vi LIST OF ILLUSTRATIONS. 
PrateE 14. All shells natural size: 
Fics. 1 to 57. P. gibba Férussac, from Saipan. 
Fics. 1 to 10. Color-class unicolor, shells from 
Sadog Tase, excepting those of figs. 6 and 
8, from Fanaganam. 
Fics. 11 to 20. Color-class bicolor, shells from 
Fanaganam, excepting those of figs. 12, 
13, and 17, from Garapan. 
Fics. 21 to 30. Color-class mitella, shells from 
Chalankiya. 
Fics. 31, 34, 36, 37. Color-order mitella-rubra, 
Chalankiya. 
Fics. 32, 33. Color-order mitella-rubra, Puntan 
Muchut. 
PLATE 14.—Continued. 
Fic. 35. Color-order mitella-rubra, Astaman. 
Fics. 38 to 40. Color-order castanea-rubescens, 
Puntan Flores. 
Fics. 41, 44, 47, 48. Color-order castanea-rubes- 
cens, Sadog Tase. 
Fics. 42, 43, 45, 46. Color-order castanea-rubes- 
cens, Garapan. 
Fic. 49. Color-order castanea-rubescens, Fanaga- 
nam. 
Fics. 50, 52, 53, 57. Color-order castanea-purpures- 
cens, Fanaganam. 
Fics. 51,54 to 56. Color-order castanea-purpures- 
cens, Garapan. 
