NOTES ON THE BRITISH JURASSIC BRACHIOPODA. 247 



Orthoidea, Friren, 1875. (Type : 0. Hasina Friren sp.) 



Etym. — opOo's, straight ; cTSo?, like. 



I have not seen any literature relating to Friren's Orthoidea 

 other than (Ehlert's, who considers that it is perhaps based 

 only on a young form of numismalis. 



This conclades the examination of the sections of Magel- 

 lania found in our country, as proposed by QEhlert. Space 

 will not permit of our entering into a fuller criticism of his 

 classification ; this must be postponed for another com- 

 munication. 



Since 1877 a very large amount of work has been done 

 in America and elsewhere in re-classifying the Brachiopoda 

 as a class, so much so that everything is thrown into ap- 

 parent confusion at present. However, we must not be 

 discouraged because an advance in our knowledge of the 

 evolution of the Brachiopoda necessitates the altering and 

 re-labelling of our specimens. 



A word or two respecting the distribution of the Magel- 

 lania in the Jurassic rocks. 



Davidson figured and described in his Monograph forty- 

 two species and thirteen varieties of Magellania {Wald.) as 

 occurring in the Oolitic and Liassic rocks of this country. 

 In this number he included Zeil. (?) humeralis, Roemer, 

 Glossothyris haherise, Dav., and an unnamed shell. 



The genus is represented in existing seas by some ten or 

 eleven species. 



The following species have been added since Davidson's 

 death : — ^ 



Zeil. rudleri, Walker and Buckman, Passage beds of the 

 Lower Calc.-grit of Suffield Heights, near Scarborough. 



1 Vide Appendix. 



