96 GASTROCOPTA, SOUTH AMERICA. 



This species is clearly distinct from G. pazi, and also from 

 the species described from the Galapagos, though G. munita 

 (Reibisch) approaches it. G. riograndensis differs by its well- 

 developed crest behind the lip, wolfii having only the trace of 

 a crest or none. 



32. GASTROCOPTA MUNITA (Reibisch). PI. 19, figs. 1 to 7, 8, 

 10, 11. 



Shell deeply rimate, ovate-cylindric, with obtuse apex ; thin, 

 diaphanous, smooth, opaque, pale corneous or whitish. Suture 

 moderately deep. Whorls 5 to 5%, convex. Aperture sub- 

 vertical, rounded, calloused; a bituberculate entering fold on 

 the parietal wall of the aperture, another simple, somewhat 

 receding one on the columella, as well as 4 smaller denticles 

 within the outer lip, which, however, are often lacking, ex- 

 cepting the one opposite the parietal lamella. The broad 

 peristome is reflected and the margins are connected by a 

 rounded callous. Length 2.5, diam. nearly 1.5 mm. Aper- 

 ture 1 mm. long, nearly 1 wide (Reibisch). 



Galapagos Islands : Albemarle, on shrubs near the seashore 

 (Wolf) ; Tagus Cove on leaves of Croton, and near Iguana 

 Cove at 2000 ft.; also Narborough Island (Snodgrass and 

 Heller). 



Pupa (Leucochila) munita REIBISCH, Abhandlungen der 

 Naturw. Ges. Isis, in Dresden for 1892, p. 27, pi. 2, f. 9. 

 Pupa wolfii Miller, DALL, Proc. A. N. S. Phila., 1896, p. 446, 

 pi. 17, f . 14 ; 1900, p. 94. Pupa pfeifferi BOETTGER, Concholo- 

 gische Mittheilungen, i, 1881, p. 68, pi. 12, f. 18. Not Pupa 

 pfeifferi Krauss (prior to 1848). 



' ' The species stands very near Pupa wolfii Miller, which is 

 abundant in the province Guayaquil, Ecuador" (Reibisch). 



This species differs constantly from G. wolfii, in a great 

 number examined, by the more convex outline of the spire, 

 which is wider in the upper part, and by the much thickened 

 or labiate peristome. G. wolfii tapers more regularly, the in- 

 dividual whorls are more convex, and the peristome is thin. 

 Other differences are that munita usually has a much stronger 

 (though variable) crest behind the lip, and generally there is 

 an interpalatal plica, which is lacking in wolfii so far as seen. 



