622 Brady and Norman — Monograph of the Marine and Freshwater Ostracoda 



Section III. — Cladocopa. 



Pohjcope orlicularis, G. 0. Sars. Polycope dentata, G. S. Brady. 



„ punctata^ G. Oc Sars. . Po^ycojt?s«seompress«, Brady and Robertson. 



Section IV. — Platycopa. 

 Cytherella abyssorum, G. 0. Sars. Cytherella l(Bvis, G. S. Brady. 



We indicated our views in the first part of this Monograph, that for zoological 

 purposes the North Atlantic should be considered as defined southwards by 

 lat. 35° N., beyond which we would style the Ocean the Tropical Atlantic ; but 

 having received from the Marquis de Folin a number of abyssal forms taken by 

 the French Government expeditions, in the " Travailleur" and the " Talisman," 

 off the coast of Morocco, we have thought it advisable to include these species, 

 inasmuch as living in very deep water at or near freezing point, it was probable that 

 they would hereafter be found in the bed of the Atlantic further north. The species 

 thus obtained consist of many most interesting forms which have been picked out 

 by the Marquis from the dredged material of these expeditions, and for enabling 

 us to describe the species we are deeply indebted to him. We have also included 

 here the Mediterranean species, which were excluded from the Fodocopa as being 

 so numerous. 



To Professor G. 0. Sars we owe our sincere thanks for some Norwegian 

 species. To Dr. John Murray we are indebted for some Conchoeciidoe procured 

 in the tow-net during the " Triton" Expedition in 1882, including the remark- 

 able Conchoecilla lacerta. Mr. T. Scott and Mr. D. J. Scourfield we have to thank 

 for their kindness in supplying us with specimens of some Podocojm, which are 

 described in the Appendix. 



To Professor Haddon we are indebted for a tow-net gathering from 220 

 fathoms taken 40 miles N. N. W. of Achill Head on the west coast of Ireland, 

 which contained some very interesting Conchoeciidce. 



In the Appendix just referred to will be found additional notes respecting the 

 nomenclature &c., of certain forms contained in the former portion of this 

 Monograph, as well as descriptions of new species since added to the fauna of 



N. W. Europe. 



In consequence of the small size of Ostracoda it is extremely difficult to procure 

 spirit-preserved specimens from the deep sea, and although the Ilyodocopa, being 

 much larger than the Podocopa, would be detected by the experienced eye of a 

 Carcinologist who had studied them, yet the Zoologists usually attached to 



