
and the valves are of equal length, but the shelly substance of the 
shallow upper valve fits into the lower one, and is only continued to 
the margin by the lamelle, which, when the habitat permits, branc 
into wavy foliations. 
Ostrea CaLuicuroa. Ost. testd obovatd aut suborbiculari, solidius- 
culd, subequivalvi ; valvuld superiore purpureo alboque lutescente 
radiatd, concentricé lamellosd ; lamellis depressis ; valvuld inferiore 
magis minusve purpureo tinctd, costisque radiantibus subobtusis 
dens? armatd ; superficie internd, albd ; margine simplici ; cardine 
denticulis distinctis munito. Long. 2 poll. 
Hab. Island of Chiloe, adhering to stones at low-water mark 
(Cuming). Mus. Cuming. ‘ 
The general appearance is that of our edible oyster, but the colour- 
ing is magnificent. : 
October 28.—George Gulliver, Esq., F.R.S., in the Chair. 
A paper was read containing ‘‘ Descriptions of new species of 
Shells,’’ by Lovell Reeve :— 
Morex macusatus. Mur. testd ovatd, subpyramidali, anfractibus 
brevibus, tuberculato-varicosis, varicibus interstitiisque subtiliter 
liratis, liris, lirarum interstitiis quoque pulcherrime fimbriato- 
cancellatis ; albidd, maculd rubido-fuscd inter varices conspicue 
tincté ; columelld et aperture fauce pallide rosaced ; canali bre- 
viusculo, recurvo, 
Hab, ——? 
