128 Mr. E. A. Smitli on some 



XIX. — Notes on some Land-Shells from Vatihu, TonJcin, 

 with Descriptions of Tivo new Species. By Edgar A. 

 Smith. 



Helicarion siamensisy Haines. 



Vitrina siamensis, Haines, Pfeiffer, Mod. Hel. vol. iv. p. 158, 

 Helicarion Paviei, Morlet, Journ. de Conch. 1889, p. 174, pi. vi. fig. 1. 



Hah. Siam {Haines) ; Cambodia (Morlet). 



The specimens from Vanbu, Tonkin, are as large as those 

 described by Haines and Morlet. The former does not 

 mention the feeble spiral striation, but, in his brief diagnosis, 

 he may have considered it scarcely worth noting. Specimens 

 in the Cuming collection, obtained by Morlet in Cambodia 

 and identified by Pfeiffer as siamensis, agree with the Tonquin 

 shells. 



Nanina distincta, Pfeiffer. 



Helix distincta, Pfr. Conch.-Cab. ed. 2, pi. cxxxiv. figs. 1, 2 ; Reeve, 



Con. Icon. fig. 465. 

 Nanina dii^tincta, Martens, Preuss. Exped. Ost-Asien, Zool. vol. ii. 



p. 69. 

 Var. = ^. Neptunus, Pfr. Novitat. Conch, vol. ii. p. 176, pi. xlviii. 



figs. 1, 2 ; Tryon, Man. Conch, ser. 2, vol. ii. p. 34, pi. viii. fig. 27. 

 \eLV. = H.pluto, Pfr. Novitat. Conch, vol. ii. p. 210, pi. iv. figs. 8, 9 ; 



Tryon, Man. Couch, ser. 2, vol. ii. p. 37, pi. xii. fig. 56. 



Hab. Siam, Camboja. 



Two forms of this species, both smaller than the type or 

 the variety pluto, are in the present collection from Tonkin. 

 In the first (var. funerea) the shell is of an almost uniform 

 purplish-black tint, redder towards the apex, the suture being 

 sometimes indistinctly mai-gined with yellow. The peristome 

 is yellowish and a former lip is also visible at a considerable 

 distance from the aperture. The body-whorl is not quite so 

 inflated below the keel as in the var. pluto or the type. The 

 largest specimen is 53 millim. in its greatest diameter, and 

 appears to be adult. 



The second variety (var. pallidior), of about the same size, 

 is yellowish or olive-yellow, with a broad brownish-black 

 band below the periphery and distinctly visible within the 

 aperture. In both these varieties the umbilicus is rather 

 narrower than in the typical form from Siam or the var. 

 pluto from Camboja. If the form pluto, an intermediate link, 



