1921] NATURAL SCIENCES OF PHILADELPHIA. 1351 



eral small teeth within, below the middle. There is a very heavy 

 callus on the parietal wall, and about 6 teeth on the columella. 



Length 10.2, diam. 5.2 mm.; length of aperture 5.8 mm. 8^ 

 whorls. 



Type and two other adult and three young specimens are no. 3996 

 A. N. S. P. 



It is well distinguished from S. haitensis by the slender, smooth 

 spire. 



S. caribaea micra n. var. Plate XVIII, flgs. 10, 11. 



Smaller and narrower than the preceding, with 8 basal cords, 

 three teeth within the outer lip and none on the columella. 



Length 5.8, diam. 2.7 mm.; 7| whorls. 



The two figures represent the same specimen, fig. 11 being the 

 same scale as fig. 9. 



Type no. 2800 A. N. S. P. 



Strombina haitensis (Sowerby) 



Columbella haitensis Sowerby, Q. J. Geol. Soc. vi, 1849, p. 46. 

 Stro'mbina haitensis Sby., Gabb, Tr. Am. Philos. Soc. xv, 1873, p. 221. 



Distinguished by the straight axial ribs of the spire, and small 



ridge revolving immediately below- the suture. Length 8.5 mm. 



strombina politissima Pils. and Johns. Plate XVIII, flg, 15. 



Proc. A. N. S. Phila., 1917,p. 168. 



S. mira Dall, from Gatun, has a small prominence below the su- 

 ture, wanting in politissima, and the last whorl is striate from the 

 periphery down. Otherwise our species appears very close to it. 



strombina prisma Pilsbry and Johnson. 



Stroinbitia prisma P. and J., Proc. A. N. S. Phila. 1911, p. 352, footnote, pi. 



25, figs. 9, 10. 

 Strombina gradata Guppy, in part, Gabb, Tr. Am. Piiilos. Soc. xv, 1873, p. 



221. Not of Guppy. 



The type and six other specimens are no. 3292 A. N. S. P. 



Strombina cyphonotus Pilsbry and Johnson. 



Strombina cyphonotus P. and J., Proc. A. N. S. Pliila. 1911, p. 353, footnote. 



pi. 25, figs. 6, 7. 

 Strombina gradata Guppy, in part, Gabb, Tr. Am. Philos. Soc. xv, 1873, 



p. 221. Not of Guppy. 



The type and eight other specimens are no. 3893 A. N. S. P. 



StrombineUa acuformis Dali. 



Strombinella acuformis Dall, Proc. U. S. Nat. Mus. xix, p. 312, pi. 29, fig. 6. 



Potrero, Rio Amina, Dall; Santo Domingo, Gabb, no. 2960, four 

 specimens. 



