Occasional Papers of the Museum of Zoology i 9 



Hcliciiia {Tristraiiiia Tainsiaiia) tamsiana Pfr. (1850), and 

 approaching var. appitiil von Martens (1873). 



Eighty-two specimens ; San Estehan, Palma Sola. Aroa, and 

 Boqueron, from leaves of vegetation and from ground (aesti- 

 vating), usually in rich leaf mould, in the mountain and low- 

 land forests (H, I, ab, 2, 5, 23; II, bd, 20, 22, 28). 



The sculpture of this species consists of fine, regular, close- 

 ly-spaced growth-lines, crossed by numerous, fine, spiral lines, 

 which are usually very regular in arrangement. The consid- 

 erable color variation may be analyzed as follows : 



a. Apex : golden yellow to creamy white. 



1). Peristome : white. 



c. Basal callus : whitish. 



d. Ciround color: (i) fulvous, varying to reddish orange 

 (typical form); (2) greenish yellow; (3) creamy white. 

 Stripes are absent with the first class of ground color, present 

 or absent with the second, and present with the third. 



e. Pattern: (i) Darker shading on apical side of whorls; 

 when brown, this may form a distinct, dark band or be light 

 and diliuse; when greenish yellow, it is always the latter. 



(2) The band of (i) may be narrowed by the i)resence of 

 a creamy white band, just below the suture (very common 

 form ) . 



(3) .\ slight infuscation may be present on the I)ase, so as 

 to mark (jIT a narrow, light band around the greatest convexity 

 of the last whorl. 



The relative numbers of the different color forms vary with 

 the locality. In one or two places, all of the shells collected 

 were of a single form, but, in other localities, all of the kinds 

 occurred together. 



