26 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
Venericardia (Cyclocardia) borealis (Conrad). 
Cardita borealis , Gould, ’70, p. 146. 
Abundant, large specimens dredged on hard bottom at stations 7, 
8, 9, 10. The adult specimens were much more elevated in shape 
than the young. 
Venericardia (Cyclocardia) novangliae (Morse). 
Cyclocardia novangliae Morse, ’69, p. 76. 
Not as common as the preceding with which it is found and from 
which it is readily distinguished by its much finer sculpture and 
character of hinge margins. 
Astarte castanea (Say). 
Rather rare, a few specimens dredged at station 17. 
Astarte undata Gould. 
Astarte sulcata , Gould (not DaCosta), ’70, p. 119. 
Astarte undata Gould, ’70, p. 121. 
Very common, though of small size, at station 7. Full grown 
specimens common in deeper water at station 17. Quantities of 
dead shells of large size at station 11. 
Astarte undata var. latisulca (Hanley). 
Astarte undata var. latisulca, Dali, : 03, p. 938. 
Common with the preceding. 
Astarte subaequilatera Sowerby. 
Astarte crebricostata , Gould, '70, p. 126. 
Astarte lens, Dali, : 03, p. 939. 
Rather common, hard bottom, stations 17, 22. 
Astarte borealis Schumacher. 
Astarte semisulcata , Gould, ’70, p. 121. 
Rare, only valves dredged at station 17. 
Note. — This and the following species are placed in section 
Tridonta Schuin. by Dali. This species is the type. 
Astarte banksii Leach. 
Rare, only valves dredged, station 24. This is an Arctic American 
species. 
