542 



ALLAN HANCOCK PACIFIC EXPEDITIONS 



VOL. 2 



TABLE 6 



Distribution of Nonendemic Galapagos Species 



A. Galapagos trematodes occurring also at Tortugas or the tropical American 

 Atlantic 



(* = occurring elsewhere only at Tortugas) 



Species 



Localities (other than Galapagos) 



1. Derogenes 'varicus 



2. Hamacreadiurn mutabile* 



3. Hamacreadium oscitans* 



4. Haplosplanchnus acutus 



5. Haplosplanchnus 



pomacentrus* 



6. Hirudinella beebei 



7. Hirudinella clavata 



8. Lecithochirium 



microstomujn* 



9. Proctotrema longicaecum* 

 10. Prosorhynchus ozakii 



Tortugas and many parts of the world 

 Tortugas, Florida 

 Tortugas, Florida 

 Tortugas, Florida; Colombia 



Tortugas, Florida 



Bermuda; Panama; Gulf of Mexico 



American Atlantic; probably elsewhere 



Gulf of Mexico 



Tortugas, Florida 



Tortugas, Florida; Mexican Pacific 



B. 



Galapagos trematodes occurring also along the Pacific coast of Mexico 

 (* ^ occurring elsewhere only along Mexican coast) 



1. Coitocaecum tropicum 



2. Elytrophallus mexicanus* 



3. Opechona orientalis 



4. Prosorhynchus ozakii 



5. Pseudocreadium 



scaphosomum* 



6. Stephanostomum 



multispinosum* 



Socorro Island ; Colombia 

 Socorro and Clarion islands 

 Clarion Island ; Peter the Great Bay 

 Isabel Island ; Tortugas, Florida 



Isabel Island 



Clarion Island 



Galapagos trematodes occurring also along the Pacific coast of South America 

 (* = occurring elsewhere only along coast of South America) 



1. Coitocaecum tropicum Colombia; Socorro Island, Mexico 



2. Bianium adplicatum* Ecuador 



3. Haplosplanchnus acutus Colombia ; Tortugas, Florida 



One species, Prosorhynchus aculeatus, is known only from Europe; 

 one species, Opegaster parapristipomatis , is known only from Japan. 



These nonendemic species from the Galapagos suggest the same con- 

 dition indicated by the endemic species except that similarity to Japanese 

 waters is not so evident. The Tortugas region continues to be the most 

 similar. 



Since the same number of fishes was examined from the Pacific coast 

 of South America as from the Galapagos Islands, it might be of some 



