Amastra (Laminella) kuhnsi. 



By C. Montague Cooke Jr. 



Specimens of a Laminella from West Maui under the name 

 of Laminella erecta Pease were kindly sent the Bishop Museum 

 by Mr. D. Thaanum. The shells were, I think, identified by Mr. 

 D. D. Baldwin. Lately the specimens were compared with Pease's 

 description and were found to differ considerably from the descrip- 

 tion. As there is no description with which it agrees I venture to 

 describe it as a new species. I have followed Mr. Sykes in plac- 

 ing Laminella as a subgenus of Amastra. 



Amastra (I,aminella) kuhnsi, n. sp. 



The shell is minutely perforate, sinistral, elongately conical, 

 nearly solid, minutely and irregularly striate with lines of growth 

 (the striae slightly stronger just below the 

 sutures), the first four whorls glossy, the rest 

 somewhat glossy, cinnamon brown (apex 

 darker), with a few indistinct irregular zig- 

 zag transverse brown lines on the penulti- 

 mate and last whorls. Spire elongately conic, 

 apex obtuse. Suture minutely crenulate, 

 slightly oblique, well impressed. Whorls 6, 

 the embryonic smooth, convex, the rest in- 

 creasing slowly and regularly, convex, the 

 last somewhat rotundate, tapering towards 

 the base. Aperture rather large, broadly 

 subovate, oblique, whitish within. Columella 

 nearly straight ; columellar fold median, oblique, not strongly de- 

 veloped, thick, blunt. Outer magin of lip convex, erect, thin; 

 columellar margin thin, adnate above, below free, reflexed over 

 the umbilicus. Umbilicus minute, circular. Length 13.4, diam. 

 6.5, length of ap. (diagonal) 5.5 mm. 



West Maui: Kahakuloa (Kuhns, Baldwin). 



Type No. 15,142, cotypes 16,662, Bishop Museum Coll. 



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