948 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [NoV. 29, 



In concluding the lists of the Brachiopoda and Conchifera pro- 

 cured during the Expeditions of H.M.S. 'Lightning' and 'Porcupine' 

 from 1868 to 1870, I may explain that the delay of publication, 

 although considerable, was unavoidable ; but it has not been without 

 some compensation. Since that period several important and exten- 

 sive deep-sea explorations have been made from Germany, Norway, 

 Holland, France, Italy, the United States, Canada, and Great Britain, 

 the results of which have greatly tended to increase and improve our 

 knowledge of the geographical and hydrographical distribution of the 

 Molhisca in the North Atlantic. Moreover the careful investigation 

 of the Tertiary and Post-tertiary shells by Professor Seguenza and a 

 host of other able palteontologists has enabled us to ascertain more 

 exactly the range of their geological position. I should be inclined 

 to regard as last in the order of scientific value the discovery of what 

 are called "new species." We know very httle — too little — of the 

 abyssal fauna ; but it is evident that every exploration of the oceanic 

 bed must produce an endless number of hitherto unpublished forms, 

 to say nothing of those forms which some naturalists, anxious for 

 that kind of fame, continually contrive to manufacture out of the 

 varieties of recorded species. 



Supplement to Parts I., II., III. 



Part I., P.Z.S. 1878:— 



Page 398. With respect to the so-called genus W^aldheimia, my 

 friend Mr. Davidson, in his Report on the Brachiopoda 

 from the 'Challenger' Expedition, says that "there 

 exists in the dorsal valve of TFaldhevnia a median septum, 

 which is not present in Terebratula." But some of 

 those species of Terebratula which he there places in 

 Waldheimia (e. g. T. cranium and T. tenera) have no 

 such septum. Rhynchonella 'psittacea has no septum, 

 while B,. sicula has one. That character, therefore, 

 will not serve for generic distinction. 



P. 399. Jr(iiope cistellula. Fossil. Calabria. 

 „ Platydia anomio'ides. Fossil. Calabria. 



P. 400. Rhynchonella sicula. Fossil. Calabria. 



,, Crania anomula. Fossil. Monte Mario and Calabria. 



P. 401. Terebratula caput-serpentis. The range of depth for other 

 localities, besides those given for the ' Lightning ' and 

 ' Porcupine ' Expeditions, should be 400 fms. The 

 variety mediterranea is T. emarginata of Risso. 



P. 402. Terebratula tubcrata. North of Spain (' Travailleur ' 

 Exp., 1881). 

 „ Terebratula suhquadrata. Bay of Biscay (' Travailleur ' 

 Exp.), very young specimens ; 645 fms. 



P. 404. Terebratida vitrea, var. sphendidea. N. Spain ('Travail- 

 leur' Exp., 1881). 



P. 405. Terebratula cranium. Bay of Biscay ('Travailleur' Exp.) 

 1011 fms. 



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