2 PROCEEDINGS OF THE NATIONAL MUSEUM vol.69 



blackish, narrow, the base of the shell below it spirally angulated. 

 Behind the aperture are two short constrictions. The upper one at 

 the end of the faint white peripheral spiral line, and giving rise to 

 the small tooth or swelling just within the outer lip at its middle 

 point; the lower one giving rise to the small tooth just within the 

 basal portion of the lip. 



The type (Cat. No. 362151, U.S.N.M.) measures: Length, 25 mm.; 

 diameter, 9.5 mm.; length of aperture 9 mm. It and six paratypes 

 (Cat. No. 362152, U.S.N.M.) were presented by Mrs. Agnes Chase, 

 who collected them " on bare cliffs of rock, north face of Paulo 

 Affonso Falls in Rio Sao Francisco, State of Alagoas, Brazil, De- 

 cember 1, 1924." 



The State of Alagoas lies between the States of Pernambuco on the 

 north and Sergipe on the south; and Paulo Affonso Falls are about 

 140 miles above the mouth of the Sao Francisco. 



The species is most nearly related to Odoivtostomus {Gyclodontina) 

 inflatus Wagner, but is much more slender, has much stronger growth 

 riblets, and has the teeth, especially those on the outer lip, much 

 smaller. 



ODONTOSTOMUS (GYCLODONTINA) IHERINGI, new species 



Plate 1, fig. 10 



Shell rather strong, f usif orm-turrited ; whorls seven and one-half, 

 somewhat rounded; sculpture of man}^ strong, flexuous retractive 

 growth riblets, the upper ends of which subcrenulate the sutures; 

 apical whorls linely grated. Color faded, but on the back of the body 

 whorl enough color remains to show that there was a chestnut 

 strigation at that point, and that the whorl just back of the lip was 

 chestnut. Aperture about two-fifths the length of the shell, is sides 

 parallel to the axis, lip white, expanded all round, a moderately thick 

 callus across the parietal wall. Channel at upper end of outer lip 

 and that at upper end of columellar lip obsolete. Aperture nearly 

 filled with teeth of which there are eight as follows : A minute tooth 

 at the left end of the parietal wall, a large heavy tooth to the right 

 of the middle of the wall, two small fairly acute teeth in the upper 

 portion of the outer lip, followed by a very heavy drooping tooth 

 reaching more than halfway across the aperture at the middle of the 

 outer lip, base of lip with two platelike teeth, the one to the right 

 being the larger and a heavy drooping triangular tooth on the 

 columella. Edges of all the teeth white, the sides of the heavy tooth 

 on the outer lip, the sides of the two basal teeth and the lower side 

 of the columellar tooth brown; umbilicus narrow, the base of the 

 shell below it spirally angulated. Behind the aperture are two 

 short, deep constrictions, the upper one giving rise to the large tooth 



