138 THE VOYAGE OF H.M.S. CHALLENGER. 
and most of the Pentacrinidz, have as yet been obtained at one or two localities only, 
and those not very widely separated. 
Table IT. on the preceding page gives the bathymetrical and geographical ranges, so far 
as yet known, of all the genera of recent Crinoids ; their distribution in the various oceans 
being indicated by the capital letters in the fourth column. <A few cases of uncertainty, 
owing to deficiency of information and other causes, are noted under the head of remarks. 
B. BaruymerricaL Rance. 
The frequency of occurrence of all the genera of recent Crinoids at depths below 250 
fathoms, so far as has yet been made known, is shown in Table III. One or two curious 
TaBLe III.—Showing the Frequency of Occurrence of all the Genera of Recent Crinoids 
at depths below 250 fathoms. 
Genus. 200-500 f. |500-700 f.|700-1200 f. 1200-2000 f. 2000-2500 00 -2900 f. Remarks. 
oa 
is) 
H 
Pentacrinus, . 7 oe ae Only four of the seven dredgings 
noted in the first column were at 
a greater depth than 250 fath, 
Metacrinus, . A 1 1 
Rhizocrinus, . : 10 8 5 2 sot xe A stem-fragment only at St. 323; 
1900 fath. Lat. 35° 39'S. (fide 
€.W.T.). 
Bathycrinus, . - pas Bs 4 4 1 
Hyocrinus,. . 5 r53 Bc8 aoe 2 1? es Possiblya young specimen from St. 
223, in N.W. Pacific, 2325 fath. 
(fide C.W.T.). 
Holopus, 
( At three of the Stations recorded in 
the first column (for each genus) 
Antedon, 5 2 16 6 + 2 son 2 the depth was between 200 and 
250 fath. Stations 1748, c, D 
Actinometra, . 5 1 (255, 610, and 210 fath.) are not 
recorded at all for either genus, 
owing to want of information, 
Eudiocrinus, . 5 1 2 2 
Promachocrinus, . 1 as oa 2 
Atelecrinus, 7 1? Lowest limit (Station 1740; 610 
fath.) uncertain. Possibly not 
below 450 fath. 
Thawmatocrinus, . mas si ies 1 
contrasts are noteworthy. While Bathycrinus and Hyocrinus are essentially abyssal 
forms, Actinometra is not known with certainty to occur below 533 fathoms, and has 
not been obtained more than seven times below 200 fathoms.* Pentacrinus, having a 
1 Comatul were dredged at Stations 1748, 1740, 174, the depths being respectively 255, 610, and 210 fathoms ; 
but there is no record of the particular haul which yielded the Comatule. 
wre an 
