1012 MALAYSIAN LAND AND FRESHWATER MOLLUSCA, 



Family VITRINOIDEA. 



5. Nanina, Gray, 1834 ; Pfi-. Sym. I. p. 5, No. 3. 



Shell heliciform, perforated, dextral or sinistral, somewhat 

 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 w^ith a projection like a horn ; mantle-lobes with power to 

 expand and i-etract 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, Issei, = Hyalina (?) lowi, Issel, Moll. Born. p. 38, 

 pi. 5, figs. 16-18 ; = Helix lowi (Hyalina?), Pfr. Mon. Hel. VII. 

 p. 523. 



Sarawak, Borneo. 



N. tersa, Issel, ( MacrochlamysJ, Moll. Born. p. 36, pi. 5, 

 figs. l-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. 20-23 = 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. 



