7 
The greater number of them are in the collection of the British 
Museum. Like all naturalists visiting this country, I feel myself under 
great obligations to Dr. J. E. Gray and to H. Cuming, Esq., who with 
their usual liberality have given me free access to their collections. 
J. LAND-SHELLS. 
The only notice of a Siamese land-shell recorded by earlier authors 
is to be found in Argenville’s ‘ Conchyliologie,’ third edition, by Fa- 
vanne, figure C 1 of plate 64 of this work representing a shell called 
la Siamoise, which it is difficult to indentify with any known species; 
Nicolson (Essai sur I’ Histoire Naturelle de lisle de St. Domingue, 
1776) and Lamarck are very probably wrong in quoting it asa Haiti 
shell, Helix undulata, Fér. From that time, so far as I know, no 
land. or freshwater-shell has been mentioned as from Siam, until 
the shells collected by Dr. House were described by Redfield and 
Haines (in the sixth volume of the Annals of the Lyceum of Natural 
History at New York, 1853-1855) and by Dr. Pfeiffer (in the Pro- 
ceedings of this Society, 1856). I shall mention them in the follow- 
ing list at the proper place. 
HELICcEA. 
Virrina SIAMENSIS, Haines, Ann. Lyc. N. H. New York, 1855, 
vi. p- 158. 
Diam. maj. 30, min. 25, alt. 15 mill. 
Leg. House, 
Nawnrna pistincta. Pfr. Mon. iii. p. 81; Reeve, Conch. Ic. Hel. 
no. 465. 
' Leg. House et Mouhot. 
This species and Cyclophorus siamensis ave the largest land-shells 
known at present from Siam ; it seems to be common there, because 
there are several of this species among the shells collected by Mouhot, 
and Dr. Pfeiffer had seen and described one some years before House 
or Mouhot were in Siam. 
NANINA BIRMANA, Pfr. 
Pale yellowish, with a reddish band, the whorls slowly increasing. 
Diam. maj. 26, min. 23, alt. 15 mill. 
Leg. Mouhot. 
Nanina HAtnEst!, Pfr. Mon. iv. p. 61; Novitat. pl. 18. f. 7-9. 
This shell is similar to the preceding, but may be distinguished 
by the whorls being more raised, and by the want of any band. They 
are both faintly decussated, and their suture is slightly crenulated, 
and of a pinkish-violet hue. 
Diam. maj. 30, min. 26, alt. 16 mill. . 
Leg. House et Mouhot. 
