364 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 52 



of shell, 30.0; of last whorl, 16.0; of aperture, 10.5 ; maximum diam- 

 eter of shell, 9.0 ; of aperture, 7.0 mm. 



Two specimens and a fragment were obtained near Rio San Fran- 

 cisco, Serra do Alulato, province of Bahia, Brazil, by Dr. Branner, 

 one of which was donated by him to the National Museum, no. 

 205,956. 



This species differs from the numerous varieties of sectilahris by 

 its more slender and elongated form, the internal callus on the axis, 

 and, in the specimen described, by the duplication of the left-hand 

 basal denticle ; this last character is, however, probably merely indi- 

 vidual. In a large series of 0. sectilahris from various localities 

 none approached the slender form of O. hranneri. On plate xxxvii, 

 figure I, is a figure of O. sectilabris for comparison with 0. hranneri, 

 both being in the same scale. The fragment has been utilized to 

 show the callosity on the axis of O. hranneri, two views being given. 



Plate XXXVII 



Figures all about natural size and on the same scale 



Fig. I. Odontostomus sectilabris Pfeiffer, U. S. Nat. Mus. No. 205957. 



Figs. 2, 3. Views of the axis of Odontostoma branneri Dall, from slightly 



different angles, the last half of the outer wall of the last whorl 



broken away, allowing the callosity to be observed; p. 363. 

 Fig. 4. Odontostomus branneri Dall, n. sp., front view, U. S. Nat. Mus. No. 



205956 ; p. 2>6z. 

 Fig. 5. Pleurodonte (Labyrinthiis) tenaculum Dall, n. sp., oblique view ot 



shell showing the hook in the aperture, U. S. Nat. Mus. No. 



1 1 1073; P- 361. 

 Fig. 6. The same specimen in profile. 

 Figs. 7, 8, 9. Helicina heiglnvayana Dall, n. sp., profile, upper and basal views ; 



U. S. Nat. Mus. No. 11 1074; p. 362. 

 Figs, id, ii. Pleurodonte (Labyrinthiis) tenaculum Dall, views of base and 



upper surface of the specimen represented by figure 5. 



