xxxvn] WILLIAMSONIA 461 



Williamsonia oregonensis Fontaine. 



The type-specimen from Jurassic rocks in Oregon 1 consists 

 of a stout axis bearing several contiguous linear bracts forming 

 a more or less spherical cluster 5 cm. broad. The form suggests 

 a Williamsonia, but the evidence is hardly decisive. 



Williamsonia Forchammeri Nathofst. 



A Bornholm species 2 from Lower Jurassic strata represented 

 by an annular zone surrounding a central area, probably a portion 

 of an ovulate strobilus. 



Williamsonia minima Saporta. 



This Upper Jurassic species from Portugal 3 consists of a number 

 of small bracts or leaves attached to a central axis and is of no 

 value as evidence of the occurrence of Williamsonia. 



Williamsonia problematica (Newberry). 



This species was first described from the Amboy clays as 

 Palaeanthus (Williamsonia) problematica* and compared to a 

 Composite inflorescence with long ray-florets. More recently 

 Hollick 5 has referred to this species specimens from the Cretaceous 

 of Long Island and Martha's Vineyard, but none of them afford 

 conclusive evidence of Williamsonian affinity. Some of the 

 examples, as suggested by Hollick, agree fairly closely with 

 Williamsonia cretacea Heer. 



Williamsonia Smockii Newberry. 



The curious urn-like bodies from the Amboy clays 6 on which 

 this species is based are not unlike the capsules of a Papaver 

 but bear no real resemblance to a Williamsonia. 



Williamsonia Riesii Hollick. 



A species from the Cretaceous rocks of Martha's Vineyard 7 

 referred to Williamsonia on rather slender grounds and represented 

 by imperfect material. 



1 Fontaine in Ward (05) B. p. 118, PL xxix. fig. 6. 



2 Nathorst (80) p. 41, PL vm. fig. 7. 3 Saporta (94) B. p. 105, PL xix. fig. 9. 



4 Newberry and Hollick (95) p. 125, PL xxxv. figs. 19. 



5 Hollick (06) p. 107, PL v. figs. 2732; (12) p. 156, PL CLXIII. fig. 4. 



6 Newberry and Hollick (95) p. 127, PL xxxvi. figs. 18. 



7 Hollick (06) p. 107, PL v. figs. 25, 26. 



