136 Proceedings of the Biological Society of Washington. 



basal fasciole midway between which and the peripheral cord a third 

 strong spiral cord is present. The peripheral cord and the median 

 cord are of equal width and are separated by a deep incised channel 

 which equals that separating the basal fasciole from the median cord. 

 Aperture irregular, strongly channeled anteriorly; posterior angle 

 obtuse ; outer lip thin at the edge, decidedly sinuous ; inner lip reflected 

 and appressed at the base. 



The type and three specicimens of this species, Cat. No. 21907, U. S. N. 

 M., were collected by Mr. D. W. Wright, in old Tampa Bay, Fla. The 

 type has lost the nuclear whorls. The eight postnuclear whorls remaining 

 measure: length, 3 mm. ; diameter, 1.1 mm. Seven paratypes from the 

 same station are in the Florida State Museum, 



