34 PROCEEDINGS OF THE NATIONAL MUSEUM vol. (is 



and /.. rectidcns, but not sufficiently to render confusion with tlu'ui 

 al all likely. 



Occurrence. — Devonian (lihinestreet) : Shalcton, N. Y, 



IIolotype.—CM. No. 11285, U.S.N.M. 



LONCHODINA PAUCIDENS, new species 



Plate r,, fig. l 



This species is founded on an exceedingly delicate tooth, distin- 

 guished from all others by its curved bar and very few subequal 

 slender, straggly denticles. Its nearest relatives probably are 

 L. suhanguJata^ L. separata., and L. pro'jecta., but in each case the 

 differences are such that detailed comparisons seem unnecessary. 



Occurrence. — Devonian (Khinestreet) : Shaleton, N. Y. 



II oJotype.— C'At. No. 1128G, U.S.N.M. 



LONCHODINA SUBSYMMETRICA, new species 



Plate 6, figs. 5, 6, 7 ; plate 5, fig. 8 ; and plate 1, fig. 24 



Like L. perlonga., but all the denticles are shorter, and the main 

 cusp is not only shorter but much stronger in its lower half and is 

 situated on the posterior side instead of the anterior. There ai"o 

 thus only five denticles behind the main cusp and usually seven in 

 front of it, instead of nine behind and five in front, as in L. perlonga. 



Occurrence. — Devonian (Rhinestreet) : Shaleton, N. Y. 



Cotypes.—Q^t. No. 11287, U.S.N.M. 



LONCHODINA ABNORMIS. new species 



Plate 6, figs. 8-10 



Readily distinguished from all the associated forms by its rela- 

 tively short, basally nearly straight, and medially thick bar, with 

 few denticles on each side of a large, moderately recurved cusp. 

 Usually three denticles in front of the main cusp and one at its 

 base, which shows only on the inner side, and two behind the main 

 cusp. 



Occurrence. — Devonian (Rhinestreet) : Shaleton, N. Y. 



Cotypes.—Q^i. No. 11288, U.S.N.M. 



LONCHODINA TRANSVERSA, new species 



Plate 6, figs. 2, 3 



In this species the bar is uncommonly long and straight and the 

 denticles show practically no curvature. The species reminds of 

 Hibhardena but the main cusp is not in the middle nor directly 

 over the swelling in the bar as in that genus. The main cusp is 



