352 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



comparing a large series of these shells, it is to be observed that 

 the great differences in form and aspect produced by the elation or 

 depression of the spire, the expansion of the outer lip, as well as 

 the smoothness or malleation of the surface, etc., are characters 

 subject to such variation in degree that I find it impossible to define 

 the limits of each form. 



Yar. AUSTKALis, D'Orbigny. 

 A. amtralis, D'Orb. : Voy. Amer. Merid., p. 375, pi. li, figs. 3, 4. 

 Hah. — Buenos Ayres. 



Yar. Belizensis, Crosse & Fischer. 

 A. Belizensis, C. & F. : Journ. de Conch., 1890, p. 110. 

 Hal. — Belize, Mexico. 



Yar. Dysoni, Hanley. 

 A. Dysoni, Hanley: Conch. Misc., No. i, pi. ii, fig. 1. 

 A.paludosa, Say: JST. H. Diss., 1840, p. 260. 

 A. venetus, Eeeve : Conch. Icon., sp. 17. 

 A. Hondurasensis, Beeve: Conch. Icon., sp. 15. 

 Hah. — Honduras. 



Yar. FLAGEiLATA, Say. 

 A.flagellata, Say: Conch. U.S., 1856, p. 147. 

 A. Lamarchi, Phil. : Conch. Cab., p. 67, pi. xxi, fig. 5. 

 A.Jlatilis, Beeve : Conch, icon., sp. 31. 

 A. G uate malensis, M-ovelet? 

 Hal. — Mexico, etc. 



Yar. FUMATA, Eeeve. 

 A. famata, Beeve: Conch. Icon., sp. 124. 

 Hah. — Prov. of Chiapes, Mexico. 



Yar. lEMNiscATA, Crosse & Fischer. 

 A. lemniscata, C. & F. : Journ. de Conch., 1890, p. 112. 

 Hah. — Belize, Mexico. 



Yar. LivESCENs, lleeve. 

 A. livescens, Beeve: Conch. Icon., sp. 21. 

 Hah.—? 



Yar. MALLEATA, Jonas. 

 A. malleata, Jonas: Beitr., p. 22, pi. x, fig. 11. 

 Hah. — Mexico. 



Yar. Maetensiana, Nevill. 

 A. Martensiana, Nevill: Hand-list Moll. Ind. Mus. Calcutta, 1884, 

 p. 10. 

 Hah. — South America (Nevill). 



Yar. occLtrsA, Crosse & Fischer. 

 A. occhisa, C. & F. : Journ. de Conch., 1890, p. 111. 

 Hah. — Tanesco, Guatemala. 



