22 NEW TOEK STATE MUSEUM 



projacent at the front; its surface shows without compression both the 

 oblique and transverse moieties of the first glabellar furrows and also 

 the second furrows; the occipital ring is strongly arched and bears a 

 conspicuous tubercle. On the axis of the thorax just within the* dor- 

 sal furrows is a row of large tubercles, one at each end of every 

 axial segment. These are not ornamental, but are more strongly marked 

 on the internal cast than on the external surface; they become smaller 

 posteriorly but on the cast show themselves even on the first segment 

 of the pygidium. The pygidium bears five or six lateral segments, flat 

 and divided by linear furrows which are generally obscure on the cast. 



While these are the diagnostic characters, the species has some 

 other traits which it shares with but few allies. There is a small 

 spinule at the extremity of the cheeks, such as occurs in Ph. cris- 

 ta t a and Ph. p i p a of the Schoharie grit and Onondaga limestone ; 

 no spinules or conspicuous tubercles occur on the axis, such as are 

 found in Ph. cristata but are absent in Ph. pi pa. The divis- 

 ion of the pleural ribs on the pygidium is a feature not displayed in 

 the later Devonic species of the genus (e. g., P h. r a n a). 



The specimens from Becraft mountain have for the most part these 

 characters of Ph. 1 o g a n i. Examples of the thoracic segments of 

 adult forms have proved rather uncommon, but those seen have the rows 

 of tubercles along the dorsal furrows well developed, while in smaller 

 forms these are less conspicuous and may be so far absent as to sug- 

 gest the possibility of there being a second species; and yet it is to 

 be noted that these tubercles are less clearly developed in the later seg- 

 ments of Ph. logani and it may be are obscure in young examples 

 of the species. 



Cordania becraftensis sp. nov. 



Plate 2, fig. 19-23 



1892. Cordania, sp. nov., Clarke, op. cit. p. 412 



Of this species only the cranidia and pygidia are known. The 

 former have a subcircular, marginal curve, with a round, thickened and 

 much elevated border which is clearly delimited within and is followed 

 by a relatively narrow and shallow depressed area passing into the con- 



