98 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



with the axial sculpture. The spaces enclosed between the axial ribs and 

 spiral threads are rectangular, having their long axis parallel with the 

 axial sculpture. Suture channeled, rendered wavy by the denticles at 

 the summit of the whorls. Periphery of the last whorl strongly rounded. 

 Base short, narrowly umbilicated, strongly rounded and marked by the 

 continuation of the axial riblets and 8 spiral cords, which are about as 

 strong as those on the spire and bear the same relationship to the axial 

 riblets as those of the spire. The last whorl is slightly solute. Aperture 

 broadly oval ; peristome double, the outer slightly expanded, forming 

 a moderately conspicuous auricle at the posterior angle and a somewhat 

 denticulated, moderately broadly expanded flap, which extends over the 

 umbilicus. On the outer lip it extends but slightly beyond the inner 

 peristome, and on the parietal wall it also is narrow and almost touches 

 the preceding turn ; the inner peristome is slightly expanded and re- 

 flected. Operculum lost in all our specimens. 



The type (U.S.N.M. No. 355327) collected by W. L. Abbott, comes 

 from Tortue Island, north of Haiti. It has a little over 3 whorls and 

 measures: Height, 12.9 mm.; greater diameter, 7.5 mm.; lesser diameter, 

 6.9 mm. 



U.S.N.M. No. 355328 contains 3 topotypes from the same source. 



U.S.N.M. No. 504024 contains 37 specimens collected by Mr. and 

 Mrs. E. C. Leonard in a dry thicket-covered cliff on the west side of La 

 Vallee, Tortue Island. 



U.S.N.M. No. 504025 contains 7 specimens collected by Mr. and Mrs, 

 Leonard at Point Macon, Tortue Island. 



C01,0NIN.\ MANIELENSIS, new species 



Plate 15, Figure 9 



Shell rather large, elongate-ovate, pale brown. Nuclear whorls 2, in- 

 flated, strongly rounded, microscopically granulose. Postnuclear whorls 

 well rounded and marked by slightly retractively curved axial ribs, which 

 on the early whorls are decidedly lamellar, while on the last turn they 

 are not as elevated, but well rounded. Of these axial ribs, 159 are present 

 on the last whorl. The spiral sculpture consists of threads about as strong 

 as the axial ribs. Of these, 16 are present between the summit and the 

 periphery on the last whorl. On the last turn the axial ribs are wider 

 than the spaces that separate them. On the early whorls the reverse is 

 true. The junctions of the axial ribs and spiral threads form weak 

 nodules. Suture narrowly, rather deeply, channeled. Periphery well 

 rounded. Base well rounded, openly umbilicated, and marked by the 

 contuiuation of the axial ribs and seven spiral threads. There are eight 

 additional spiral threads on the umbilical wall. Those of the anterior 

 portion of the base and the outer portion of the umbilical wall are 

 stronger than those on the spire. The last whorl is solute for about one- 



