cHap, V1.] DEEP-SEA DREDGING. 279 
chief of which was a new crinoid belonging to the 
genus Bourguetticrinus of D’Orbigny; it may even 
be the species named by him B. hotessieri, which 
occurs fossil in a recent formation in Guadaloupe, 
but of which only small pieces of the stem are 
known. I obtained half-a-dozen specimens between 
230 and 3800 fathoms, unfortunately more or less 
injured by the dredge. The deepest cast made was 
in 517 fathoms; it gave a very handsome JJopsea 
and some annelids.”’ 
The results of the ‘ Lightning’ cruise in 1868, in 
which dredging was successfully carried down to 650 
fathoms, have already been recorded. 
In the summer of 1870, Mr. Marshall Hall, F.G:S., 
with an interest in science which is unfortunately 
rare among yachtsmen, devoted his yacht ‘ Norna’ 
to deep-sea dredging work during a cruise along 
the coasts of Portugal and Spain. If we may judge 
by several preliminary sketches which have from 
time to time appeared at the hands of Mr. Saville 
Kent, the collections made during this expedition 
must have been extensive and valuable.’ 
The last researches in order of time are those 
conducted on board H.M.S. ‘ Porcupine’ in 1869 and 
1870. With the use of a Government surveying 
ship well found in all necessary appliances every- 
thing was in our favour, and, as has been already 
told, dredging was carried down to 2,435 fathoms ; 
* American Journal of Science, vol. xevi. p. 413. 
2 Zoological Results of the 1870 Dredging Expedition of the Yacht 
‘Norna’ off the coasts of Spain and Portugal, communicated to the 
Biological Section of the British Association, Edinburgh, August 8, 
1871. Nature, vol. iv. p. 456. 
