PLATE I. 
PLATE 2A. 
PLATE 2B. 
PLATE 3A. 
PLATE 3B. 
PLATE 3C¢. 
PLATE 4A. 
PLATE 4B. 
PLATE SA. 
PLATE 5B. 
PLATE 6a. 
PLATE 6B. 
UATE. 7. 
PLATE 8a. 
PLATE 8B. 
PLATE 9A. 
PLATE 9B. 
PLATE Io. 
PLATE II. 
LIST OF ILLUSTRATIONS 
Map of Guam. 
Open mid-west coast of Guam, with the northern 
limestone plateau in the distance. 
Western border of the northern plateau of Guam, 
with abrupt cliffs devoid of thick vegetation. 
Southern portion of Guam, western aspect, from 
Apra Harbor. 
View into Umatac Harbor, Guam. Mount 
Bolanos on the left and part of Mount Schroe- 
der on the right. 
Southwestern portion of Guam. Mount Bolanos 
left, Mount Schroeder right center, peak of 
Mount Sasalaguan extreme right. 
Heights of Mount Salifan, Guam. Savanna in 
foreground and bush above. 
Contact of savanna and bush near the summit 
of Mount Salifan, Guam. 
Coast near Asan, Guam. Typical areas of 
bush and open slopes. 
The outer Presidio area of collection, Guam. 
Close vegetation at the strand. 
Characteristic vegetation serving as the most 
suitable habitation for Partula, Guam. 
Border of a thicket in Guam. Partulz are pres- 
ent but not abundant in such situations. 
Areas of collection in Guam. 
General aspect of Saipan from the west. The 
culminating summit is Mount Tapochau. 
Vegetation in Saipan. The bush in the distance 
is the Sadog Tase area of collection. 
Collecting ground at Chalankiya, Saipan, the 
most open situation where Partulz were found. 
Numerous Partule on a single leaf of the cal- 
adium, Chalankiya, Saipan. 
Map of Saipan and the areas of collection in 
that island. 
All shells natural size: 
Fics. 1 to 11. P. salifana new species. 
Fics. 1 to 5. Various color types. 
Fics. 6, 7. Decorticated specimens. 
Fics. 8, 9. Adolescent shells. 
Fics. 10, 11. Embryonic shells. 
Fics. 
12 to 19. P. fragilis Férussac. 
Fics. 12 to 16. Specimens of different colors and 
sizes. 
Fics. 17, 18. Young adolescent shells. 
Fic. 19. Embryonic shell. 
Fics. 20 to 64. P. radiolata Pfeiffer. 
Fics. 20 to 26. Color-class pallida. 
Fics. 27 to 32. Color-class flavea. 
Fics. 33 to 36. Color-class fulva. 
Fics. 37 to 44. Color-class strigata 
Fics. 45 to 48. Color-order strigata-helix. 
Fics. 49 to 56. Color-class bicestata. 
Fic. 57. Embryo pallida from flavea adult. 
Fic. 58. Embryo flavea from pallida adult. 
Fic. 59. Embryo fulva from fulva adult. 

Fics. 60, 61. Embryo strigata from strigata adults. 
Fic. 62. Embryo strigata-helix from strigata-helix 
adult. 
PLATE 11.—Continued. 
Fics. 63, 64. Embryo bicestata from bicestata 
adults, 
PiaTE 12. All shells natural size: 
Fics. 1 to 56. P. gibba Férussac, from Guam. 
Fics. 1 to 8. Color-class unicolor, Tarague. 
Fics. 9 to 14. Color-class unicolor, Lolo. 
Fics. 15 to 20. Color-class bicolor, Tarague. 
Fics. 21 to 23. Color-class bicolor, Aniguac. 
Fic. 24. Color-class bicolor, Merizo. 
Fics. 25 to 35. Color-class mitella, Tarague. 
Fics. 36, 37. Color-class mitella, Lolo. 
Fics. 38, 39. Color-class mitella, Dededo. 
Fics. 40, 41. Color-class mitella, inner Presidio. 
Fics. 42 to 44. Color-class mitella, Salifan. 
Fics. 45 to 48. Color-order mitella-rubra, Macajna 
second. 
Fics. 49, 50. Color-order mitella-rubra, Lonfit. 
Fics. 51, 52. Color-order mitella-rubra, Tarague. 
Fics, 53 to 56. Color-order mitella-rubra, Dededo. 
PLATE 13. All shells natural size: 
Fics. 1 to 59. P. gibba Férussac, from Guam. 
Fics. 1 to 3. Color-order phzea-rubra, Lolo. 
Fic. 4. Color-order phza-rubra, Ukudu. Longest 
shell. 
Fics. 5, 6. Color-order pheea-rubra, Lolo. 
Fic. 7. Color-order phza-rubra, Macajna second. 
Fic. 8. Color-order pheea-rubra, Santa Rosa, de- 
corticated. 
Fic. 9. Color-order phza-rubra, Lolo, adolescent. 
Fics. 10, 11. Color-order pheea-rubra, Santa Rosa, 
adolescents. 
Fics. 12 to 14. Color-order phzea-purpurea, Ma- 
cajna second. 
Fics.15 to 19. Color-order pheea-purpurea, Asados. 
Fics. 20, 21, Color-order pheea-purpurea, Macajna 
second, adolescents. 
Fics. 22, 23. Color-order phza-purpurea, Asados, 
adolescents. 
Fic. 24. Color-order castanea-rubra, Dededo. 
Fics. 25 to 27. Color-order castanea-rubra, Ma- 
cajna second. 
Fics. 28 to 31. Color-order castanea-purpurea, 
Pago north. 
Fic. 32. Color-order castanea-purpurea, Macajna 
second, adolescent. 
Fic. 33. Color-order vespera-rosea, Lolo. Shortest 
and narrowest shell. 
Fics. 34 to 42. Color-order vespera-rosea, various 
localities. 
Fics. 43, 44. Color-order vespera-rosea, adolescents. 
Fics. 45 to 51. Color-order vespera-cyanea, vari- 
ous localities. 
Fics. 52 to 56. Color-class marginata, Dungcas. 
Fic. 57. Embryonic shell, white type, from unicolor 
adult. 
Fic. 58. Embryonic shell, tinged apex, from mitella 
adult. 
Fic. 59. Embryonic shell, brown type, from phea 
adult. 
