1878.] 



Mr. T. Davidson. On Brachiopoda. 



431 



82 to 102 fms. Terebratella sp. (?) perhaps T. Erieli. Dav. 



100 



150 „ 



Platydia anoinioides. Scacchi. 



100 „ 



150 „ 



Waldheimia Kerguelensis. Dav. 



120 





Megerlia Willemoesi. Dav. 



120 „ 



600 „ 



Terebratula viva. Urod. 



150 





Terebratula vitrea, var. minor. Philip'pi. 



150 





Kraussina pisum. Lam. 



150 





Rhynchonella nigricans, var. pixidata. Willemoes Sub.ni M.S. 



210 





Terebratula Moseleyi. Dav. 



350 





Terebratulina Cailleti. Crosse. 



390 





Maeasella, so. 



390 





Terebratulina Wyvilli. Dav. 



420 



55 



Terebratula Cubensis. Pourtales. 



600 



5 



Terebratulina Murrayi. Dav. 



1,340 





Terebratella Frieli. Dav. 



1,875 



JJ 



Terebratula or Terebratulina (?) Dalli. Dav. 



1,850 





Megerlia (?) incerta. Dav. 



1,850 to 2,180 , 



Discina Atlantica. King. 



1,035 „ 



2,600 „ 



Terebratula Wyvilli. Dav. 



],900 





Terebratula ? (undeterminable fragments) . 



2,160 





Waldheimia Wyvilli. Dav. 



The following table shows approximately how many times Brachi- 

 opoda were dredged at certain depths : — 



99 dredgings 



in depths of from 



1 to 



500 fms. 



21 times. 



30 



)> 



501 „ 



1,000 



jj 



4 



47 



JJ 



1,001 „ 



1,500 





3 



47 



JJ 



1,501 „ 



2,000 



jj 



4 



92 



J> 



2,001 „ 



2,500 





1 



83 



JJ 



2,501 „ 



3,000 





1 (at 2,600 fms.) 



5 



JJ 



3,001 „ 



3,500 



5> 



none 



5 





3,501 „ 



4,000 



}} 



none 



none „ 



J) 



4,001 „ 



4,500 



JJ 



none 



1 



JJ 



4,501 „ 



4,575 



JJ 



none 



Thus, it becomes apparent that Brachiopoda do not generally abound 

 in depths exceeding 500 or 600 fathoms, or less ; but out of 125 

 dredgings, in depths of from 1 to 600 fathoms, Brachiopoda were 

 brought up twenty-one times only ; while in depths varying from 600 

 to 2,600 fathoms, Brachiopoda were obtained ten or eleven times. 

 The depths for some of the species, however, varied in localities not 

 visited by the ' Challenger,' as recorded in the general list. 



In order to obtain some approximate data as to the depths Brachi- 

 opoda are at present known to inhabit, it will be desirable to append a 

 list of all the known recent species, with an indication of all their 

 respective depths. 



A point of interrogation has been placed before uncertain species, or 

 not sufficiently determined species or varieties ; and an asterisk before 

 those dredged in the ' Challenger' Expedition. 



