1870. BRADY — OX BIVALVE CRUSTACEANS. 379 



and amoDg the rest the crusts of the OstracoJa. These being 

 somewhat numerous and varied, were sent to Mr, Brady, of 

 Sunderland, wlio is the best living authority on these curious 

 creatures, and who kindly undertook their determination. The 

 results have just been published by him in the ''Annals of 

 Natural History," and are reprinted below as an interesting 

 contribution to a little known department of Canadian Natural 

 History. 



We may add that the original specimens mounted by Mr. 

 Brady, will soon be in this city, and will be available for purposes 

 of comparison by any naturalist who may care to study these 

 little creatures. — Ed. 



Feb., 1871. 



RECENT OSTRACODA FROM THE GULF OF ST. LAWRENCE. 



By George Stewardson Brady, C.M.Z.S. 



The specimens which form the subject of the present notice 

 have been kindly placed in my hands by Dr. Dawson, of Montreal, 

 for examination and description. They were .selected by Mr. G. 

 M. Dawson from dredgings and soundings made in various parts 

 of the Gulf of St. Lawrence, in depths varying mostly from 10 to 

 50 fathoms, but in one case reaching 250 fathoms. The following 

 is the list of species : — 



Argilloecia, sp. Cytheridea punctillata, Brady. 



Cy there leioderma, Norman. Sorbyana, Jones. 



kitea, Midler. \ % elongata, Uradi/. 



pellucida, Baird. 

 emargiuata, Sars, sp 

 coucinna, Jones. 

 tuberculata, Sars. 



Eucythere Argus, Sars, sp. 



Loxoconcha, sp. 



Xestolcberis depressa, Sars. 



Cytherura uudata, Sars (var.) 



canadensis, nov. sp. pumiJa, C, B, </• R. (MS.) 



villosa, >Sars. Pconcentrica, C.,7?.c|"-/i.(MS) 



dunelmensis, Norman, sp. i Cytheropteiou nodosum, Brady. 



Dawsoni, nov. sp. Bytbocythere turgida, Sars. 



abyssicola, Sars. sp. Cytberideis foveolata, nov. sp. 



(?) 'Wbiteii, Baird, ^^. ? Pbilomedesinterpuueta, Baird, sp. 



eostata, Brady. Bradycinetus, sp. 



Cytberidea papillosa. Bosquet. 



The determination of these species has been a most perplexin"- 

 task, owing to their variation in most cases from the types as 

 known to us on this side of the Atlantic. It is probable, indeed 

 that many which I have here identified with well-known species 



