128 



varieties from .76 inch : .35 inch to .64 inch : .4 inch. The 

 dimensions of Dr. Gould's type, .75 inch : .4 inch, are most 

 common. 



AcHATiNELLA MODESTA. Shell rather thick and short, ovate- 

 conic : dingy reddish or ash brown ; more or less covered with 

 a dingy dark brown epidermis : with fine irregular transverse 

 striae, which are coarser on the upper whorls ; without spiral 

 striae : apex subacute : spire short, with the outlines quite 

 curvilinear : whorls six, moderately convex, with a well im- 

 pressed suture ; last whorl rather ventricose : aperture ovate, 

 somewhat acute above ; lip sharp, not expanded, moderately 

 thickened within ; columellar fold well developed, quite 

 oblique. 



Mean divergence 50° ; length .54 inch ; breadth .3 inch ; 

 length of aperture .26 inch. 



The corresponding dimensions of another specimen are — 

 47° ; .55 inch ; .29 inch ; .24 inch. 



Habitat, Sandwich Islands. 



AcHATiNELLA Reevei. Although the name Achatinella 

 radiata Pfr. appears in Dr. Pfeiffer's Hel. Monog. as a syn- 

 onyme of A. viridans Migh., yet Mr. Reeve, in his beautiful 

 monograph of this genus, has represented this species under 

 the name of A. radiata, and has given another species with Dr 

 Mighels' name. Dr. M. and myself about the same time re- 

 ceived this very distinct species, and having seen it in his col- 

 lection, I cannot doubt the correctness of Dr. Pfeiffer's synony- 

 my. Some other specimens before me appear to be very 

 exactly represented by Mr. Reeve's figure of A. viridans, and 

 are most nearly allied to a group consisting of A. pulcherrima 

 Swains., A. castanea Rv., A. abbreviata Rv., &c. I propose 

 for Mr. R.'s A. viridans the name which stands at the head 

 of this paragraph. 



