212 MESSES. BEADY, PAEKEE, AND JONES ON 



preferring to give with each species a reference to the page at which such particulars 

 are to be found in the ' Challenger' monograph. 



Abrohlos Island, or Abrohlos Rocks, as it is sometimes set down in maps, is situated 

 off the coast of South America, lat. 17° 53' S., long. 38° 34' W. ; that is to say, approxi- 

 mately fifty miles from the mainland and about halfway down the eastern coast-line of 

 Brazil — south of Bahia, a little south of Porto Seguro, and north of San Salvador. 

 The "Bank" extends from Porto Seguro to Cape Frio; its length from N.E. to S.W. 

 is 450 miles, its mid latitude 20° S., and its average reach 80 miles offshore. 



The material preserved was from eight soundings, ranging in depth from 940 fathoms 

 to 31 fathoms. Particulars from the oflBcial log are given below, together with a 

 general indication of the nature of the sea-bottom at the different points, the latter 

 taken mainly from Prof. Parker's notes on the material before it was prepared for 

 microscopical examination. 



"No. 1. 17th May 1857, viii. a.m. ; Lat. 19° 32' S., Long. 37° 51^' W. ; 940 fathoms; 

 mud." 



Whitish mud ; about three fifths consisting of fine yellowish-brown clay, with a 

 small quantity of very fine siliceous sand. Containing numerous Foramiuifera of the 

 usual Glohigerina-ooze types, together with some, like Amphistegina, more at home in 

 shallow water. 



"No. 2. 17th May 1857, v. 20 p.m. ; Lat. 19° 47' S., Long. 37° 58' W.; 31 fathoms; 

 coral." 



Fragments of NuUipore, with some fine sand. The chief organisms noticed were a 

 Cellepora (on the Nullipore), three species of Lejiralia, some small Gasteropods, and 

 a number of Foramiuifera, of which the more prominent belonged to the genera 

 Miliolina, Textularia, Biscorhina, and TruncatuUna. 



"No. o. 17th May 1857, viii. p.m. ; Lat. 19° 51|' S., Long. 37° 56' W. ; 32 fathoms; 



coral." 

 Chiefly fragments of Escham ; barren of Foraminifera. 



" No. 4. 23rd May 1857, ix. 20 a.m. ; Lat. 22° 54' S., Long. 40° 37' W. ; 260 fathoms ; 

 mud." 



Tenacious olive-brown clay, with a small percentage of fine siliceous sand, and some 

 black grains. Contained fragments of MoUuscan Shells and a few Polyzoa ; together 

 with Foraminifera of seventy species or more. 



"No. 5. 23rd May 1857, vi. p.m.; Lat. 23° 0' S., Long. 40° 48' W. ; 53 fathoms; 



coral." 

 Consisted mainly of Nullipore ; no Foraminifera observed. 



