15 
or 
but the peculiarity of the ribs and colour of the apertures readily 
distinguish them. 
18. Puos cytuenorpes, A. Adams. PP. testd ovatd, albido- 
fused, spird acutd, longitudinaliter plicato-costatd, costis su- 
perné nodosis, ad suturam evanidis, lineis impressis transver- 
sis sulcatd ; columella plicd antied, valde productd ; labro in- 
tus fusco lirato. 
Hab. ww insulis Philippinis. 
19. PHos cyanostoma, A. Adams. PP. testd elongaté ovatd, 
acuminatd, albidd, anfractibus rotundatis, costatis, costis cras- 
sis, equalibus, infra suturam plicato-nodosis, cingulis elevatis, 
transversis, subdistantibus, interstitiis longitudinaliter subtilis- 
simé striatis ; aperturd cyaneo tinctd ; columelld tuberculatd, 
plicd anticd validd. 
Haé. 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. Puos txvicatus, A. Adams. P. testd elongate ovata, levi- 
gatd, pallide fuscd ; anfractibus subrotundatis, costatis, costis 
crassis, distantibus, levigatis, infra suturam valdé nodosis, 
lineis tenuibus transversis ornatis ; columelld plied anticd pro- 
ductd; labro extus plicato, plicis numerosis confertis, intus 
substriato. 
Hab. Promontorium Bonz 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. Kexaart, M.D., F.L.S. 
Order PRIMATES. 
Fam. Sim1aDZ. 
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 sinicus, Desm. The Rillowwah or Green Monkey. 
