PARTULA SALIFANA. ja 
The fundamental color of the species is chestnut-brown (figs. 1, 2, plate 11). 
7 of the 19 specimens are typical in ground-color (figs. 2 to 4, plate 11), but they dis- 
play more or less decortication of the first-formed whorls, which therefore become dull 
purple (fig. 3, plate 11); one of these shells possesses a deep purple apex by virtue of 
an actual pigmentation not shown in the others (fig. 4, plate 11). One individual 
among the non-decorticated adults differs in its peculiar yellowish-brown tinge 
verging toward olive-brown (fig. 1, plate 11). In 5 other specimens the color is 
deeper, approaching seal-brown, and all 5 exhibit much decortication; 2 have the 
unusual deep purple apex (fig. 5, plate 11). The remaining 6 shells are so decorti- 
cated as to be entirely light or dark purple, although small portions of the cortex 
may still persist in scattered areas (figs. 6 and 7, plate 11); 2 of these also have the 
deep apical pigmentation (fig. 7, plate 11). The various shades of the expanded 
lips are indicated by the illustrations and are systematically recorded in table 5. 
The smooth character of the original cortex is noteworthy. 
TABLE 5.—Partula salifana, Guam. Colors of lip and of embryonic young. 


Color of lip. Embryonic young. 
Adults. No. 
Faint Faint yellow-| More | Faint 
White. | yellow- t hiaatg brown and | or less | light eo Brown. fats 
brown. ‘| faint purple. | purple. | brown. hts sebeleas 
EVES DEOW YM ses «60% ee. sos 1 a0 5 1 
Chestnut brown, little or no 
ECOMTICALION. 50s ence os 7 or 4 Ae: s Ly 2 4 2 
Brown, partly decorticated.. 5 1 1 1 2 Ses ae 3 4 2 
Brown, fully decorticated.. 6 1 ahs 3 2 4 6 1 




The three partly grown individuals are chestnut-brown of a much lighter cast 
on account of the relative thinness of their shells (figs. 8 and 9, plater1). The apex 
is noticeably dark purple in two of these, but there is no indication of that kind of 
lighter color which comes only after maturity is attained and desurfacing ensues. 
Finally, in this connection we may note the colors of the embryonic young, 28 in 
number. Two are whitish with only a slight tinge of brown; 11 are light yellowish- 
brown (fig. 10, plate 11), and 12 are darker yellowish-brown. Three specimens are 
remarkable in their display of a deep-brown color quite as dark as that of the 
adolescents (fig. 11, plate 11). The statistical relations of the various kinds of young 
to their parents of the several color modes are given in table 5. The wall of the egg- 
capsule is transparent, and the albumen within is brown in color. 
In summary, the very young shells gain their fundamental brown color in 
early or late embryonic life, and become darker as they grow older. During adoles- 
cence the full chestnut-brown develops and deepens to seal-brown in some cases. 
Subsequent decortication changes the whole shell to dull purple. 
The statistical description of the perfect adult shells (table 6) precisely defines 
the seven standard characters of the new species in terms of the range, mean value, 
and standard deviation of each character. The data are also given for the classes 
