672 
THE VOYAGE OE H.M.S. CHALLENGER. 
which occurred at or below the depth of 1000 fathoms. A list of these, according to 
their bathymetrical distribution, is subjoined, giving also the geographical region and 
the nature of the bottom. The list includes about fifty species belonging to twenty 
Pig. 227 . — Farciminaria cribraria, Busk, a, one- 
third. the natural size ; b, magnified. 
Pig. 228. — Farciminaria pacific, Busk, a, natural size ; 
b, magnified ; c, ocecium, more highly magnified. 
genera in thirteen families, but of these the eighteen marked with an asterisk occur also 
at depths less than 1000 fathoms, so that the exclusively abyssal forms in the collection 
are reduced to about thirty-four. 
Below 3000 fathoms. 
Family. 
Genus and Species. 
Station. 
Depth. 
Bottom. 
Region. 1 
Bifaxariadse, 
Bifaxaria abyssicola, . . 
253 
3125 
red clay. 
N. Pacific. 
Cribrilinidse, 
* Gribrilina monoceros, 
253 
3125 
§ 
Bicellariadse, 
Bugula jolinstonice, 
253 
3125 
» 
Escharidse, . 
Phylacitella, sp. 1 . - 
253 
3125 
,, 
A ■ 
But of these the last two were too fragmentary to admit of certain determination. 
For these regions see the map in the Report, Zool. Chall, Exp., part xxx., 1884. 
