CHAP. I. ] INTRODUCTION. Oi 
much corroded. Shortly afterwards the cable gave 
way in a depth of 1,200 fathoms, at a distance of one 
mile from the spot where the electrical tests showed 
that the cable had been previously broken. 
With these 40 miles of cable much coral and many 
marine animals were brought up, but it did not appear 
that their presence had injured the cable, for they 
were attached to the sound as well as to the corroded 
portions. On his return, Mr. Fleeming Jenkin sent 
specimens of the animals which he had himself taken 
from the cable, noting the respective depths, to Pro- 
fessor Allman, F.R.S., for determination. Dr. Allman 
gives a list of fifteen animal forms, including the ova 
of a cephalopod, found at depths of from 70 to 1,200 
Fic. 4.—Caryophyllia borealis, FLeminc. Twice the natural size. No. 45 
fathoms. On other portions of the cable species of 
Grantia, Plumularia, Gorgonia, Caryophyllia, Alcy- 
onium, Cellepora, Retepora, Eschara, Salicornaria, 
Ascidia, Lima, and Serpula. Y observe from Professor 
