318 A.J. Jukes-Browne & R. B. Newton — Devonian Fossils. 



Strophomena tceniolata. Prom the preceding notes it will be seen 

 that the Orthoceras is now identified as 0. speciosum, Miinster 

 (a Middle and Upper Devonian form) ; that the record of Spirifer 

 primcevus was probably based on the casts of S. speciosus ; that the 

 true Orthis hjsterita, Linn., does not occur, the form in question being 

 the 0. striatula of Schlotheim. Finally, the species regarded by 

 Mr. Whidborne as Stropheodonta tceniolata must be identified with 

 a variety of St. inter strialis, Phil., a well-known Middle and Upper 

 Devonian species. 



Thus the testimony which seemed to turn the scale in favour of 

 a Lower Devonian age for the fauna has completely vanished, while 

 strong new evidence for its being of Middle Devonian age has been 

 discovered in the recognition of Anarcestes lateseptatus, Orthoceras 

 speciosum, Bellerophon tmmdus, Clorinda irevirostris, Orthis inter- 

 lineata, Sehizophoria striatula, Spiriferina insculpta, and Stropheodonta 

 interstrialis (var. nodulosa). 



The following table shows the range of the species as now identified, 

 and makes it certain that the affinities of the fauna are with the 

 Middle and not with the Lower Devonian. All the species which 

 have been identified with previously known forms occur in the Middle 

 Devonian, either of this country or of Germany, while only seven of 

 them have also been found in the Lower Devonian. 



