Orij^inal Descriptions of Achatinella. 25 



3-4 convexiusculi, caeteri convexi ; apertura recedens, alba ; perist. dilatatuni, 

 intus incrassatum ; plica columellaris valida, alba. Long. 19. diam. 12 mill. 



Var. A. Testa olivaceo-fusco strigata, zonis 1-3 albis intemipta ; sutura 

 albo marginata. 



Var. B. Testa cervina vel nigro vel fusco strigata ad peripheriam zona 

 lata alba interrupta ; sutura albo marginata. 



Shell sinistral, perforated, globosely conical, shining, striated 

 with lines of growth and indistinct spiral lines, white, encircled 

 with a few olive-brown bands ; suture margined ; spire hardly con- 

 cave ; whorls 6, the first blackish, first 3-4 slightly convex, the 

 others convex, aperture receding, white; lip expanded, thickened 

 within ; columellar fold strong, white. 



Affinities. It is related to A. decorus Fer. (syn. .1. pcyvcrsus 

 Swain.), which is found in Helemano and Kawailoa. It is distin- 

 guished by its smaller size, its concavely conical spire and its paler 

 colour, which is differently distributed. The three upper whorls of 

 A. decorus are of a yellowish tinge ; in this species they are white, 

 terminated with a black dot, which is not found in the typical 

 forms of the other species. — Gk. 



Hab. Wahiawa ; rarely in Helemano. — Gk. 



This species is never dextral. 



LUGUBRIS GROUP. 

 a6. Achatinella lugubris Chemnitz. 



Turbo lugubris Chem. Conch. Cab., xi, 1795, p. 278; pi. ccix, figs. 2059, 2060. 



Testa dextrorsa, trochiformis, polita, nitida, argxite striata ; anfractibus 

 5, primoribus conicis, attenuatis, ultimo gibbo, ventricoso: suturis apice non 

 duplicatis, rcliquis marginatis, linea distinctis adnata ; colore nigro apice 

 albido luteo ; apertura intus alba, semilunata ; peristomate intus incrassato ; 



columella clausa. ( Quoy et Gaimard, Voyage Uranie et Physicienne. 



P- 479- ) 



Shell dextral, trochiform, polished, shining, distinctly .striated: 

 whorls 5, the upper conical, attenuated, the last gibbous, ventri- 

 cose ; suture not duplicate on the apex, the rest margined ; color 

 black, yellowish white at the apex; aperture white within, .semi- 

 lunate ; peristome thickened within ; imperforate. 



A. lugubris was first described as Turbo apex fulva b> Captain 

 George Dixon in the narrative of his Voyage Round the World 

 (London, 1789), p. 354, in which he .says : "At the .same islands 

 (Hawaiian) are great plenty of beautiful shells, such as Cyprcea 

 Tigrina, Mauritiana, Talpa, and others of that genus; and num- 

 berless species of the smaller kinds, of which last the natives form 



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