DIGENETIC TREMATODES OF FISHES FROM THE 



GALAPAGOS ISLANDS AND THE 



NEIGHBORING PACIFICf 



(Plates 32-50) 



Harold W. Manter 

 University of Nebraska 



During January, February, and March of 1934 it was the privilege 

 of the writer, aided by the Carnegie Institution of Washington, to ac- 

 company the third Allan Hancock Expedition to the Galapagos Islands. 

 A preliminary note concerning the trematode parasites collected has been 

 published (Manter, 1934a). Several papers dealing with various hel- 

 minths collected have appeared (Manter, 1937; Meserve, 1938; Cuckler, 

 1938 ; Gilbert, 1938 ; Van Cleave, in press) . The present paper deals with 

 the digenetic trematodes collected from fishes. Five hundred and thirty- 

 two fishes, including nearly one hundred different species, were examined. 

 Approximately 80 per cent of the species and 43 per cent of the individ- 

 uals harbored some kind of trematode. Meserve (1938) records 22 species 

 of Monogenea. Eighty-two species of Digenea from 80 different hosts 

 are recorded in this paper. In a number of instances the fish host was 

 unidentified or tentatively identified. A number of fishes were preserved 

 and sent to the United States National Museum, where identifications 

 were made by E. D. Reid and G. S. Myers, to whom the writer is in- 

 debted for such assistance. Fishes thus identified are indicated by an 

 asterisk (*) in the host list (p. 445). 



Type specimens of all new species described in this paper are de- 

 posited in the United States National Museum. Paratypes are deposited 

 in the Allan Hancock Foundation at The University of Southern Cali- 

 fornia. 



The trematodes were killed in formol-alcohol-acetic solution, under 

 a cover glass, with application of slight pressure. Most were stained with 

 Delafield's hematoxylin. Serial sections were made of most species. 



Descriptions of new genera and species are written in the form of 

 diagnoses that are intended to be sufficiently complete to serve as fairly 

 adequate descriptions. It will be more or less evident that the host dis- 

 tribution and the geographical distribution of these trematodes are of 



t Studies from the Zoological Laboratories, University of Nebraska, No. 203. 



[329] /(^^^^^ ^^ 



/■Co 



