i6 University of MicJiigan 



Hcliciiio {Trisframia O.ryrJioinbiis) coiicciitrica Pfr. (1849), 

 and ai)proaching var. paiidieusis A. J. Wagner ( 1905 ). 



Sixty-eight specimens ; Estacion Tachira and La Fria, from 

 leaves of trees, palms and shrubs, and from the ground ( aesti- 

 vating), mainly in rich humus, but also in the root mould (11, 

 I. abd, 35, 42. 43 ; II, bd, 40, 43). 



The ty]:)e locality of H. conccntrica conccntrica is near Merida, 

 \'enezuela (L 8, 71). while that of H. c. pandicnsis is Pandi, 

 Colombia (L 4, 75). These lots, from an intermediate region, 

 contain specimens that appear to be very close to both of these 

 subspecies. The growth lines are rather widely spaced ; under 

 the lens, all of my specimens also show fine, anastomosing lines, 

 which tend to run spirally. In addition, a few obscure, but 

 quite regular, spiral fiUTOws are usually, l)ut not always pres- 

 ent, both on the apical and basal sides of the whorls. The 

 thread carina is usuallv sharp. The columellar angle of the 

 peristome is usually rounded, but is often quite sharply angu- 

 late. The smooth apex is greenish to golden-yellow in color; 

 the callus, peristome, and the edge of the carina are whiti^h to 

 yellowish. The ground-color varies, in the series, from light, 

 chestnut brown to lemon yellow ; it is often darker towards the 

 carina and sometimes is liroken b}- obscure, spiral bands or 

 lines. As shown ])y the measurements, this species shows con- 

 siderable variation in size and shape. Some of the specimens 

 have a slightly scalariform tendency. The specimens from 

 Estacion Tachira are small and depressed. 



