32 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



No new methods of technique were used. The animals were killed 

 in formol-alcohol-acetic acid solution (formalin 6^ parts, 50 per 

 cent alcohol 100 parts, glacial acetic acid 2^^ parts) under a cover 

 glass to flatten the specimen. After several hours the killing solution 

 was removed and the specimens were preserved in 70 per cent 

 alcohol. Specimens were stained in Delafield's haematoxylin. Some 

 were counterstained with orange G, eosin, or erythrosin. Serial sec- 

 tions were made except where there were few specimens. Toto 

 mounts were cleared in cedar oil and serial sections in xylol. All were 

 mounted in balsam. 



Identification of fish hosts of these trematodes is often incom- 

 plete. Unless otherwise indicated the fishes were indentified by H. 

 W. Manter and Dr. Waldo Schmitt. Because no specialist on fishes 

 was available at the time of collecting, these identifications cannot 

 be considered as authoritative. However, an identification thus made 

 is used only after reasonable satisfaction that it is correct. Some 

 specimens, especially of the smaller fishes, were sent to the United 

 States National Museum and kindly identified by Dr. G. S. Myers. 

 These identifications are indicated in the text. The names of all fish 

 hosts, as far as identified, are as listed in Jordan, Evermann and 

 Clark's checklist (1930). 



Types of all new species will be deposited in the United States 

 National Museum at Washington, D. C. Paratypes will be located 

 at The University of Southern California. 



The recent comprehensive studies of Price (1937, 1937a) on the 

 Monogenea make extensive history and bibliographies unnecessary. 

 The descriptions in this paper are condensed to serve as specific 

 diagnoses. 



Family: CAPSALIDAE Baird, 1853 



Subfamily: Benedeniinae Johnston, 1931 



Monticelli (1903) in a revision of the genus Epibdella Blain- 

 ville, 1827* divided it into those with true suckers, subgenus Bene- 

 denia Odhner, 1905 and those with pseudosuckers, subgenus Phylline 



* "The date 1828 is usually quoted, but Sherborn (Index Animalium, pt. ix., 

 1926, p. 2169) recorded the genus as having been published by Blainville in Diet. 

 Sci. Nat., vol. xlvii., 1827, p. 269, and in vol. Ivii., 1828, p. 567."— [from Johnston 

 (1929)]. 



