26 



BULLETIN m, UNITED STATES NATIONAL MUSEUM. 



DENTALIUM (DENTALIUM) LAQUEATUM REGULARE, new subspecies. 



Plate 1, fig. 8. 



Four lots in the National Museum collection from Jamaica and 

 Barbados carry the ribs without change, even in fully adult speci- 

 mens, to the oral end of the shell. The 12 ribs in the specimen se- 

 lected as a type are prominent and are neither modified nor flattened 

 at their termination in the aperture rim of the shell. The line reticu- 

 Jation and all other features remain as in typical forms (DentaJium 

 laqueatum. laqueafum) . 



The type, Cat. No. 107887, U.S.N.M., measuring 40.5 mm. in 

 length and 5.5 mm. in diameter, was collected by C. B. Adams in 

 Jamaica, without depth record. 



iTypg. 



