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 Eocks, 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 off shore. 



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

 to 31 fathoms. Particulars from the official 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, vm. 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 Foraminifera of the 

 usual Globigerina-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 Nullipore, with some fine sand. The chief organisms noticed were a 

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

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

 Miliolina, Textularia, Discorbina, and Truncatulina. 



"No. 3. 17th May 1857, vm. p.m. ; Lat. 19° 51f S., Long. 37° 56' W. ; 32 fathoms; 



coral." 

 Chiefly fragments of Eschara ; 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 Molluscan 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. 



