24 . PROCEEDINGS OF THE ACADEMY OF [1888. 



years in the Sandwich Islands he collected and reared large numbers 

 of the different species and observed the numerous varieties from a 

 common parentage. When in Europe in company with the late 

 Dr. A. A. Gould he examined the types of Dr. L. Pfeiffer and others 

 which enabled him to correct the synonymy of many doubtful spe- 

 cies ; all of which he has embodied in his Synopsis of the Genus, 

 which entitles him to the designation of authority on Achatinella 

 " par excellence." 



For convenience of reference I have arranged the species alpha- 

 betically under the several sections, rather than in a connected series, 

 as was attempted by Mr. Pease. The sections of Achatinell^e being 

 more or less artificial, authors are not always in accord as to which 

 certain species should be assigned. In the majority of instances, I 

 have followed Dr. Pfeiffer or Mr. Pease in the distribution of the 

 species among the sections, being guided in the main by authentic 

 examples, or by figures and descriptions of authors; the sub-section 

 Helicterina adopted by Mr. Pease from Baron Ferussac, has been 

 supplanted by Partulina, the former having been preoccupied. 



In the pi-eparation of this paper I am indebted for aid to several 

 friends. To Prof. A. Agassiz for the loan of the entire Pease collec- 

 tion of Achatinella together with all his duplicates amounting to 

 near two bushels of examples, I have had in my possession several 

 entire suites of Achatinell?e, kindly loaned to me by Prof James Hall, 

 Dr. Lea, Mrs. George Andrews and INIr. P. Ellsworth Call, by which 

 I was enabled to identify types from authors hands. Recently, at 

 the invitation of Dr. Newcomb I spent the greater part of two days 

 in the examination of his collection oi Achatinella made some years 

 ago in the Sandwich Islands. My acknowledgements are also due him 

 for assistance in the determination of many varieties. When in 

 Europe in 1883 I purchased some of the species of Messrs Gulick and 

 Smith from G. B. Sowerby Jr. Recently I have been favored by 

 Mr. D. D. Baldwin of the island of Maui with written catalogues of 

 the localities of the Achatinellse of the Sandwich Islands, together 

 with numerous examples of Achatinella and especially with spec- 

 imens taken from the determined type examples of Mr. Gulick, in 

 the Hawaiau JMuseum. The geographical distribution of the Acha- 

 tinella; in those islands together with their habits, which has been 

 embodied in this paper was expressly prepared by Mr. Baldwin for 

 the Hawaian Almanac and Annual. I am also under obligations 

 to Mr. Geo. W. Tryon Jr., for his uniform courtesy in aiding me in 



