336 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



Discussion. — A single specimen was collected from each of the 

 above hosts. Sucker ratio in this species is rather variable. The 

 specimen from Porichthys has approximately a 1 :2 ratio rather 

 than the more usual 1 :2.5 to 3. However, a 1 :2 ratio occurs in 

 Atlantic specimens from Ogcocephalus radiatus, Micropogon un-\ 

 dulatus, and Calamus bajonado. This trematode is very common 

 at Tortugas, Fla., where it has numerous hosts, and it is known 

 also from North Carolina and Massachusetts. This record is the 

 first from the Pacific. 



Genus ELYTROPHALLUS Manter, 1940 



ELYTROPHALLUS MEXICANUS Manter, 1940 



Host. — Paralabrax clathratus (Girard)/° kelp bass. 



Location. — Intestine. 



Number. — Two. 



Discussion. — This species was found to be common in a variety 

 of fishes of Socorro and Clarion Islands (Mexico) and less common 

 in the Galapagos Islands (Manter, 1940). The trematode is nor- 

 mally a stomach parasite. 



In the following list of fishes the species are arranged by families 

 in the sequence followed in the Jordan, Evermann, and Clark 

 checklist (1930). 



HOST LIST 



CYPRiNODONTroAE: Killifishes 



Fundulus parvipinnis parvipinnis Girard, southern California killifish: 

 Phyllodistomum sp. 



Bothidab: Sinistral Flatfishes 



Paralichthys calif ornicus (Ayres), California halibut: 

 Bucephalopsis labiatiis, new species. 

 Stephanostomum denatum (Linton, 1900). 

 Immature hemiurid. 

 Immature Distomum fene stratum. 



Serranidae: Sea Basses 



Mycteroperca pardalis Gilbert: 



Lepidapedon sp. 

 Paralabrax clathratus (Girard), kelp bass: 



Elytrophallu^ mexicanus Manter, 1940. 



Plagioporus isaitschikowi (Layman, 1930). 



Haemulidae: Grunts 



Anisotremus davidsonii (Steindachner), California sargo: 

 Brachadena pyriformis Linton, 1910 

 Proctotrema longicaecum Manter, 1940 



10 Ne^ host record. 



