CORRELATION OF THE JURASSIC 661 



(Oppel), and new species of Ataxioceras and Perisphinctes and Haplo- 

 ceras species. 



The most complete faunal representation is that for the zone of 

 Streblites tenuilobatus, which occurs at Constancia, San Vicente, La 

 Giiira, and Finca Eosario. It contains new species of Perisphinctes, 

 Oppelia, Ataxioceras, Cerithium and the following European representa- 

 tives : 



Ataxioceras lothari (Oppel). 



Perisphinctes ribeiroi Choffat. 



P. cf. plebejus Neumayr. 



Haploceras aff. fialar (Oppel). 



There is no indication, so far, of the existence of the lower Portlandian 

 (sensu lato) in Cuba, but three upper Portlandian species have been 

 identified, namely : 



Simbirskites mexicanus Burckhardt. 

 Kossmatia zacatecana Burckhardt. 

 Kossmatia victoris Burckhardt. 



The first two were found near Yiiiales, according to Roig, while the 

 third was found north of Candelaria, indicating that the Portlandian 

 occurs in the eastern and western parts of the section. 



The exact stratigraphic position of the Aptychus shales has not yet 

 been determined, but the fossils themselves seem to indicate a late 

 Tithonian or early Cretaceous age. The following species have been 

 described from the region north of San Cristobal : 29 



Aptychus cristobalensis O'Connell. 

 Aptychus cubanensis O'Connell. 

 Aptychus pimientensis O'Connell. 



The majority of the new species which have been described 30 belong 

 to the Lusitanian and lower Kimmeridgian. The Lusitanian species 

 show affinities with species found in the zones of Peltoceras transvers- 

 arium and bicristatum of Portugal and France, while the Kimmeridgian 

 species find their nearest relatives in the zone of Streblites tenuilobatus 

 of Baden, Oberbuchsitten, and Solothurn in Switzerland. 



It was not until late Portlandian time that genera of north European 

 origin invaded the Atlantic waters and reached Cuba and Mexico. Since 

 Simbirskites and Kossmatia have long been regarded as particularly char- 

 acteristic of the boreal sea which covered Russia, their occurrence at much 



28 Marjorie O'Connell : New species of ammonite opercula from the Mesozoic rocks of 

 Cuba. Am. Mus. Novitates, No. 28, 1921, 15 pp., 18 figs. 

 30 Manuscript not yet published. 



