114 CATALOG OF FOSSIL FISHES IN THE MUSEUM 



P. howlandi is at once distinguished from the four or five other 

 known species, by its size and form, its pronounced beak associated 

 with relative shallowness in outer view, and by the remarkable knife- 

 edge formed by the outer margin of the posterior tritor. 



The species is named for Mr. Henry R. Rowland, of the Buffalo 

 Society of Natural Sciences, in appreciation of his interest in the 

 development of the fish collection in the Buffalo Museum, and of the 

 encouragement he has given us in the preparation of this catalog. 



The following specimens are all from the type locality and were 

 collected at various times during the past four years by Mr. Bryant. 



E 1920 Right lower dental plate, perfect as far back as the hinder 

 portion of the tritor. The beak is rather low and worn, 

 and the cutting edge following it is also much worn. 



E 1926 Two fragments of dental plates exhibiting a portion of a 

 narrow tritor joining a sharp edge. The tritor is much 

 worn so that the line joining it with the cutting edge 

 rises almost perpendicularly (PL 40, figs. 2, 3). No com- 

 plete specimens of this type of dental plate have yet 

 been collected, and it is possible that when one is found, 

 it may turn out to be a distinct species. 



E 2412 A number of fragmentary tritors and sectorial margins of 

 dental plates of various sizes. 



E 2413 An imperfect right lower dental plate somewhat larger than 

 the type specimen. It shpws the greater portion of the 

 tritor and about half of the pre-tritoral region. 



E 2414 Anterior half of an upper dental plate. The beak is low and 

 rounded, and the cutting edge behind it very sharp and 

 unworn (perhaps a young specimen). Only the front 

 portion of the tritor is present. Length from anterior 

 margin to' end of cutting edge, :^7, mm. 



E 2415 Two imperfect dental plates of specimens about as large as 

 the type. They show the greater portion of the anterior 

 cutting edge and about half of the tritor behind it. 



E 2416 Tritor of a rather large dental plate, larger than the pre- 

 ceding. It narrows anterior-ward and lacks only about 

 0.5 cm.*of the front end. 



