106 MESSES. E. W. L. HOLT AND W. M. TATTERSALL— BISCATAN PLANKTON : 



EUPHAUSIA MilLLERI, Clatis. 



Hansen, in the later of bis papers referred to below has shown that this species is 

 apparently confined to the Atlantic and Mediterranean. 



Thysanopoda microphthalma ?, G. O. Sars. 



Sargasso Sea and Tropical Atlantic (' Challenger ') ; Indian Ocean ( Wood-Mason §(• 

 AlcocJv) ; Irminger Sea, off Greenland (Ortmann) ; Faroe Channel {Foioler) ; Bay of 

 Biscay {E. ^' T.). 



The geographical range of this species is therefore considerable, but the records are 

 isolated and many gaps exist. With regard to the records of this form by Ortmann and 

 Fowler, it may be noted that the former points out some differences between his 

 specimens and Sars's descriptions and figures. Fowler, whose examples from the Faroe 

 Channel agreed with those described by Ortmann, doubts the identity of the form 

 with Sars's species. The larvae from the Bay of Biscay which we have referred to 

 T. Qnicroplithalma, G, O. Sars, contribute nothing to the solution of this point, since they 

 are not far enough advanced in development. 



Megan rcTiPHANES nokvegica (M. Sars). 



This species is known from the temperate and Arctic waters of the Atlantic Ocean 

 and the Mediterranean, and its distribution has been completely traced from Portugal, 

 by way of the Atlantic coasts of Europe, across the Arctic Ocean to the Atlantic 

 coasts of North America. From the intermediate waters between Em^ope and America 

 it has not yet been recorded. This distribution is somewhat curious and tends to prove 

 that M. norvegica, though often going far from land, is not a truly oceanic form. It is 

 probably confined to the upper waters of the ocean, at least near its most seaward 

 limits. 



Thysanoessa gregaeia, G. O. Sars. 



The collection includes some specimens of TJnjsanoessa gregaria, a species to which 

 may belong, as we suspect, some mangled Biscayan examples which Caullery 

 (•' Campagne du Caudan," Ann. Univ. Lyon, 1896) has referred to the northern and 

 littoral (or sub-littoral) T. neglecta. 



T. gregaria seems to have an exceeding wide geographical range. It has been 

 recorded from the North, Equatorial, and South Atlantic, Mediterranean, Pacific from 

 Japan to the coasts of Australia, but some of the material, including possibly our own, 

 may prove to be referable to T. parva (Ha.nsen, op. cit. p. 25). 



Nematoscelis megalops, G. O. Sars. 



Off Nova Scotia and Buenos Ayres (' Challenger ') ; coasts of Great Britain and 

 Ireland {Norman, and E. §• T.) ; Bay of Biscay (S. Sf T.) ; seas off Greenland and 

 Labrador [Ortmann). 



Tliis is a truly oceanic form confined to the tropical and temperate waters of the 

 Atlantic and occasionally penetrating to the Arctic seas. 



