496 Systematic Paleontology 



Dunker^ based in the first instance on German Wealden material. A 

 number of species of Hausmannia have been subseqnently described 

 including a number of Bornholm specimens which are exactly similar 

 to the type of ProtorMpis but which Bartholin named Hausmannia 

 forcJihammeri." In reviewing this work Zeiller describes ^ and figures 

 additional material from the type locality for Protorhipis in Banat, 

 Hungar}^, and shows that the type of the genus was polymorphous and 

 closely related to the living genus Dipteris. This view is adopted by 

 Moller in 1902 in his revision of the Bornholm flora/ and by Eichter/ 

 who has still more recently elaborately gone over the whole ground anew. 

 This being the case Hausmannia has priority, having been published 

 seven years before Protorhipis, although both Seward and Knowlton 

 favor the retention of the latter as a purely form-genus. 



Eegarding the systematic position of ProtorMpis, it was originally 

 referred to the ferns by Andrae who compared his species with the 

 exisiting genus Platycerium. Other students compared these forms with 

 the modern genus Dipteris and both Bartholin and Zeiller found fructi- 

 fied material of the latter type. However, Saporta in his review of the 

 subject makes these forms conspicuous members of his Proangiosperms 

 and Ward two years later ^ not only follows Saporta's view but refers 

 the genus bodily to the Dicotyledons, including with it the Potomac 

 forms ProtecepJiyllum reniforme Fontaine, P. orticulare Fontaine and 

 Populophyllum reniforme Fontaine. These latter are in no wise related 

 to the true forms of Protorhipis {Hausmannia) which are undoubted 

 ferns of the Dipteris type, although they are somewhat similar to Proto- 

 rhipis Choffati Saporta from the Portuguese Barremian and Protorhipis 

 cordata Heer from the Kome beds, neither of which can be compared 

 with Protorhipis (sens stricto). The same may be said of Protorhipis 



^ Dunker, Mon. Norddeutsch. Weald., 1846, p. 12, pi. v, fig. 1. 

 ^ Bartholin, Nogle i den Bornholmske Juraform forkommende Plante- 

 forstenlnger, 1894, pp. 17, 48, pi. xi, figs. 4-6; pi. xli, figs. 1, 2. 

 ^ Zeiller, Rev. Gen. Botan., t. ix, 1897, p. 51, pi. xxi, figs. 1-5. 

 * Moller, Kgl. Fysiogr. Sallsk. Handl., xiii, 1902, p. 48. 

 ° Richter, Beitr. Fl. unteren Kreide Quedlinburgs, Teil i, 1906. 

 ^Ward, 16th Ann. Rept. U. S. Geol. Survey, pt. 1, 1896, p. 535. 



