462 BENNETTITALES [CH. 



Williamsonia ( ? ) phoenicopsoides Ward. 



This fossil from the Cretaceous of the Black Hills, Dakota 1 , 

 is much too imperfect to be accepted as a record of Williamsonia. 



Williamsonia elongata Lesquereux. 



This species, founded on part of a conical receptacle with some 

 appendages superficially resembling those of Williamsonia 2 , is 

 too incomplete to be determined with any confidence. The 

 type-specimen is from Cenomanian beds in Kansas. 



Williamsonia virginiensis Fontaine. 



This is undoubtedly a true member of the genus; it is 

 characterised by narrow ovate bracts bearing conspicuous hairs 

 surrounding the base of a receptacle which shows a portion of an 

 annular zone of interseminal scales 3 . 



Williamsonia (?) gallinacea Ward. 



This species from the Potomac beds 4 is of no value as a record 

 of Williamsonia. 



Williamsonia (?) Bibbinsi Ward. 



The imperfectly preserved specimen from the Potomac series 

 so named by Ward 5 is probably part of an Abietineous cone as 

 stated by Berry 6 who includes Ward's type with other specimens 

 referred to Abietites macrocarpus Font. 



Williamsonia cretacea Heer. 



Two specimens, figured by Heer 7 from the Lower Cretaceous 

 of Greenland, on which this species is founded, consist of an axis 

 covered with small scale-leaves and at the broad apex bearing 

 numerous narrow linear bracts forming a more or less spherical 

 cluster 3-8 cm. in breadth. The species resembles W. problematica 

 (Newb.). 



1 Ward (99) B. p. 668, PI. CLXII. fig. 20. 



2 Lesquereux (91) p. 87, PI. n. fig. 9. 



3 Fontaine (89) B. p. 273, Pis. 133, 165. 



4 Fontaine in Ward (05) B. p. 485, PI. cvn. fig. 4. 



5 Ward (05) B. p. 554, PI. cxv. fig. 11. 



Berry (11) p. 405, PI. LXVH. figs. 14. 

 7 Heer (82) B, p. 59, Pis. xn., xm. 



