ECHINODERMS. 1^ 



The reduced analyses arc as follows, rejecting organic matter and water and recalculating 



Reduced analyses of crinoid skeletons. 



to 100 per cent: 



SiO, 2.01 



^^^^*^' :::::::::::::::::::::::::::: 7:9! 



J^v.-v.v.v.v.v:::::: , S8.48 



Oa,PA L!1 



; 100. 00- 



0.05 



.48 



9.44 



89.45 



.58 



1.57 



1.41 



9.25 



87.77 



Trace? 



0.48 



.91 



10.15 



87.34 



1.12 



100.00 ' 100.00 I 100.00 



0.21 



.78 



12.69 



86.32 



Trace. 



100. 00 



SiO, 0.05 



(Al,Fe)A .-ll 



MgC03 nil 



CaCO,. I S6.46 



Ca-ai oUa ' 



100. 00 



0.08 



.10 



10.16 



89.66 



Trace. 



0.47 



.59 



11.08 



87.86 



Trace. 



10 



0.24 



.22 



12.34 



86.93 



.27 



100. 00 i 100. 00 100; 00 



11 



0.21 



.24 



11. la 



87.94 



.48 



100. 00 



13 



SiO, I 0-^2 



(Al,Fo)A I -f^ 



MgCOa 1 10.09 



CaCO, 8'- 16 



CajPjb, , Trace. 



100. 00 



i 



14 



15 



0.05 



.30 



11.69 



87.96 



Trace. 



0.03 



.08 



11.69 



88.20 



Trace. 



16 



0.10 



.21 



11.42 



88.27 



Trace. 



17 



0.04 



.21 



11.62 



88.13 



Trace. 



100.00 100.00 



19 



20 



21 



22 



23 



SiO, I 002 



(Al.Fe^A I -f^ 



MgCO, 1 11" 



CaCO, ' 87.51 



CajPjOg ,„","' 



CaSO, I ■ ^•' 



100.00 



0.05 



.62 



13.37 



85.48 

 .48 

 (?) 



0.06 



.27 



9.87 



89.80 



Trace. 



(?) 



100.00 100.00 I 100.00 I 100.00 



0.14 



.74 



12.20 



85.81 



1.11 



100. 00 



12 



5.73 



.56 



9.36 



83.47 

 .88 



100. 00 



18 



0.17 



.29 



11.96 



87.58 



Trace. 



100.00 100.00 I 100.00 



24 



0.54 



.51 



13.74 



83.13 



.64 



1.44 



100.00 



With these analyses the two made by Mr. Palmer may be advantageously compared, 

 although they were not quite so elaborate. The data are as tollows: 



25. Heliometra glacialis var. maxima. Iwanai Bay, northeastern part of the Sea of Japan; latittide. 43" 01' 40" N. ; 

 depth, 315 meters; temperature, surface, 20.5° C, bottom, 1.5° C. 



26. Metacrinus rotundas. Eastern Sea, off Ka-oshima Gulf, southern .Japan; latitude, 30 58 30 ^., depth, .i/» 



meters; temperature, surface, 27.8° C, bottom. 13.3° C. 



In No. 24, which contained much organic matter, Mr. Palmer found 2.68 per cent MgO 

 ( = 5.61 MgCO,) and 40.03 CaO ( = 71.48 CaCO,). In No. 25, with n.. organic matter, he found 

 4 89 MgO ( = 10.29 MgCO,) and 49.95 CaO ( = 89.19 CaCO,). Assuming that the crmoid skele- 

 tons consist essentially of carbonates, and recalculating to 100 per cent, we have as the content 

 of magnesium carbonate in these crinoids — p^^ ^^^ 



. 7.28 



25. Heliometra glacialis var. maxima _ „ . 



26. Metacrinus rotundus 



