T1IK NAUTILUS. 



103 



liqua, emarginato-ovalis, extus baud angulata. Perisloma stibin- 

 crassatum. Undique breviter patens, ad basin et colurnellam magis 

 dilatato-expansum, marginibus distantibus, supero strictiusculo, colu- 

 mellari supra perforationem in trianguli forma reflexo. 



Long. 2<H, lat. lH, alt. apert. (oblique) 1(H mill. 



Hab. Espirito Santo, Brazil. 



In texture like B. pileiformis Moric., but in general form more 

 like B. perlucidus Spix. 



Odontostomus squarrosus, n. sp. 



Differt a peratfini 0. exeso, Spix, impressionibns testae magis 

 numerosis, parvulis, minus elongatis, testa subinde minus undata, 

 plica columellari debiliore, dente supero marginis dextri magis ob- 

 lique sito, minore ac minus lato ; cseterum 0. exeso sim ill ima. An 

 ejus varietas? 



Long. 39^, lat. 14^, alt. apert. (perist. incluso), 18^ mill. 



Hab. Brazil. 



Odontostomus ylalratus, n. sp. 



Testa oblongo-fusiformis, perforata, solidula, nitidula, laevigata, 

 obsolete sed in anfractibus prioribus distinctius suboblique striatula, 

 alba, cinereo irregulariter multinotata et strigata. Spira conoideo- 

 attenuata, apice sat minuto, sub lente costulato. Anfractus 9 con- 

 vexiusculi, sutura impressa, simplici discreti, ultimus ovato-oblongua, 

 ampliusculus, latere dextro depressus et late scrobiculatus, basi 

 parum attenuatus. Apertura superne angulata, subovalis, fere recta, 

 ringens, scilicet : dente lamelliformi parum crasso in pariete, plica 

 columellari supera oblique intrante, dente basali uno sulco extero 

 correspondente et dentibus 2 in margine dextro, primo parvulo, 

 secundo majore, in meclio sito. Peristoma expansum, prope insertio- 

 nem strictiusculum, postea leviter angulatum, marginibus remotis, 

 callo incrassato junctis. 



Long. 25, diam. 9, alt. apert. 8| mill. 



Hab. Sierra de Cosquina, Argentina. 



Intermediate, as it were, between 0. Wagneri Pfr., and leptodon 

 Mart. 



Odontostomus Deraini Anc. 



Testa rimato-perforata, fusiformis, subnitida, sordide alba, corneo 

 vel cinereo (statu emortuo) conspersa et irregulariter strigata, con- 



