354 ACHATINELLA CONCAVOSPIRA. 



suture distinctly margined; spire lightly concave; whorls 6, 

 the first three a little convex, the rest convex. Aperture 

 white; peristome with a thin margin, bordered within with 

 dilute brown ; columellar fold moderately strong. Length 17, 

 diam. 11 mm. ' ' ( Gulick ) . 



Oahu: Kalaikoa and Lehui [Lihue], on trees (Gulick). 



"It is allied to A. tuberans Gk., but has a much narrower 

 spire. All the specimens found are dextral. The shell fig- 

 ured is from Lehui" (Gulick). 



Gulick 's figured type from Lihue is drawn on pi. 62, figs. 

 22, 23, no. 102 Boston Soc. coll. The locality "Kalaikoa" is 

 probably an error. It is possible though not probable that 

 under long past conditions it extended across the central 

 plain, as some Amastras have done. However, turbiniformis 

 has the look of a shell from high on the ridges. It is, in fact, 

 merely a shortened form or local subvariety of concavospira, 

 which is a high altitude shell. 



The apex and embryonic whorls are white in the specimen 

 selected by Gulick as type. It was a dead shell. The last em- 

 bryonic whorl is weakly plicate axially, as in some typical 

 concavospira. The sutural margination of the post-embryonic 

 whorls is strong, and faintly touched with brown along the 

 sutural edge on the last two whorls, perhaps further up, in 

 life, the spire of the type appearing somewhat faded. The 

 penultimate and last whorls are particularly convex, last 

 whorl short, swollen, with a pattern of interrupted oblique 

 streaks and narrow spiral lines of brown, chiefly on the base, 

 but near the lip the pattern extends upward nearly to the 

 suture. The narrow lip-callus stops a few millimeters short 

 of the suture, as in typical concavospira. Length 16, diam. 

 11, length of aperture 8 mm. ; 6% whorls. 



Mr. Spalding collected turbiniformis on the Lihue-Popou- 

 wela division ridge, in a prolific colony of bicolor, both pre- 

 serving their individuality. It occurs for some distance up 

 the ridge. One of this lot is figured, pi. 62, fig. 21. 



