190 oKTHAI.lrt S. 



(Stiibel). I'eru : Marnnoii (Orton). llolivia : Mi<ltllr of the 

 refil>l!<\ and m-:ir the MIXS/UH <>f ]iih<isi. _() league.-. from Santa Crux 

 de la Sierra (Orbigny). 



The thin lip and columella distinguish this species from the <>. 

 tnil/isiitiis. The typical form (tigs. ('.. 7 i is from the Guianas, wh-re 

 it is a widely-distributed and common shell. The specimens from 

 the upper Amazon drainage belong to a more oblong, darker colm-ed 

 race, noticed lielow. It is a magnificent snail, fornvrly very rare ; 

 Ferussac is said to have paid ~>M francs for his specimen, at the sale 

 of the Count de Latonr d'Auvergne. 



It is usually known as <>. gallinasultana, Chemnitz, variously 

 written as one word, compounded with a hyphen, or as two words, 

 the latter being Chemnitz's mode. It was not originally a binomial 

 name, and even those who accept it do not extend their liberality to 

 other trinomials in the same volume of Chemnitz. The first binomial 

 name is that ot Dillwyn. 



D'Orbigny distinguished two varieties : the typical form ol Guiana, 

 which is shorter, more ventricose. and another discovered by him in 

 Bolivia, which is more elongated, larger, with rive spiral /.ones and 

 black-bordered peristome. This race (pi. 17, tig. 8) which may be 

 what I 'Heifer called 15. nieo!>amben,-is, was met with by d'Orbigny 

 in the great humid forests of mid Bolivia, inhabited by the wild tribe 

 of Gnarayos. It remains deeply buried at the feet of the trees, coin- 

 ing forth upon the trunks of trees only in the rainy >e;iM>n, when 

 only it may be procured. He gives the size as <S<> mill, long, \~> 

 wide. It is apparently what llerr Stiibel collected on the Rio 

 Tocantins, described by Dr. von Martens as follows : It > is somewhat 

 more slender than the usual form from (Jnianaand Surinam, the 

 miter lip with a narrow, distinctly defined black-brown bonier inside, 

 parietal wall black-brown throughout, the upper half of the colu- 

 mellar margin white, lower half dark brown. Length 7.'!, diam. 48, 

 height of aperture Is, hre.-idth ."U mill. Approaches < >. triillisutns 

 Sluitll., but the columellar margin is thin and concaveh arched, ;is 

 in (>. i/nlliiiii sn//'it/(i." 



I'.eck attempts to disliiiL'iiish two \arieties : a, cnt/niit'iou's, liased 

 upon the ligun- i:i\en by Spix, the locality ol whi<'h i~ unknown, and 

 b, lin/iriinins, \>:\~<-(\ upon ( 'heimiit/V (iguro (which are the ba.is of 

 IV|ii>-;tl s//ii,ui ), and tln^e of l'"ci-iiac. The latter represents a 

 (iniana shell. It would seem that these two varietal names must 

 fall as pure .-\ nonyms of typical 0. su/taim. 



