1883.] 



On Syringammina. 



155 



of dark lines in the coronal spectrum, that doubt is now completely 

 removed. 



The results have amply proved the value of the photographic 

 method employed, and it has been shown how an eclipse of only 

 seventy seconds' duration can be made to yield important information. 



IV. Note on Syringammina. a New Type of Arenaceous Rhizo- 

 poda." By Henry B. Brady, F.R.S. Received April 10, 

 1883. 



[Plates 2, 3.] 



The specimens to which the following note refers were dredged in 

 the Faroe Channel in the autumn of last year, during the cruise of 

 H.M.S. "Triton," and were sent to me for examination by Mr. John 

 Murray, F.R.S.E., under whose direction the scientific observations of 

 the expedition were carried out. 



It is now a well-known fact that the region lying between the north 

 coast of Scotland and the Faroe' Islands possesses certain features of 

 unusual interest owing to the existence, side by side, of two sharply 

 defined areas, of which the bottom temperature differs to the extent 

 of 16° or 17° Fahr. The depth of the two areas is very similar, ranging 

 from 450 to 640 fathoms, and they are separated by a narrow riclge 

 having an average depth of about 250 fathoms. The physical aspects 

 of this phenomenon have been the subject of much discussion, and 

 the biological conditions attendant thereupon are of almost equal 

 importance ; indeed, so far as the Rhizopoda are concerned, there are 

 few areas of the same extent that have so well repaid the labour of 

 investigation. On the " Lightning " Expedition of 1868, super- 

 intended by Dr. Carpenter and Sir Wyville Thomson, the cold area 

 furnished amongst other interesting organisms, the large Lituoline 

 Foraminifer Beophax sabulosa, a form which has since been obtained 

 near the same point on the cruise of the "Knight Errant," but has 

 never been met with elsewhere. The warm area yielded at the same 

 time Astrorhiza arenaria, a large sandy species previously unknown to 

 British naturalists. On the " Porcupine " Expedition of 1869, another 

 modification of the latter genus, Astrorhiza crassatina, was obtained in 

 the cold area; and near the boundary line an entirely new arenaceous 

 type was dredged, to which the generic named Botellina has been 

 assigned by Dr. Carpenter. From the fact that all the specimens of 

 the form appeared more or less broken, it has been inferred that the 

 tests were adherent when living ; but the fragments were abundant, 

 and consisted of stout tubes, many of them upwards of an inch 

 in length, the interior being subdivided by a labyrinth of irregular 



