SILURIAN OSTRACODA FROil NORTH AMERICA, ETC. 551 



B. From Mr. J. F. Wbiteaves, F.G-.S. 



B. a. § I. Upper Silurian ; Arisaig, Nova Scotia. 



1. Brimitia mimdula. J., variety. 



2. omta{J\ J. &H. 



'6. Beyrichia Uiberculata, Boll. Young. 



, var. 'pustulosa (Hall). 



, var. Bronni (Reuter). 



4. Beyrichia (equilatera, Hall. 



B. h. § II. Lower Silurian. 



§ 1. Trenton Limestone. 



1. Primitia, sp. 



2. Primitia mimdula, ,L 

 3. , variety. 



4. Lepcrdifia, sp. nov. ? 



5. BeyricJda, sp. nov. 



6. Polycope, sp. 



§ 2. Trenton Limestone. 



1. Leper ditia, sp. nov.? 



§ 3. Birdseye Limestone. 

 1. Leperditia, sp. nov. ? 



§ 4. Chazy Limestone. 

 §11. 1. Primitia, sp. 



, sp. 



§ I. 1. Isockilina Ottawa, J., variety. 

 § III. 1. Leperditia, sp. nov. ? 

 §11. 3. Polycope, sp. 



§ 5. Chazy Shales. 



1. Primitia mundula (?), J. 



2. Leperditia ? 



3. Beyrichia, sp. nov. 



A. Some Palseozoic specimens from Canada, sent by Mr. Henry M. 

 Ami, F.G.S., Assistant-Palaeontologist of the Geological Survey 

 of Canada, to me for examination, consist of : — 



§ I. Some pieces of hard, black, somewhat bituminous shale from 

 the Utica Formation at Eideau Street, New Edinburgh, Ottawa, 

 containing small obscure casts, very numerous on the bed-planes 

 and much squeezed. Primitia mundula, J., 1855 j and P. Ulrichi, 

 J., 1890, are barely distinguishable, and perhaps Leperditia (?) cy- 

 lindrical Hall. The following fossils are also present, as named by 

 Mr. Ami : — Trocliolites ammonius, Emmons, Lingula Proyne, Billings, 

 Leptobolus insignis, Hall, Zygospira modesta, Say. Also remains of 

 Trilo bites and Encrinites. 



§11. Isockilina Ottawa, Jones ('Ann. & Mag. 'Nat. Hist.' April 

 1858, p. ^48, pi. X. fig. 1), Variety : occurring — (1) abundantly on 

 the bed-planes of a piece of thin-bedded limestone, from a loose 

 block in Sussex Street, Ottowa, and probably belonging to the 

 Chazy Formation (upper portion). (2) Constituting, with a few 

 bivalve Molluscs, the greater part of an easily-broken grey lime- 

 atone from Nepeau, Ontario, Canada, belonging to the Chazy 

 Formation. 



