the Palceozoic Bivalved Entomostraca. 59 



From the " Caradoc " or ^^ Bala-Caradoc " formation there 

 are some other Bivalved Entomostraca known, namely : — 



I. Primitia strangulata^ Salter, sp. Ann. Nat. Hist. ser. 3. 



vol. xvi. p. 416 ; from Coniston Waterhead, Lancashire ; 

 and found also in the ^^ Brandschiefer " * of the Baltic 

 Provinces, according to Schmidt. 



1 a. , var. a, op. cit. p. 417. Robeston Wathen, Pem- 



brokeshire. 



2. Salteriana^ J. & H., op, cit. p. 417. Sholes Hook, 



Haverfordwest ; in the " Brandschiefer " of Wannemois 

 and in the Borkholm bed (Schmidt). 



2 a. , var. crenulata^ Schmidt, op. cit. p. 417. Pag- 



gar and Borkholm. 



3. semicordataj J. &H., op. cit. p. 417. Sholes Hook, 



Pembrokeshire. 



4. matutina^ J. & H., op. cit. p. 418. Cheney Longville, 



Shropshire. 



5. simplex.^ Jones, op. cit. p. 417. Harnagef; Shrop- 

 shire ; and in the Llandeilo schists of Busaco, Portugal. 



6. hicornisj Jones, op. cit. p. 420. Harnage. 



7. nana J J. & H., op. cit. p. 420. Harnage. 



8. Leperditia [Primitia?] minuta (Eichwald, sp.), Schmidt, 

 Untersuchungen, p. 194; in the Brandschiefer and the 

 Wessenberg and Borkholm beds. 



9. [ ?] hrachynothaj Schmidt, Untersuch. p. 195; 



Borkholm. 



10. [ ?] ohliqua^ Schmidt, Untersuch. p. 195 ; Bork- 

 holm. 



II. BeyricJiia complicata^ Salter. Abermarchant &c. (See 



Ann. Nat. Hist. ser. 2. vol. xvi. pp. 164 &c.) This spe- 

 cies occurs also in the Llandeilo rocks of Wales, and in 

 the "Brandschiefer" of the Baltic Provinces (Schmidt). 

 12. affinisXj Jones. Tramore, Ireland. Op. cit. p. 171. 



* This Brandschiefer is in the uppermost part of the lowest Silurian 

 group of the Baltic Provinces of Russia ; and the Borkholm bed lies 

 higher up, being the uppermost of the Lower Silurian beds. See F. 

 Schmidt's ' Untersuchungen iiber die Silurische Formation von Esthland, 

 Nord-Livland und Oesel,' 8vo, Dorpat, 1858 ; and Quart. Journ. Geol. Soc. 

 vol. xiv. pp. 43 et seq. 



t The Lower Silurian schists at Harnage (near Shrewsbury, in Shrop- 

 shire), which yield these little Entomostracans, are regarded by the 

 Geological Surveyors as belonging to the Caradoc-Bala formation. Mr. 

 Salter, however, thinks that they may be of Llandeilo age. 



X In the last edition of 'Siluria,' at page 516, this species is placed by 

 mistake in the Llandeilo column of the Table of Silurian Fossils, and B. 

 Barrandiana (a Llandeilo fossil) in the Caradoc Column. 



