INTRODUCTION. 1x 
During recent years additions to the Mexican land and freshwater shells have 
been contributed by several North-American travellers, see Pilsbry in the ‘ Proceedings 
of the Academy of Natural Sciences of Philadelphia, 1891, p. 310, 1892, pp. 153, 338, 
and 1899, p. 391; and Dall, in the ‘ Proceedings of the United States National 
Museum,’ xviii. (1895) p. 1, and xix. (1896) p. 333. 
GUATEMALA. 
The first collector of land and freshwater shells in Guatemala and the adjacent 
regions was ArtuuR More et, born at Dijon, France, in 1809, who travelled, mostly 
on foot, in 1847, in Yucatan, Tabasco, Vera Paz, and Guatemala, visiting the ancient 
ruins of Palenque and the Lake of Itzd (see A. Morelet, ‘ Voyage dans l’Amérique 
Centrale,’ 1857, in two volumes, 8yvo, and the obituary notice of him by H. Drouet, 
Dijon, 1893). He published two papers, containing descriptions of new species, under 
the title ‘Testacea Novissima,’ 1849 and 1851, including also Cuban forms. I am 
indebted to him for the opportunity of seeing and examining some of them, chiefly the 
smaller-sized critical species of Streptostyla, Helix, Hyalinia, and Guppya. After his 
death, on Oct. 9th, 1893, the whole collection passed into the possession of the British 
Museum, when E. Smith was kind enough to compare some of his freshwater types 
on behalf of this work. 
Ospert SaLvin, M.A., F.Z.S., collected land and freshwater shells in Guatemala 
in 1857, and again in 1861-62. A list of those found by him was given by Canon 
H. B. Tristram in the ‘Proceedings of the Zoological Society of London’ for 1861, 
pp. 229-233, 1863, pp. 411-413, seventy-nine species being enumerated altogether. 
In the second part of this paper it is stated that most of the species mentioned in the 
first list were found in the immediate neighbourhood of Duefias, near Antigua (S.W. 
Guatemala), and that those enumerated in the second list were chiefly from the district 
of Vera Paz and the Lake of Peten (N. Guatemala). Subsequently, Salvin sent me a 
number of Guatemalan shells for determination, and I gave a (third) list of them in the 
‘ Proceedings of the Zoological Society ’ for 1875, pp. 645-647, thirty-two species being 
noticed. Through his kindness I have also had the opportunity of examining many of 
the types of those described by Canon Tristram. 
Dr. Orto Stout, of Ziirich, Switzerland, travelled in Guatemala in the years 1878-83. 
He has written an interesting work entitled ‘Guatemala, Reisen und Schilderungen’ 
BIOL. CENTR.-AMER., Terr. and Fluviat. Mollusca, May 1901. b 
