SUBMERGED TLATEAU SURROUNDING CEYLON. 



79 



A comparison of the species of fishes and other forms of life 

 inhabiting these tanks, with those of the lagoons, both salt, brackish, 

 and fresh, at present situated on or near the coast line, would be of 

 great interest, and would possibly aid in the proof of the conjec- 

 tures as to their origin, which are here put forward on other grounds. 



Note to Commander Somerville's Article. 



Analyses of Sea Mud Deposits, hy M. Kelway Bamber, F.I.C., 



F.C.S., etc. 



Sample No. 1 is from 615 fathoms, 18 miles west by south from 

 Ambalangoda ; No. 2 is from 1,138 fathoms; No. 3 is from 1,180 

 fathoms, 20 miles west from Dodanduwa. All the samjjles were of a 

 gray brown coloiu", which became a greenish gray on drying. When 

 dry all passed through a mesh of 90 to the linear inch, or 8,100 per 

 square inch, the material being in an impalpable condition : — 



Chemical, Composition. 



Additional Note on bottom samples (see above, p. 72). — A sample from 

 133 fathoms taken on April 6, 1906, 14 miles west off the Clock 

 Tower, Colombo, consists of small calcareous nodules, and shells of 

 foraminifera and pteropoda (pelagic molluscs). Another sample from 

 165 fathoms, taken on the same date. 13 miles west on the northern- 

 most line, consists of a larger (1^" X 1" X i") porous calcareous nodule ; 

 this is exhibited in the Mineral Gallery at the Museum, together 

 with dried samples of the green mud from the gi'eater depths. 



