155 
but the peculiarity of the ribs and colour of the apertures readily 
distinguish them. 
18. Phos cyllenoides, A. Adams. P. testa ovatd , albido- 
fused , spied acuta , longitudinaliter plicato-costatd, costis su~ 
perne nodosis, ad suturam evanidis, lineis impressis transver- 
sis sulcata; columella plied antied, valde produetd; labro in- 
tus fusco lirato. 
Hah. in insulis Philippinis. 
19. Phos cyanostoma, A. Adams. P. testa elongate ovatd , 
acuminata , albidd, anfractibus rotundatis, costatis, costis eras- 
sis, cequalibus, infra suturam plicato-nodosis, cingulis elevatis, 
transversis, subdistantibus, interstitiis longitudinaliter suhtilis- 
sime striatis; aperturd cyaneo tinetd; columella tuberculatd, 
plica antied validd. 
Hab. in insulis Philippinis. 
The interstices between the transverse ridges in this species are 
very beautifully engraved with fine longitudinal lines, and the aper¬ 
ture is tinged with blue. 
20. Phos l^evigatus, A. Adams. P. testa elongate ovatd, Icevi- 
gatd, pallide fused; anfractibus subrotundatis, costatis, costis 
crassis, distantibus, Icevigatis, infra suturam valde nodosis, 
lineis tenuibus transversis ornatis ; columella plied antied pro¬ 
duetd ; labro extus plicato, plicis numerosis confertis, intus 
substriato. 
Hab. Promontorium Bouse Spei. 
A large, smooth shell, with thick, simple ribs. 
June 25, 1850. 
William Yarrell, Esq., Vice-President, in the Chair. 
The following papers were read :— 
1. Catalogue of the Mammalia of Ceylon. Collected 
and observed by E. F. Kelaart, M.D., F.L.S. 
Order Primates. 
Fam. SiMiADiE. 
1. Presbytes cephalopterus, Gray. The Nestor or Purple-faced 
Monkey. 
2. Presbytes Thersites, Blyth. The Wanderoo of Ceylon. 
3. Presbytes Priamus, Elliot. The larger Wanderoo. 
4. Simia siincus, Desm. The Rillouwah or Green Monkev. 
