108 ME. R. L. SHERLOCK ON THE RELATIONSHIP OF THE [Feb. 191 1, 



' Catalogue of British Fossil Vertebrata,' it is described as a 

 ? Permian ichthyodorulite from Belfast. 



Alga? are notoriously unsatisfactory as fossils, and it is not 

 surprising that both the generic names seem to have been dropped. 

 Voltzia is retained by Dr. Kidston l as a Permian genus, and he 

 states that the specimens from Saxony in the British Museum 

 referred to V. liebeana Gein. appear to be the bracts of a Voltzia 

 cone. There are probably no palms in the Permian ; and Ouiliel- 

 rnites is a doubtful genus of Tertiary age (Schimper). 2 



Retaining the forms which are only ' probably ' from the Upper 

 Limestone, but leaving out the bad and doubtful species, which are 

 useless for correlation purposes, the following are left : — 



Plants. 

 Conifers. 

 Voltzia liebeana Geinitz. 



A N I M A L I A. 

 E.HIZOPODA. 



Dentalina permiana Jones. 

 Dentalina Jcingii Jones. 

 Tcxtularia triticum Jones. 

 Textularia cuneiformis Jones. 



Vermes. 



Spirorbis permianus King. 

 Serpula (l)pusilla Geinitz. 



Lamellibranchiata. 

 Avicula (Monotis) kazanensis de 



Vera. 

 Avicula (Monotis) garforthensis 



King. 



Lamellibranchiata (cont.). 

 Myalina hausmanni Goldf. 

 Bakevellia antiqua Miinster. 

 Leda vinti King. 

 Pleurophorus costatus Brown. 

 Schizodus obscurus (J. Sow.). 

 ? Edmondia elongata Howse. 

 Cleidophorus pallasi (de Vera.). 



Scapiiopoda. 

 Bentalium speyeri Geinitz 



Gastropoda. 

 Turbo helicinus Schlotheim. 

 Turbo permianus King. 

 Bissoa gibsoni Brown. 

 Natica minima Brown. 



Pisces. 

 Palcsoniscus longias&mus Agassiz. 

 Pcc'ceoniscus cat opt erics 



Considering the dates at which these fossils were named, it is 

 probable that, if they were examined by modern specialists, the 

 list would undergo considerable modifications. 



If we consider now the affinities of this fauna and flora, we find 

 that they are unquestionably Mesozoic. 



The Rhizopoda and the Serpula belong to living genera, although 

 none of them are of any importance from the point of view of 

 affinities. Of the Lamellibranchs, Zittel states that Avicula and 

 Leda are still living ; Pleurophorus ranged from the Devonian to 

 the Trias; Balcevellia is confined to the Permian, but the range of 

 the family to which it belongs (the Pernidae) is said to be from 

 the Permian to the present time. Zittel does not recognize either 

 Edmondia or Cleidophorus as occurring in the Permian, hence 

 these forms probably are wrongly named generically, and in fact 

 the Edmondia was queried by Geinitz. Schizodus occurs in the 



1 R. Kiclston, 1886, p. 17. 2 W. Ph. Schimper & A. Schenk, 1890, p. 372. 



