1012 
MALAYSIAN LAND AND FRESHWATER MOLLUSCA, 
Family VITRINOIDEA. 
5. Nanina, Gray, 1834 ; Pfr. Sym. I, p. 5, No. 3. 
Shell heliciform, perforated, dextral or sinistral, somewdiat 
depressed, thin, polished, particularly below ; periphery round or 
keeled, inner lip short, reflected, often covering the umbilicus ; 
outer lip simple or scarcely reflected. 
Animal with two mantle-lobes covering part of front of shell ; 
foot long, narrow, truncate behind, with a pore like a slit, some- 
times with a projection like a horn ; mantle-lobes with power to 
expand and retract laterally. Over 500 species ; tropical and 
sub-tropical Africa, Asia, and Oceanica. 
N. viRiDis, Quoy and Gaimard, (as Vitrina), Voy. Astrol. II. 
p. 138, pi. 11, figs. 16-18; Lamarck, Deshayes edit. VII. p. 730, 
No. 7 ; H. Beck, Index II. p. 4 \ = Helix viridis, Pfr. Mon. Hel. 
I. p. 82. 
Island of Celebes in the mountains near Menado, is the refer- 
ence given by Q. and G. This part of Celebes, it will be remem- 
bered, is the only active volcanic portion. 
N. Lowi, Issel, = Hyalina (? ) lowi, Issel, Moll. Born. p. 38, 
pi. 5, figs. 16-18 ; = lov)i (Hyalina?), Pfr. Mon. Hel. VII. 
p. 523. 
Sarawak, Borneo. 
N. TERSA, Issel, ( MacrochlamysJ, Moll. Born. p. 36, pi. 5, 
figs. \-i = Helix (Nanina) tersa, Pfr. Mon. Hel. VII. p. 525 = 
Nanina tensa, Pfr. Nomencl. Hel. p. 37, No. 222a. 
Borneo. 
N. PERLUCiDA, Issel, (Hyalina?), Moll. Born. p. 39, pi. 5, 
figs. ‘Ni-IZ = Helix perlucida, Pfr. Mon. Hel. VII. p. 526. 
Bintulu, Sarawak, Borneo. 
N. MACDOUGALLi, Issel, Moll. Born. p. 37, pi. 5, figs. 9-12 = 
Helix macdougalli, Pfr. Mon. Hel. VII. p. 526. 
Sarawak, Borneo. 
