GEOCHEMISTRY: CLARKE AND WHEELER 
263 
pods representing as many genera in the calcareous group. The species 
analysed are as follows: 
1. Terehratula cubensis, Pourtales. Coast of Florida. 
2. Terehratulina septentrionalis , Gray. Eastport, Maine. 
3. Laqueus calif ornicus, Koch. Esteros Bay, California. 
4. Rhynchonella psiltacea, Gmelin. Shetland Islands, 
5. Crania anomala, Miiller. Coast of Norway. 
Actual analyses 
1 2 3 4 5 
Si02 0.06 0.50 0.18 0.14 0.21 
(Al, Fe)203 0.04 0.14 0.47 0.23 0.26 
MgO... 0.44 0.62 0.32 0.23 3.90 
CaO 54.96 51.79 54.48 53.76 48.67 
SO3 0.21 0.66 0.21 0.31 0.97 
P2O5 trace trace trace 0.17 0.25 
Loss on ignition 44.35 45.28 44.46 44.81 45.38 
100.06 98.99 100.12 99.65 99.64 
CO2 calculated 43.42 40.55 42.91 42.16 40.88 
Organic matter* 0.93 4.73 1.55 2.65 3.52 
* Approximate. Loss on ignition minus CO2. 
Rejecting organic matter and recalculating to 100%, the analyses 
assume the following rational form. 
Revised analyses 
1 2 3 4 5 
SiOi 0.06 0.52 0.18 0.15 0.22 
(Al, Fe)203 0.04 0.15 0.48 0.23 0.27 
MgCOg 0.93 1.37 0.68 0.49 8.63 
CaCOs 98.61 96.78 98.30 98.20 88.59 
CaS04 0.36 1.18 0.36 0.55 1.72 
Ca3P208 trace trace trace 0.38 0.57 
100.00 100.00 100.00 100.00 100.00 
For comparison, the analyses of the following calcareous brachiopods, 
made elsewhere, are significant: 
6. Terehratula sp. Collected by Pourtales between Florida and Cuba. 
S. P. Sharpies analyst.^ 
7. Terehratulina caput serpentis. Locality not given. F. Kunckell 
analyst.^ 
8. Crania anomala, Miiller. Locality not given. Kunckell, analyst. 
9. Waldheimia cranium, Miiller. Locahty not given. Kunckell, 
analyst. 
10. Waldheimia cranium, Miiller. Collected by Norwegian North 
Sea Expedition, Station 255, latitude 68°. 12' N., longitude 15°.40' E., 
in 624 metres depth, and at bottom temperature 6°. 5 C. 
