82 MESSRS. GULICK AND SMITH ON [Jan. 7, 



transversisfuscis basim versus cincta ; sutura distincte marginata ; 



spira leviter concava ; anfract. 6, primi 3 convexiusculi, cceteri 



convexi ; apertura alba ; perist. margine tenui, dilute fusco intus 



limbatum ; plica columellaris mediocriter valida. 

 Long. 17 mill., diam. 11. 

 Station. On trees. 



Habitat. Kalaikoa and Lehui, on Oahu. 



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

 narrower spire. 



Remarks. All the specimens found are dextral. The shell figured 

 is from Lehui. 



Apex ttjmefactus, Gk. (Plate IX. fig. 20.) 

 Testa perforata, sinistrorsa, globoso-conica, nitida, incrementi lineis 

 spiralibusque indistinct is striata, alba, zonis paucis olivaceo-fuscis 

 cincta; sutura marginata ; spira vix concava; anfract. 6, primus 

 nigrescens, primi 3-4 convexiusculi, cceteri convexi ; apertura 

 recedens, alba ; perist. dilatatum, intus incrassalum ; plica colu- 

 mellaris valida, alba. 

 Long. 19 mill., diam. 12. 

 Var. n. Testa olivaceo-fusco strigata, zonis 1-3 albis interrupta ; 



sutura albo marginata. 

 Var. ft. Testa cervina vel nigro vel fusco strigata ad peripheriam 



zona lata alba interrupta ; sutura albo marginata. 

 Station. On trees and shrubs. 

 Habitat. Wahiawa ; rarely in Helemano. 



Affinities. It is related to A. decorus, Fen (syn. A.perversus, Swn.), 

 which is found in Helemano and Kawailoa. It is distinguished 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. 



Remarks. This species is never dextral. The shell figured is from 

 Wahiawa. 



Apex LEUCOPHiEus, Gk. (Plate IX. fig. 16.) 



Testa sinistrorsa, subperforata, ovato-conica, parum nitida, incre- 

 menti lineis et transversim indistincte exilissime striata, dilute 

 cervina, dilute fusco strigata et zonula ; sutura distincte albo 

 marginata; anfract. 7, subconvexi ; apertura alba ; perist. paulu- 

 lum dilatatum, intus valide incrassatum, dilute fusco tinctum ; 

 plica columellaris valida, albida, aliquanlo reflexa, rimam parvam 

 fere tegens. 



Long. 22 mill., diam. 12. 



Station. This species is arboreal. 



Habitat. Waialei, island of Oahu. 



Affinities. It is allied to A. perversus, Swn., and A. validus, Pfr. ; 

 but it is of a paler colour and more elongate form. 



Remarks. It is always sinistral. 



