302 VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
Hartman, writing in 1881, speaks of producta as a terrestrial species, that “may 
be confused with dextral banded P. otaheitana without a pillar tooth.” The details 
of the coloration are such as to make identification always certain, while the form 
and proportions are so distinctive as to be sure criteria for both the unbanded and 
banded shells. ‘The species is readily distinguishable from the dextral mutants of 
P. otaheitana sinistrorsa, which occur in this valley in small numbers, as we have seen. 
Garrett’s descriptive account (pp. 66, 67, loc. cit.) is as follows: 
“The type is yellowish fulvous, and invariably marked by three narrow, revolving, 
reddish brown bands in the body-whorl, and two on the spire. The rather narrow, dull 
whitish peristome is moderately reflexed, rounded, and the margins united by a layer of 
callus on the parietal wall, which latter is edentate. It is always dextral, and the rather 
long spire equals half, or a trifle more than half, the length of the shell. 
“Var. a. Body deep chestnut-brown, with or without a pale sutural band, pale base 
and bilineated spire. 
“Var. b. Uniform pale fulvous or tawny, with a darker apex.” 
Pilsbry gives a full description in his classic work, which is as follows: 
“The shell is dextral, long-ovate, deeply rimate, rather solid, moderately glossy; 
yellow or brownish-yellow with three dark chestnut bands, a pale sutural band above the 
upper one, the middle band widest, the lower one defining a light umbilical patch; whorls 
of the spire showing two dark bands on a light or flesh-colored ground, apex dark. The 
surface shows no spiral lines, or only faint traces of them. Whorls 514, moderately convex, 
the last well rounded peripherally and beneath. ‘The aperture is nearly vertical, dark 
within; peristome narrowly expanded and reflexed, moderately thickened within, white or 
flesh-tinted. The parietal wall is typically toothless, but sometimes it bears a tubercular 
white tooth. 
“Length 20, diam. 10.7, aperture 10 mm. 
“Length 19, diam. 10.2, aperture 10 mm. 
“Length 21, diam. 11.2, aperture 10.8 mm. 
“VLength 18.8, diam. 10, aperture 9.8 mm.” 
The material in hand is scanty. Only 29 living adults and 3 adolescents were 
collected, as well as 14 “dead” shells of adult growth that may be used in the statis- 
tical analysis. In examining the collections in the museums of Honolulu, and of 
various places in America and Europe, some two score shells were studied, all of 
which agree with the material obtained personally. 
The color-form regarded as typical is that which displays three distinct revolv- 
ing bands upon the body-whorl (plate 34, figs. 57 to 59). The bands themselves are 
regularly spaced; the median element corresponds in position with the middle stripe 
in affinis dubia and zonata, and others, but the lateral markings are nearer to the 
morphological sagittal plane than in the varieties of otaheitana. As a consequence, 
the sutural zone of the body-whorl and of the apical coils, as well as the extreme 
basal or umbilical region of the last whorl, exhibit the ground-color. Upon the 
spire, the “basal” band is covered, and therefore only two elements are displayed. 
It is noteworthy that in s7nistrorsa cestata the sutural band is in contact with the 
whorl next above, which affords a sharp contrast with the producta condition. 
