Occasional Papers of the Museum of Zoology 17 



Whorls Height Maj. Diam. Min. Diam. 



H. c. conccntr'ica /^Vi 6.0 167 (lo.o) 133 (8.0) Pfr. (1852). 



AV2 6.5 138 ( 9.0) 123 (8.0) A. J. Wagner, (1905). 



H. c. pand'xcy\sis 5 6.5 139 ( 9.0) 115 (7.5) A. J. Wagner, (1905). 



H, I, b, 35 5 5.9 i-i (lo.i) 149 (8.8) Estaci6n Tachira. 



5 6.4 170 (10.9) 140 (9.0) 



H, II, bd, 40 5 6.2 156 ( 9.7) 134 (8.3) La Fria. 



5 6.6 144 ( 9.5) 124 (8.2) 



5 7-1 151 (10.7) 128 (9.1) 



5 71 159 (11-6) 138(10.3) 



5 7-5 144 (10.8) 126 (9.4) 



5 8.0 153 (12.3) 131(10.5) 



The radular formula of H. conccntr'ica is given in another 

 paper (1922), and is figured here (fig. iv-15). A surprisingly 

 large number of forms, apparently belonging to this group, 

 have been described from the northern Andes. 



Helicina {Tristramia Angulata) rhynchostouia crnesti von 

 Martens (1873), ^^^*^ approaching var. infcsta A. J. Wag- 

 ner (1905). 



Twenty-five specimens ; San Esteban, Palma Sola, and Bo- 

 queron^ from leaves of vegetation and in rich humus on the 

 ground (aestivating), in mountain and lowland forests (H, I, 

 b, 7; II, bd, 20, 27, 28). This species appears to be more 

 truly arboreal than is H. tamsiana, and is usually found farther 

 from the ground. 



The shape of these specimens is quite variable. The basal 

 callus is rather light, and is bounded by a distinct sulcus. The 

 basal angle of the peristome is either rounded, or thickened so 

 as to be quite angvilar. The spiral lines may be deeply im- 

 pressed and numerous, or almost absent. The color is usually 

 lemon yellow, with a pinkish purple band above and below the 

 thread of white on the carina. 



