62 STUDIES IN GEOLOGY, No. 4 



ton) and Otoz&mites molianus Zigno, 20 as well as other wide- 

 spread and abundant Jurassic types, all of which serve to 

 strengthen the impression that this South American occurr- 

 ence is Jurassic rather than Lower Cretaceous. 



Zamiostrobus crassus (L & H) Gceppert? 



Zamiostrobus crassus Neumann, Neues Jahrb. Beil. Bd. 24, p. 83, 

 pi. 2, fig. 5, 1907. 



This object may represent a part of a cycadophyte cone 

 but it does not appear to me to be identical with the European 

 Wealden form with which Neumann identified it and prob- 

 ably represents a fragment of a large branch of a Brachy- 

 phyllum. The material came from San Lorenzo Island. 



Genus CYCADOLEPIS Saporta 

 Cycadolepis sp. 



Rhynchogoniopsis neocomiensis Neumann, Neues Jahrb. Beil. Bd. 

 24, p. 86, pi. i, fig. 3, 1907. 



This supposed fruit from San Lorenzo Island which Neu- 

 mann made the basis of a new carpological genus is con- 

 tained in my collections and is nothing other than a cyca- 

 dophyte conescale. 



Cycadolepis Bonnieri Zeiller 



Zamiostrobus aff index Saporta, Neumann, Neues Jahrb. Beil. Bd. 

 24, p. 84, pi. 2, fig. 4, I907- 



Cycadolepis (?) Bonnieri Zeiller Revue Gen. Bot. tome 25 bis, p. 

 22, fig. G, pi. 20, fig. 5, 1914. 



This form from San Lorenzo Island is fully discussed by 

 Zeiller and undoubtedly represents, as my own material 

 shows, cone scales of some cycadophyte, the markings on the 

 scales corresponding in my material to what appears to be 

 the areas of attachment of pollen sacs. 



20 Zigno, A., Fl. foss. form. Oolith., vol. 2, p. 92, pi. 35, figs. 1-3; 

 pi. 36, figs. 1-5, 1885. 



