the Paleozoic Bivalved Entomostraca. 59 
From the “ Caradoc” or “ Bala-Caradoc”’ formation there 
are some other Bivalved Entomostraca known, namely :— 
1. 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. 
, Var. a, op. cit. p. 417. Robeston Wathen, Pem- 
brokeshire. 
la. 
2. Salteriana, J. & H., op. cit. p. 417. Sholes Hook, 
Haverfordwest; in the “ Brandschiefer’’ of Wannemois 
and in the Borkholm bed (Schmidt), 
2a. , var. crenulata, Schmidt, op. cit. p. 417. Pag- 
gar and Borkholm. 
3. semicordata, 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. Harnaget, Shrop- 
shire; and in the Llandeilo schists of Busaco, Portugal. 
6. bicornis, Jones, op. cit. p.420. Harnage. 
te nana, J. & H., op. cit. p.420. Harnage. 
8. Leperditia |Primitia?] minuta (Kichwald, sp.), Schmidt, 
Untersuchungen, p. 194; in the Brandschiefer and the 
Wessenberg and Borkholm beds. 
[ ?| brachynotha, Schmidt, Untersuch. p. 195; 
Borkholm. 
[ 
holm. 
11. Beyrichia complicata, Salter. Abermarchant &e. (See 
Ann. Nat. Hist. ser. 2. vol. xvi. pp. 164 &e.) This spe- 
cies occurs also in the Llandeilo rocks of Wales, and in 
the “ Brandschiefer”’ of the Baltic Provinces (Schmidt). 
afinist, Jones. 'Tramore, Ireland. Op. cct. p. 171. 
9. 
10. ?] obliqua, Schmidt, Untersuch. p. 195; Bork- 
12. 
* 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 tiber die Silurische Formation von Esthland, 
Nord-Livland und Oesel,’ 8vo, Dorpat, 1858 ; and Quart. Journ. Geol. Soe, 
vol. xiv. pp. 45 et seq. 
+ 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. 
{ 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 2B. 
Barrandiana (a Llandeilo fossil) in the Caradoc Column, 
