No. 5 meserve: monogenetic trematodes 71 



SUMMARY AND CONCLUSIONS 



A study was made of twenty-two species of Monogenea collected 

 from the gills of marine fish by Dr. H, W. Manter from the Gala- 

 pagos Islands, the Pacific Coast of South America, Central America, 

 and Mexico, including some adjacent islands. 



Twenty new species are described. All are placed in known gen- 

 era with one exception. Two previously described species, Encotyl- 

 labe pagrosomi MacCallum and Axine aberrans Goto, are reported 

 from new localities. 



One new genus is proposed: Cestracolpa, which has a character- 

 istic lateral vaginal opening and a spine imbedded in the wall of 

 the distal end of the vagina. 



New species are described in the following genera: Benedenia, 

 Entobdella, Heterobothrium, Diclidophora, Microcotyle, Gotocotyla, 

 Thoracocotyle, Axine, Pseudaxine, Protomicrocotyle, and Cestracolpa. 



Previously undescribed structures surrounding the genital pore 

 of Cestracolpa cypseluri and C. yamagutii are described and the 

 name giant cells proposed for them. 



The name glands of Goto is proposed for posttesticular glands 

 first described by Goto and called different names by various authors. 

 They are considered of taxonomic significance. 



The fact that related species of ectoparasitic trematodes live 

 on related hosts is pointed out. For example, two species of Cestra- 

 colpa were collected, both from flying fish. The twenty-two species 

 described in this paper were each found on only one specific host 

 although over five hundred fish representing approximately one hun- 

 dred species were examined. 





