REPORTS ON THE COLLECTIONS OBTAINED BY ALLAN HANCOCK PACIFIC EXPEDITIONS OF 



VELERO III OFF THE COAST OF MEXICO, CENTRAL AMERICA, SOUTH AMERICA, 



AND GALAPAGOS ISLANDS IN 1932, IN 1933, IN 1934, IN 1935, 



IN 1936, IN 1937, IN 1938, in 1939, and in 1940. 



POLYCHAETOUS ANNELIDS 

 Part IV. Pectinariidae 



With a Review of All Species from the Western Hemisphere 

 (Plates 49-52) 



By OLGA HARTMAN 



