KCHINOUERMS. 

 Reduced analyses ofophiurans. 



31 



SiO., 



(Ai;FeU\ 



OaCOj 



CaSO^ 



I 



2.39 



.84 



9.53 



86.60 



.64 



(?) 



100. 00 



0.24 



.11 



14.08 



85.09 



.18 



.30 



100. 00 100. 00 100. 00 



0.16 



.70 



14.56 



81.02 



Trace. 



3.56 



100. 00 



0. 66 



.85 



14. 95 



79.37 



Trace. 



4.17 



100. 00 



SiOj 



(Al, Fe),03 



Mgco,::.. 



CaCOa 



Ca^PoOg... 

 CaSOj 



12.97 

 84. 44 

 . 14 

 1.98 I 



100. 00 



^00. 00 



10 



11 



100. 00 



0.25 



2.92 



8.39 



88:44 



Trace. 



Trace. 



100. 00 



0.39 



.44 



8.01 



91.16 



(?) 

 (?) 



12 



100. 00 



0.00 



2. 20 



8.24 



89.50 



Trace. 



Trace. 



100. 00 



13 



14 



SiOj 



(Al. Fe),03 



MgCOj 



OaCO, 



CajPA- ■ - 

 CaSO^ 



0.00 



.69 



6.61 



92.70 



Trace. 



Trace. 



0.00 



1.08 



7.62 



91.30 



Trace. 



Trace. 



100. 00 



100. 00 



15 



16 



0.00 



1.09 



13.38 



85.53 



Trace. 



Trace. 



0.00 



1.12 



12.05 



86.83 



Trace. 



Trace. 



0.00 



3.47 



10.19 



86.34 



Trace. 



Trace. 



100.00 100.00 



100. 00 



Some of these analyses are obviously incomplete, for phosphates and sulphates were not 

 determined, because of insufficient material. A number of the specimens analyzed were frag- 

 ments, and in that respect the analyses are not altogether satisfactory. In the following table 

 the data are presented as in the tables for the other echinoderms; the figures for the two speci- 

 mens of Ophiomyxaflaccida are averaged. The localities and latitudes are abbreviated as usual. 



Percentage of mngnesium carbonate in ophiurnns. 



Locality. 



Ophiomusium l>Tnani Galapagos. 



Ophiocoma aethiops Gulf of California. 



Ophiocamax fasciculata Caribbean Sea. 



OphiophoUs aculeata Unalaska. 



Ophioglypha lymani Chile. 



Gorgonocephalus eucnemis Japan. 



Gorgonocephalus arcticus Cape Cod . 



Gorgonocev)lialus caryi Alaska 



Ophioglypha sarsii . ." i Station 2176 



Ophioglypha lutkeni j California. . . 



Ophiothnx angulata [ Cuba 



Ophiocoma crinaceus I Hawaii 



Ophiocoma pumila I Tobago 



Ophionereis eurjbrachiplax . , Japan 



Ophioderma cinereum Culebra 



Ophiomyxa flaccida ; Tobago 



Temper- 

 ature. 



2.9 



(?)"" 

 10.4 



(?) 

 11. 1 



(?) 

 (?) 

 (?) 

 5 



(?) 

 (?) 

 (?) 

 28 



(?) 

 (?) 

 28 



MgCO, 



Per cent. 



6 61 



7.04 



7. 62 



S. 01 



H. 24 



8.39 



9.53 



9.66 



9.84 



10. 19 



Il.{)8 



12.05 



12.97 



13.38 



14.08 



14.75 



In this table the relation between magnesium carbonate and temperature is less regular 

 than it was with the other echinoderms. Some of the low percentages are unaccountably low; 

 but the last six in the series show percentages characteristic of warm-water organisms. One 

 106135—22 3 



