ART, 5 BIBLIOGRAPHY OF THE CONODONTS— HOLMES 33 



numerous tubercules. It extends the whole length of the plate, 

 beyond which it is produced by means of a long, robust carina, bear- 

 ing several large denticles. The tubercules on the plate are arranged 

 in less definite order than in P. fennatulus. 

 H olotype. —Cdit. No. 11, 461, U.S.N.M. 



POLYGNATHUS PENNATULUS Ulrich and BassJcr 



Plate 11, fig. 15 



1926. Polygnathus pemiatulus Uoiich and Bassijer, Proc. U. S. Nat. Mus., vol. 

 68, p. 45, pi. 7, fig. 8 ; pi. 9, figs. 24, 25. 



The narrow median ridge which bears denticles throughout its 

 length extends from the anterior end of the plate to the carina, which 

 is slightij^ deflected. Several stout denticles are borne on the carina. 

 The tubercules on both sides of the plate occur in short parallel lines 

 extending from the margin to a depression at the base of the ridge. 



Plesiotype.—^o. 11, 462, U.S.N.M. 



Genus PALMATOLEPIS Ulrich and Bassler, 1926 



PALMATOLEPIS INEQUALIS. new species 



Plate 11, figs. 8-10 



This plate is divided into three parts by the unequal bifurcations 

 of the median ridge. The main part of the ridge which is produced 

 beyond the plate by a short, blunt carina, is broad and stout. The 

 branches which are thin and high bear six or seven denticles. The 

 short, blunt tuberc'ules on each section of the plate are generally 

 arranged at right angles to the main ridge or its branches. Figure 

 10 is the under surface of plate with the same bifurcated ridges but 

 without ornament. 



Gotypes.—Q^i. No. 11, 458, U.S.N.M. 



PALMATOLEPIS ELONGATA, new species 



Plate 11, fig. 13 



This is a long, narrow, minute plate with the finely denticulated 

 median ridge extending its whole length. The ridge is very low 

 at the anterior end but rises toward the posterior end where it be- 

 comes high and broad. On one side of the plate there is a short, 

 pointed lobe. The relative smoothness of the surface serves to dis- 

 tinguish this species from Palmatolefis verlohata Ulrich and Bassler 

 to which it is related. 



Eolotyfe.—Q^i. No. 11, 460, U.S.N.M. 



