4 
NANINA 
There is another Siamese species in the British Museum most 
allied to N. bistrialis, but distinguished from it by being more flat 
above ; the whorls are much more rapidly increasing, as in the two 
preceding species; the colour is pale yellowish with a rather broad 
white band, bordered on each side by a narrow brown line. As the 
specimen seems not to be perfect, I shall not venture to give it a 
new specific name. 
Diam. maj. 20, min. 17, alt. 17 mill., anfr. 43. 
Leg. Mouhot. 
NanINa sIAMENSIS, Pfr. Mon. iv. p. 60; Novitat. pl. 18. f. 1, 2. 
Leg. House. 
Nanrna (subg. Hesra) vatiicoa, Pfr. Mon. iv. p. 46. 
Whorls 53, with radiating strize near the suture. 
Diam. maj. 12, min. 11, alt. 7 mill. 
Nanna (subg. Hesta) spLENDENS, Hutt., Pfr. Mon. iv. p.124? 
Umbilicus very narrow. 
Diam. maj. 13, min. 11, alt. 7 ‘mill. 
Leg. Bowring. 
The two last-mentioned species are very brilliant, and in this re- 
spect, as well as in their size and general shape. resemble the shells 
of the genus Hyalina more than any true Nanina. It is merely 
on the authority of Hutton and Pfeiffer (v. Malakologische Blatter, 
1856) that I am induced to place them in the genus Nanina, 
Nanina (subg. TROCHOMORPHA), Sp. 
There is one specimen in the British Museum, gathered by 
Mr. Bowring, nearly allied to Helix planorbis, Less., and H. acuti- 
margo, Pfr. As Mr. Cuming tells me that he has sent specimens 
of all these Siamese land-shells to Dr. Pfeiffer, I prefer to await 
the judgment of that experienced monographer in determining the 
species. 
Hexix TOURANNENSIS, Eydoux et Souleyet, Voy. Bonite, pl. 29. 
f. 12; Pfr. Mon. iii. p. 137. 
Hevix stmivaris, Fér.; Pfr. Mon.i. p. 336. 
A rather large specimen, diam. maj. 18, min. 15, alt. 12 mill., 
with a distinct reddish-brown band. 
HEL1x PTYCHOSTYLA, Nn. 
Testa umbilicata, conoidea, solidiuscula, striata, fusca ; anfr. 63, 
convexiusculi, lente accrescentes, ultimus medio carinatus, basi 
convexus, umbilico lato, pervio; apertura securiformis ; peri- 
stoma expansum, album, margine columellari fere perpendiculari, 
uniplicato, angulum rectum cum margine basali formante. 
Diam. maj. 14, min, 12, alt. 9 mill. 
