26 PROCEEDINGS OF THE NATION^AIi MUSEUM VOL.72 



recognized. Figure 11 represents a variety in which the alternation 

 of the denticles is not so evident and the denticles are shorter. 



PUsiotypes.—Q2^t. No. 11438, U.S.N.M. 



Genus LONCHODINA Ulrich and Bassler. 1926 



LONCHODINA IRREGULARIS, new Bpecics 



Plate 9, flg. 12 



Bar slightly outwardly bowed, irregularly curved, with the anterior 

 end shorter and bent abruptly downward. Main cusp located at the 

 point of downward bending, followed posteriorly by two equally 

 large denticles separated by a minute one. Rest of bar occupied by 

 narrow, more delicate denticles decreasing in size to the extremities. 

 The irregularity of curvature and the three larger central denticles 

 characterize this species. 



Eolotyj>e.—C2it. No. 11439, U.S.N.M. 



LONCHODINA DISCRETA Ulrich and Bassler 



Plate 9, fig. 13 



1926. LoHchodina disci-eta Uleich and Basslee, Proc. U. S. Nat Mus., vol. 18, 

 p. 36, pi. 10, figs. 1, 2. 



A pointed, short, robust cusp rises from an irregularly curved, 

 narrow bar. The cusp is separated from the denticles on each side 

 by spaces several times its diameter. The two denticles on one side 

 of the bar are short and robust; on the other side there are three 

 which are thin. 



Plesiotype.— Cut No. 11440, U.S.N.M. 



Genus PRIONIODELLA Ulrich and Bassler, 1926 



PRIONIODELLA ARCUATA, new species 

 Plate 9, fig. 14 



Tooth minute, broadly arched, the bar of which is very narrow, 

 but well rounded. Denticles all similar, being delicate and needle- 

 like, but the long ones are grouped on the anterior part of the bar and 

 the short ones on the posterior. The decided curvature of the bar, 

 the absence of a main cusp, and the two sets of delicate denticles 

 characterize this species. 



Holotype.— Cat. No. 11441, U.S.N.M. 



PRIONIODELLA INUTILIS. new species 



Plate 9, fig. 15 



Bar broad, very slightly curved, bearing closely arranged, but 

 distinctly separated denticles rather equal in size. 

 Eolotype.—C&t No. 11442, U.S.N.M. 



