The strontium-calcium atom ratio in carbonate-secreting marine organisms 



33 



Table I (conf.) 



FAMILY PLEUROPHORIDAE 



Cyprina islandica \ N. H. 



FAMILY CLINOCARDIIDAE 



Clinocardium nuttallii 

 C. nuttallii 

 C. nuttallii 



Wash. 

 Wash. 

 Calif. 



FAMILY VENERIDAE 



Compsomyax subdiaphcma 

 Irus lamellifer 

 Protothaca staminea 

 P. staminea 

 P. tenerrima 

 Saxidomus giganteus 

 S. muttallii 

 Tivela stultorum 

 Venus mercenaria 



Wash. 

 Calif. 

 Wash. 

 Calif. 

 Wash. 

 Wash. 

 Calif. 

 Calif. 

 Canadian 

 Atlantic 



FAMILY 



Per ip lama sp. 



PERIPLOMATIDAE 



I B.C., Canada 



FAMILY LYONSIIDAE 



Mvtilimeria nuttallii Calif. 



FAMILY MYIDAE 



Mya arenaria 

 M. arenaria 

 M. arenaria 

 M. arenaria 



Maine 

 Wash. 

 Oregon 



Wash. 



FAMILY 



Panope generosa 

 Saxicava sp. 



SAXICAVIDAE 



Wash. 



Beaufort Sea 



FAMILY PHOLADIDAE 



Pholadidea penita Calif. 



P. ovoidea Calif. 



Zirfaea crispata 

 Z. pilsbryi 



N. H. 



Calif. 



39-2 



37-6 

 38-5 

 38-0 



38-6 

 37-6 

 39-4 

 38-2 

 37-3 

 38-6 

 37-8 

 38-8 



38-6 



37-9 



36-6 



38-6 

 38-7 

 38-8 

 38-3 



38-2 

 37-9 



37-0 

 38-7 

 38-3 

 39-0 



0135 



0-245 

 0-188 

 0-185 



0-180 

 0134 

 0-179 

 0-149 

 0-175 

 0-192 

 0-125 

 0-120 



0148 



0-183 



0-188 



0-246 

 0-238 

 0-181 

 0181 



0-207 

 0-196 



0-147 

 0-192 

 0-148 

 0-230 



42-7 



41-9 

 41-8 

 41-8 



42-2 

 41-6 

 41-8 

 42-0 

 42-0 

 42-3 

 42-2 

 42-0 



42-5 



42-0 



39-8 



42-2 

 42-3 

 42-3 

 42-2 



42-3 

 40-5 



41-2 



42-2 

 4I-2 

 42-5 



(I) PHYLUM MOLLUSCA, CLASS GASTROPODA 

 SUBCLASS PROSOBRANCHIA 

 ORDER ASPIDOBRANCHIA, 

 FAMILY FISSURELLIDAE 



Diodora aspera i Calif. 



Fissurella volcano j Calif. 



Megathura crenulata ' Calif. 



Megatebennus bimaculatus \ Calif. 

 C 



SUBORDER ZYGOBRANCHIA 



38-5 

 39-5 

 38-0 

 390 



0-114 

 0-108 

 0-104 

 0-117 



41-5 

 42-6 

 42-8 

 42-1 



1-93 



2-98 

 3-68 

 3-55 



07 

 20 

 30 



45 

 94 

 23 

 63 

 ■34 



2-38 



2-60 



7-63 



2-44 

 2-28 

 2-48 

 2-22 



2 03 

 4-98 



3-63 

 2-36 

 3-63 

 2-30 



3-54 

 1-86 

 2-03 



2-74 



1-57 



2-98 

 2-23 

 2-22 



2-13 

 1-63 

 2-08 

 1-78 

 214 

 2-27 

 1-52 

 1-41 



1-75 



2 20 



2-35 



2-91 

 2-81 

 2-12 

 216 



2-48 

 2-36 



1-82 

 2-27 

 1-77 

 2-70 



1-35 

 1-25 

 1-25 

 1-38 



