Synopsis of the Genus Achatinella. 305 



what from, the typical forms, which has led to the multiplica- 

 tion of species by this exhibition of their artistic skill. 



The variation in the different stages of growth of the same 

 species has been a fruitful source of error, and encumbered our 

 table of synonyms with a large list of names. 



On the other hand, our best conchologists have been led into 

 error by a simple examination of the shell alone, and grouped 

 as varieties, species, of which the animals, in their appearance, 

 form, and habits, are widely separated. As far as practicable, 

 I have endeavored to make suitable corrections. 



To the various collectors, scientific and amateur, I am under 

 many obligations, and take this opportunity of acknowledging 

 favors received from Rev. Mr. Johnson, Rev. Mr. Dwight, 

 Messrs. Pease, Gulick, Remy, Garratt, Frick, and many others. 



Note. — My descriptions of Achatinellce are in the Annals of the 

 Lyceum of Nat. Hist. N. Y., vol. vi., Proc. Zool. Soc. Lond. 1853, and 

 Proc. Boston Soc. Nat. Hist. 1855. 



1. A. textilis Fer. Voy. de Freyc. p. 482. 

 " ventulus Reeve, non Fer. Monograph, No. 31. 

 " microstoma Gould. Proc. N. H. Soc, Post. 1845, p. 28. 

 " ventulus Pfr. Mon. Hel. Viv. ii. p. 241. 



Hob. Oahu. 



Ferussac's types of this genus, so far as preserved, are in the 

 collection of the " Jardin des Plantes," at Paris. My thanks 

 are due to the gentlemanly Savans who have the Conchological 

 department in their charge, for extending to me every facility 

 in searching for, and examining critically the desired species. 

 But for an absolute certainty, I would not venture to change 

 the well established position in nearly all European and Ame- 

 rican collections of this, and the following species. I am 

 happy to have the testimony of Dr. Gould of Boston, of 

 M. Kiener, and others, to vouch for the correctness of my 

 opinion. 



