DISTRIBUTION, COLOR PATTERNS. 



XIX 



(Waianae range) 



A. mustelina Migh. 342. A. concavospira Pfr. 351. 



A. m. sordida Newc. 349. A. c. turbiniformis Gul. 353. 



A. m. lymaniana Bald. 350. 



Incertce sedis. 

 A. aptycha Pfr. 54, 145, 363. 



DISTRIBUTION OF GENERA, SUBGENERA AND SPECIES. 



N. B. No species is common to two islands. 



COLOR PATTERNS OF ACHATINELLID^:. 



The primitive color pattern of arboreal Achatinellidtz may 

 have consisted of dark streaks in the direction of growth- 

 lines, on a light ground. This pattern is common to many 

 species of various genera of the family, and to some species 

 in practically all the minor groups. It is one of the common 

 patterns of coloration of snails in many families to have the 

 pigment thus deposited periodically instead of continuously. 

 In many Partulinas the streaks have become distinctly denned, 

 and lose their primitive relation to the growth-lines, becoming 

 zigzag or oblique, or they may be interrupted to form a tessel- 



