708 PROCEEDINGS OF THE ACADEMY OF [Nov., 



Venericardia Cuvieri Broderip, 1832. 



Gulf of Fonseca, iu 11 fathoms, 7 miles off shore, Cuming; 

 and south to Panama. 



G. michelini Valenciennes, 1846, is synonymous. This fine 

 species with heavy crenate ribs can hardly be mistaken for any 

 other. It appears to be exceptionally rare. 



Venericardia (Cyclocardia) spurca Sowerby, 1832. 



Iquique, Peru, and southward to Ihe west coast of Patagonia, 

 in 61 fathoms, bottom temperature 54° F. 



An inflated rotund species with about 20 narrow beaded ribs, 

 with wider interspaces and covered with an olivaceous gray perios- 

 tracum. 



Venericardia (Cyclocardia) velutina Smith, 1881. 



Port Rosario and Wolsey anchorage, 17 to 30 fathoms, sand and 

 rock. Smith ; west coast of Patagonia and Magellan Straits, in 77 

 to 369 fathoms, mud, bottom temperature 46° to 48° F. ; U. S. 

 Fish Commission steamer "Albatross." 



Much like V. spurca, but a thinner and lighter shell more deli- 

 cately sculptured, with a larger and longer lunule and a very much 

 more delicate hinge. It has about 20 ribs. 



Venericardia (Cyclocardia) compressa Reeve, 1843. 



Valparaiso, Chile; Portland Bay, West Patagonia, and in 20 

 fathoms, stony and shelly bottom, Boija Bay, Smith. 



I have not seen this species, but from the figures it must be close 

 to Gould's V. procera, and if the species extends in the cold water 

 on both coasts of the southern part of South America, as some 

 others do, they may be identical, and in that case Reeve's name 

 has precedence. 



Venericardia (Cyclocardia) barbarensis Stearns, 1890. 



Station 2,840, in the Santa Barbara Channel, in green mud, at 

 the depth of 276 fathoms, and at Station 2,909, in 205 fathoms, 

 bottom temperature 45.2° F. ; U. S. Fish Commission steamer 

 " Albatross." 



Shell very thiu and delicate, with about twenty low ribs, slightly 

 granular in the young and becoming obsolete distally in the adult, 

 the lunule small and obscure. 



