66 THE NAUTILUS. 



conoidea, obtusa. Anfractus 4^ convexiusculi, regulariter crescen- 

 tes, sutura appressa, superficiali ; ultimus supra convexiusculus, infra 

 convexior. Apertura subobliqua, lunata, sat ampla, transverse 

 oblonga. Peristoma acutum, marginibus distantibus, columellari in 

 trianguli forma everso. 



Diam. maj. 15, min. 13, alt. 8;^, alt. apert. oblique 7^ mill. 



Hab.: Antankaratra Country, N. E. Madagascar (Humblot). 



The two specimens I have seen of this species probably are young 

 ones, altogether the species is quite distinct from any other from 

 Madagascar on account of its peculiar sculpture. 



Macrochlamys Humbloti Anc. 



Testa anguste perforata, conoideo subdepressa, tenuis, nitidissima, 

 fusco vel purpureo-cornea, zona pallida, albescente, dilutaque infra 

 suturam ornata, subloevigata, infra lineis increment! radiantibus 

 obsolete notata et sub valida lente exiliter striis spiralibus incisula. 

 Spira conoidea, subobtusa. Anfractus 5^ regulariter et sat lente 

 accrescentes, convexiusculi, sutura levi, appressa; ultimus supra- 

 convexo-declivis, infra convexus, subdepressus. Apertura parum 

 obliqua, lunata, truncato-oblonga. Peristoma simplex, marginibus 

 distantibus, columellari minute in trianguli forma expanso. 



Diam. maj. 12^, min. 12, alt. 8, alt. apert. oblique 6 mill. 



Hab.: Aniankaratra Country (Humblot). 



Quite unlike the other species hitherto recorded from the island, 

 the sulural white band being an unusual feature in the genus. 



Helicophanta Alayeriana Anc. 



Testa imperforata aut vix subrimata, depressa ovato-globosa, soli- 

 dula, primum lojte fulva et inconopicue griseo multifasciata, deinde 

 in ultimo intense brunnea et paulatim nigricans, ac proeter zonam 

 pallideorem initio ultimi anfractus supra j)eripheriam concolor, 

 epidermide nigra glutinosa decidua induta. Spira brevissima, con- 

 vexa, obtusa, apice subplanata. Anfractus 4, celerrime accrescentes, 

 convexiusculi, sutura impressa in ultimo sublacerata divisi ; embryo- 

 nales tenuiter oblique striati, penultimus granulis parvis et elongatis 

 irregulariter asperatus, ultimus ab initio granulis destitutus, irregu- 

 lariter plicatulus, maximus, inflato-depressus, ad aperturam super- 

 ficialiter atque spiraliter submalleatus, basi convexus. Apertura 

 perobliqua, diagonalis, late ovalis, sublunata, intus atro-cyanea, mar- 

 garitacea, nitida. Peristoma incrassatum, expansum, basi breviter 



